0001047862-24-000012 | 10-K | XBRL Viewer

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Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Dec. 31, 2023 MWh MW MMBTU gal
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount \| MWh	34,892,535
Capacity
Derivatives, Fair Value [Line Items]
Notional amount \| MW	44,400
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount \| MMBTU	325,690,000
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount \| gal	3,780,000
CECONY \| Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount \| MWh	32,315,225
CECONY \| Capacity
Derivatives, Fair Value [Line Items]
Notional amount \| MW	34,500
CECONY \| Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount \| MMBTU	306,700,000
CECONY \| Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount \| gal	3,780,000

Stock-Based Compensation - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employer contribution match (up to)	$ 1
Amount employee contribution for employer match	9
Maximum employee investment per year (up to)	$ 25,000
Maximum percentage allowed to invest (not more than)	20.00%
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock received upon vesting (in shares)	1
Compensation expense to be recognized	$ 38,000,000
Nonvested awards, compensation cost not yet recognized, period for recognition (years)	1 year
Payment for settlement of vested units	$ 21,000,000	$ 10,000,000	$ 8,000,000
Performance RSUs \| CECONY
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense to be recognized	$ 34,000,000
Nonvested awards, compensation cost not yet recognized, period for recognition (years)	1 year
Payment for settlement of vested units	$ 19,000,000	9,000,000	7,000,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Time-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense to be recognized	$ 12,000,000
Nonvested awards, compensation cost not yet recognized, period for recognition (years)	2 years
Payment for settlement of vested units	$ 2,000,000	2,000,000	1,000,000
Weighted average grant date price per share (in dollars per share)	$ 92.93
Time-based Awards \| CECONY
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense to be recognized	$ 12,000,000
Nonvested awards, compensation cost not yet recognized, period for recognition (years)	2 years
Payment for settlement of vested units	$ 2,000,000	$ 2,000,000	$ 1,000,000
Weighted average grant date price per share (in dollars per share)	$ 93.38
2013 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock that can be awarded under the plan	10,000,000
TSR Portion \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustment percentage used for Performance awards	50.00%
Factor used for adjustment of Performance awards, low end (percent)	0.00%
Factor used for adjustment of Performance awards, high end (percent)	200.00%
Weighted average grant date price per share (in dollars per share)	$ 91.93
TSR Portion \| Performance RSUs \| CECONY
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date price per share (in dollars per share)	$ 92.27
Non-TSR Portion \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustment percentage used for Performance awards	50.00%
Factor used for adjustment of Performance awards, low end (percent)	0.00%
Factor used for adjustment of Performance awards, high end (percent)	200.00%
Weighted average grant date price per share (in dollars per share)	$ 90.93
Non-TSR Portion \| Performance RSUs \| CECONY
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date price per share (in dollars per share)	$ 91.34
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units issued (in shares)	29,000
Weighted average grant date price per share (in dollars per share)	$ 94.78
Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased on the open market	751,702	744,932	957,866
Weighted average share price per share, on shares purchased on open market (in dollars per share)	$ 91.80	$ 91.59	$ 73.38

Material Contingencies - Manhattan Explosion and Fire (Details) $ in Millions		1 Months Ended
	Mar. 12, 2014 building people	Feb. 28, 2017 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 5,328	$ 6,027
Manhattan Explosion and Fire
Loss Contingencies [Line Items]
Number of buildings destroyed by fire \| building	2
Number of people died in explosion and fire incident \| people	8
Number of people injured in explosion and fire incident (more than) \| people	50
Amount of costs that will not recover from customers		$ 126
Loss contingency accrual			40		$ 40
Insurance receivable			$ 40		$ 40
Manhattan Explosion and Fire \| Settlement of gas proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability		$ 27

Stock-Based Compensation - Summary of Changes in Status of Performance RSUs' (Details) - Performance RSUs	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Units
Non-vested at beginning of period (in shares) \| shares	865,091
Granted (in shares) \| shares	266,200
Vested (in shares) \| shares	(264,568)
Forfeited (in shares) \| shares	(28,420)
Non-vested at end of period (in shares) \| shares	838,303
CECONY
Units
Non-vested at beginning of period (in shares) \| shares	647,826
Granted (in shares) \| shares	204,466
Vested (in shares) \| shares	(205,078)
Forfeited (in shares) \| shares	(8,741)
Non-vested at end of period (in shares) \| shares	638,473
TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 80.02
Granted (in dollars per share)	91.93
Vested (in dollars per share)	79.69
Forfeited (in dollars per share)	86.23
Non-vested at end of period (in dollars per share)	$ 83.70
Adjustment percentage used for Performance awards	50.00%
TSR Portion \| CECONY
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 79.89
Granted (in dollars per share)	92.27
Vested (in dollars per share)	79.40
Forfeited (in dollars per share)	85.24
Non-vested at end of period (in dollars per share)	83.94
Non-TSR Portion
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	80.04
Granted (in dollars per share)	90.93
Vested (in dollars per share)	89.62
Forfeited (in dollars per share)	82.22
Non-vested at end of period (in dollars per share)	$ 80.40
Adjustment percentage used for Performance awards	50.00%
Non-TSR Portion \| CECONY
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 80.16
Granted (in dollars per share)	91.34
Vested (in dollars per share)	88.75
Forfeited (in dollars per share)	81.02
Non-vested at end of period (in dollars per share)	$ 80.97

Environmental Matters - Additional Information (Details) - Superfund Sites $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Site Contingency [Line Items]
Remediation cost estimate	$ 62
Manufactured Gas Plant Sites \| Maximum
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)	3,295
CECONY
Site Contingency [Line Items]
Remediation cost estimate	60
CECONY \| Manufactured Gas Plant Sites \| Maximum
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)	$ 3,440

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Schedule Of Income (Loss), Hypothetical Liquidation At Book Value

The HLBV method of accounting resulted in income/(loss) for Con Edison and the tax equity investors for the years ended December 31, 2022 and 2021 as shown in the table below. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.


	2022		2021
(Millions of Dollars)	CED Nevada Virginia	Tax Equity Projects	CED Nevada Virginia	Tax Equity Projects
Tax equity investor	$(49)	$(11)	$(158)	$6
After tax	(37)	(8)	(119)	4
Con Edison	41	51	155	30
After tax	31	38	117	24

Schedule of Business Acquisitions, by Acquisition

At December 31, 2022, Con Edison’s consolidated balance sheet included the following amounts associated with its consolidated VIEs:


	Tax Equity Projects
	Great Valley Solar (c)(d)	Copper Mountain - Mesquite Solar (c)(e)	CED Nevada Virginia (c)(f)
(Millions of Dollars)	2022	2022	2022
Assets held for sale (a)	$305	$580	$686


Total assets (a)	$305	$580	$686
Liabilities held for sale (b)	$20	$81	$331

Total liabilities (b)	$20	$81	$331

(a)The assets of the Tax Equity Projects and CED Nevada Virginia represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE. Amounts shown for 2022 are included in current assets held for sale on Con Edison's consolidated balance sheet as of December 31, 2022. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X. For the disposal of the noncontrolling interest, see Con Edison's Consolidated Statement of Equity.

(b)The liabilities of the Tax Equity Projects and CED Nevada Virginia represent liabilities of a consolidated VIE for which creditors do not have recourse to the general credit of the primary beneficiary. Amounts shown for 2022 are included in current liabilities held for sale on Con Edison's consolidated balance sheet as of December 31, 2022. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X. For the disposal of the noncontrolling interest, see Con Edison's Consolidated Statement of Equity.

(c)Con Edison did not provide any financial or other support during the year that was not previously contractually required.

(d)Great Valley Solar consists of the Great Valley Solar 1, Great Valley Solar 2, Great Valley Solar 3 and Great Valley Solar 4 projects, for which the noncontrolling interest of the tax equity investor was $67 million at December 31, 2022.

(e)Copper Mountain - Mesquite Solar consists of the Copper Mountain Solar 4, Mesquite Solar 2 and Mesquite Solar 3 projects for which the noncontrolling interest of the tax equity investor was $94 million at December 31, 2022.

(f)CED Nevada Virginia consists of the Copper Mountain Solar 5, Battle Mountain Solar and Water Strider Solar projects for which the noncontrolling interest of the tax equity investor was $39 million at December 31, 2022.

Material Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Material Contingencies

Manhattan Explosion and Fire

On March 12, 2014, two multi-use five-story tall buildings located on Park Avenue between 116th and 117th Streets in Manhattan were destroyed by an explosion and fire. CECONY had delivered gas to the buildings through service lines from a distribution main located below ground on Park Avenue. Eight people died and more than 50 people were injured. Additional buildings were also damaged. The National Transportation Safety Board (NTSB) investigated. The parties to the investigation included CECONY, the City of New York, the Pipeline and Hazardous Materials Safety Administration and the NYSPSC. In June 2015, the NTSB issued a final report concerning the incident, its probable cause and safety recommendations. The NTSB determined that the probable cause of the incident was (1) the failure of a defective fusion joint at a service tee (which joined a plastic service line to a plastic distribution main) installed by CECONY that allowed gas to leak from the distribution main and migrate into a building where it ignited and (2) a breach in a city sewer line that allowed groundwater and soil to flow into the sewer, resulting in a loss of support for the distribution main, that caused it to sag and overstressed the defective fusion joint. The NTSB also made safety recommendations, including recommendations to CECONY that addressed its procedures for the preparation and examination of plastic fusions, training of its staff on conditions for notifications to the city’s Fire Department and extension of its gas main isolation valve installation program. In February 2017, the NYSPSC approved a settlement agreement with CECONY related to the NYSPSC's investigations of the incident and the practices of qualifying persons to perform plastic fusions. Pursuant to the agreement, CECONY provided $27 million of future benefits to customers (for which it accrued a regulatory liability) and did not recover from customers $126 million of costs for gas emergency response activities that it had previously incurred and expensed. Lawsuits are pending against CECONY seeking generally unspecified damages and, in some cases, punitive damages, for wrongful death, personal injury, property damage and business interruption. CECONY notified its insurers of the incident and believes that the policies in force at the time of the incident will cover CECONY's costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have for damages in connection with the incident. During 2020, CECONY accrued its estimated liability for the suits of $40 million and an insurance receivable in the same amount, and such estimated liability and receivable did not change as of December 31, 2023.

Other Contingencies

For additional contingencies, see “Other Regulatory Matters” in Note B, Note G and "Uncertain Tax Positions" in Note L.

Guarantees

Con Edison and its subsidiaries have entered into various agreements providing financial or performance assurance primarily to third parties on behalf of their subsidiaries. In addition, Con Edison has provided guarantees to third parties on behalf of the Clean Energy Businesses, that are in the process of being transferred to the buyer of the Clean Energy Businesses, RWE Aktiengesellschaft (RWE). Maximum amounts guaranteed by Con Edison and its subsidiaries under these agreements totaled $175 million and $2,412 million at December 31, 2023 and 2022, respectively.

A summary, by type and term, of Con Edison’s total guarantees under these other agreements at December 31, 2023 is as follows:


Guarantee Type	0 – 3 years	4 – 10 years	> 10 years	Total
	(Millions of Dollars)
Con Edison Transmission	$76	$—	$—	$76
Guarantees on behalf of the Clean Energy Businesses(a)	58	—	32	90
Broken Bow II	—	—	9	9
Total	$134	$—	$41	$175

(a) On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X. Guarantee amount shown represents guarantees issued on behalf of the Clean Energy Businesses that remain outstanding at December 31, 2023. Prior to and following the sale, RWE, with Con Edison's assistance, engaged in the process of transferring responsibility for these guarantees from Con Edison to RWE and that process is ongoing. Pursuant to the purchase and sale agreement, RWE is obligated to reimburse and hold harmless Con Edison for any payments Con Edison makes under guarantees issued by Con Edison on behalf of the Clean Energy Businesses. As of December 31, 2023, no such payments have been, or are probable of being, made.

Con Edison Transmission – Con Edison has guaranteed payment by Con Edison Transmission of the contributions Con Edison Transmission agreed to make to New York Transco LLC (New York Transco). Con Edison

Transmission owns a 45.7 percent interest in New York Transco's New York Energy Solution project, the majority of which has been completed. Guarantee amount shown includes the maximum possible required amount of Con Edison Transmission's contributions for the remainder of this project as calculated based on the assumptions that the project is completed at 175 percent of its estimated remaining costs and New York Transco does not use any debt financing for the project.

Broken Bow II — Con Edison has guaranteed obligations on behalf of Broken Bow II associated with its investment in a wind energy facility. Broken Bow II is held for sale as of December 31, 2023. See Note X.

Consolidated Statement of Capitalization - Long-term Debt - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Schedule of Capitalization, Long-term Debt [Line Items]

Other long-term debt

$ 0

$ (1)

Unamortized debt expense

(162)

(172)

Unamortized debt discount

(60)

(51)

TOTAL

22,240

23,441

Less: Long-term debt due within one year

251

1,002

TOTAL LONG-TERM DEBT

21,989

22,439

Less: Held for sale project debt, net

2,292

TOTAL LONG-TERM DEBT EXCLUDING HELD FOR SALE

21,927

20,147

TOTAL CAPITALIZATION

$ 43,085

40,834

Copper Mountain Solar 2

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[1]

6.91%

TOTAL PROJECT DEBT

$ 0

179

Copper Mountain Solar 3

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[1]

6.91%

TOTAL PROJECT DEBT

$ 0

229

CED Southwest

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[1]

5.92%

TOTAL PROJECT DEBT

$ 0

408

Wind Holdings

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.41%

TOTAL PROJECT DEBT

$ 0

Copper Mountain Solar 1

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[1]

6.48%

TOTAL PROJECT DEBT

$ 0

CED California Texas

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[1]

6.42%

TOTAL PROJECT DEBT

$ 0

236

Mesquite Solar 1

Schedule of Capitalization, Long-term Debt [Line Items]

TOTAL PROJECT DEBT

$ 0

149

Mesquite Solar 1 | Minimum

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[2]

2.24%

Mesquite Solar 1 | Maximum

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[2]

3.03%

Texas Solar 4

Schedule of Capitalization, Long-term Debt [Line Items]

TOTAL PROJECT DEBT

$ 0

Texas Solar 4 | Minimum

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[2]

5.25%

Texas Solar 4 | Maximum

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[2]

4.95%

California Solar 2

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.94%

TOTAL PROJECT DEBT

$ 0

California Solar 3

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.07%

TOTAL PROJECT DEBT

$ 0

California Solar

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.78%

TOTAL PROJECT DEBT

$ 0

168

California Solar 4

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.82%

TOTAL PROJECT DEBT

$ 0

265

Broken Bow II

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.82%

TOTAL PROJECT DEBT

$ 62

Texas Solar 5

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.53%

TOTAL PROJECT DEBT

$ 0

132

Texas Solar 7

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.21%

TOTAL PROJECT DEBT

$ 0

180

Upton County Solar

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.45%

TOTAL PROJECT DEBT

$ 0

CED Nevada Virginia

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.77%

TOTAL PROJECT DEBT

$ 0

228

Other project debt

Schedule of Capitalization, Long-term Debt [Line Items]

TOTAL PROJECT DEBT

Project Debt

Schedule of Capitalization, Long-term Debt [Line Items]

TOTAL PROJECT DEBT

2,665

Debentures

Schedule of Capitalization, Long-term Debt [Line Items]

TOTAL

$ 21,950

20,550

Debentures | Debenture 2020A, 0.65 Percent, Due 2023

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

0.65%

TOTAL

$ 0

650

Debentures | Debenture 2014B, 3.30 Percent, Due 2024

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.30%

TOTAL

$ 250

250

Debentures | Debenture Series 2016B, 2.90% Due 2026

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

2.90%

TOTAL

$ 250

250

Debentures | Debenture Series 1997F, 6.50% Due 2027

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

6.50%

TOTAL

$ 80

Debentures | Debenture Series 2017B, 3.125% Due 2027

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.125%

TOTAL

$ 350

350

Debentures | Debenture Series 2018A, 3.80% Due 2028

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.80%

TOTAL

$ 300

300

Debentures | Debenture Series 2018D, 4.00% Due 2028

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.00%

TOTAL

$ 500

500

Debentures | Debenture 2019B, 2.94 Percent, Due 2029

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

2.94%

TOTAL

$ 44

Debentures | Debenture 2020A, 3.35 Percent, Due 2030

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.35%

TOTAL

$ 600

600

Debentures | Debenture 2020A, 2.02 Percent, Due 2030

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

2.02%

TOTAL

$ 35

Debentures | Debenture 2021A, 2.40 Percent, Due 2031

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

2.40%

TOTAL

$ 900

900

Debentures | Debenture 2021A, 2.31 Percent, Due 2031

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

2.31%

TOTAL

$ 45

Debentures | Debenture 2022A, 5.70 Percent, Due 2032

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.70%

TOTAL

$ 100

100

Debentures | Debenture Series 2003A, 5.875% Due 2033

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.875%

TOTAL

$ 175

175

Debentures | Debenture Series 2003C, 5.10% Due 2033

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.10%

TOTAL

$ 200

200

Debentures | Debenture Series 2023A, 5.20% Due 2033

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.20%

TOTAL

$ 500

Debentures | Debenture Series 2004B, 5.70% Due 2034

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.70%

TOTAL

$ 200

200

Debentures | Debenture Series 2023B, 5.50% Due 2034

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.50%

TOTAL

$ 600

Debentures | Debenture Series 2005A, 5.30% Due 2035

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.30%

TOTAL

$ 350

350

Debentures | Debenture Series 2005B, 5.25% Due 2035

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.25%

TOTAL

$ 125

125

Debentures | Debenture Series 2006A, 5.85% Due 2036

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.85%

TOTAL

$ 400

400

Debentures | Debenture Series 2006B, 6.20% Due 2036

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

6.20%

TOTAL

$ 400

400

Debentures | Debenture Series 2006E, 5.70% Due 2036

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.70%

TOTAL

$ 250

250

Debentures | Debenture Series 2007A, 6.30% Due 2037

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

6.30%

TOTAL

$ 525

525

Debentures | Debenture 2008B, 6.75 Percent, Due 2038

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

6.75%

TOTAL

$ 600

600

Debentures | Debenture 2009B, 6.00 Percent, Due 2039

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

6.00%

TOTAL

$ 60

Debentures | Debenture 2009C, 5.50 Percent, Due 2039

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.50%

TOTAL

$ 600

600

Debentures | Debenture 2019C, 3.46 Percent, Due 2039

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.46%

TOTAL

$ 38

Debentures | Debenture 2010B, 5.70 Percent, Due 2040

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.70%

TOTAL

$ 350

350

Debentures | Debenture 2010B, 5.50 Percent, Due 2040

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.50%

TOTAL

$ 115

115

Debentures | Debenture 2012A, 4.20 Percent, Due 2042

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.20%

TOTAL

$ 400

400

Debentures | Debenture 2013A, 3.95 Percent, Due 2043

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.95%

TOTAL

$ 700

700

Debentures | Debenture 2014A, 4.45 Percent, Due 2044

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.45%

TOTAL

$ 850

850

Debentures | Debenture 2015A, 4.50 Percent, Due 2045

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.50%

TOTAL

$ 650

650

Debentures | Debenture 2015A, 4.95 Percent, Due 2045

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.95%

TOTAL

$ 120

120

Debentures | Debenture Series 2015B, 4.69% due 2045

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.69%

TOTAL

$ 100

100

Debentures | Debenture 2016A, 3.85 Percent, Due 2046

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.85%

TOTAL

$ 550

550

Debentures | Debenture Series 2016A. 3.88% Due 2046

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.88%

TOTAL

$ 75

Debentures | Debenture Series 2017A, 3.875% Due 2047

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.875%

TOTAL

$ 500

500

Debentures | Debenture Series 2018E, 4.65% Due 2048

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.65%

TOTAL

$ 600

600

Debentures | Debenture Series 2018A, 4.35% Due 2048

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.35%

TOTAL

$ 125

125

Debentures | Debenture Series 2018B, 4.35% Due 2048

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.35%

TOTAL

$ 25

Debentures | Debenture 2019A, 4.125 Percent, Due 2049

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.125%

TOTAL

$ 700

700

Debentures | Debenture 2019A, 3.73 Percent, Due 2049

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.73%

TOTAL

$ 43

Debentures | Debenture 2020B, 3.95 Percent, Due 2050

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.95%

TOTAL

$ 1,000

1,000

Debentures | Debenture 2020B, 3.24 Percent, Due 2050

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.24%

TOTAL

$ 40

Debentures | Debenture 2021B, 3.170 Percent, Due 2051

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.17%

TOTAL

$ 30

Debentures | Debenture 2021C, 3.20 Percent, Due 2051

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.20%

TOTAL

$ 600

600

Debentures | Debenture 2022A, 6.15%, Due 2052

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

6.15%

TOTAL

$ 700

700

Debentures | Debenture 2023C, 5.90%, Due 2053

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

5.90%

TOTAL

$ 900

Debentures | Debenture 2023A, 6.59%, Due 2053

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

659.00%

TOTAL

$ 50

Debentures | Debenture Series 2014C, 4.625% Due 2054

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.625%

TOTAL

$ 750

750

Debentures | Debenture Series 2016C, 4.30% Due 2056

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.30%

TOTAL

$ 500

500

Debentures | Debenture Series 2017C, 4.00% Due 2057

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.00%

TOTAL

$ 350

350

Debentures | Debenture Series 2018B, 4.50% Due 2058

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

4.50%

TOTAL

$ 700

700

Debentures | Debenture 2019B, 3.70 Percent, Due 2059

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.70%

TOTAL

$ 600

600

Debentures | Debenture 2020C, 3.00 Percent, Due 2060

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.00%

TOTAL

$ 600

600

Debentures | Debenture 2021B, 3.60 Percent, Due 2061

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

3.60%

TOTAL

$ 750

750

Tax-Exempt Debt

Schedule of Capitalization, Long-term Debt [Line Items]

TOTAL PROJECT DEBT

$ 450

450

Tax-Exempt Debt | Tax Exempt Debt Series 2010A Due 2036

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[3]

3.92%

TOTAL PROJECT DEBT

$ 225

225

Tax-Exempt Debt | Tax Exempt Debt Series 2004C, 1.663% Due 2039

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[3]

3.83%

TOTAL PROJECT DEBT

$ 99

Tax-Exempt Debt | Tax-Exempt Debt Series 2005A, 1.627% Due 2039

Schedule of Capitalization, Long-term Debt [Line Items]

Interest Rate

^[3]

3.80%

TOTAL PROJECT DEBT

$ 126

[1]	(c) March 1, 2023 effective rates shown, reflecting variable interest rates on the debt that are reset quarterly or semi-annually. Refer to Note Q for the effect of applicable interest rate swaps.
[2]	(d) Range of rates shown reflect multiple tranches associated with the debt.
[3]	Rates reset weekly; December 31, 2023 rates shown.

Other Postretirement Benefits - Schedule of Plan Assets Allocations (Details) - Other Postretirement Benefits - CECONY	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	100.00%
Plan Assets Percentage (percent)	100.00%	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets Percentage (percent)	44.00%	49.00%	55.00%
Equity Securities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	35.00%
Equity Securities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	55.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets Percentage (percent)	51.00%	51.00%	45.00%
Debt Securities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	40.00%
Debt Securities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	60.00%
Real Estate and Other Alternatives
Defined Benefit Plan Disclosure [Line Items]
Plan Assets Percentage (percent)	5.00%	0.00%	0.00%
Real Estate and Other Alternatives \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	0.00%
Real Estate and Other Alternatives \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Range (percent)	9.00%

Current Expected Credit Losses (Tables)

12 Months Ended

Dec. 31, 2023

Credit Loss [Abstract]

Rollforward of Allowance for Credit Losses

The table below presents a rollforward by major portfolio segment type for the years ended December 31, 2023, 2022 and 2021:


	For the Year Ended December 31,
	Con Edison						CECONY
	Accounts receivable - customers			Other receivables			Accounts receivable - customers			Other receivables
(Millions of Dollars)	2023	2022	2021	2023	2022	2021	2023	2022	2021	2023	2022	2021
Allowance for credit losses
Beginning Balance at January 1,	$322	$317	$148	$10	$22	$7	$314	$304	$138	$7	$19	$4
Recoveries	14	17	14	—	—	1	12	16	12	—	—	1
Write-offs	(138)	(103)	(91)	(5)	(6)	(2)	(131)	(94)	(86)	(3)	(4)	(1)
Reserve adjustments	162	91	246	8	(6)	16	158	88	240	5	(8)	15
Ending Balance December 31,	$360	$322	$317	$13	$10	$22	$353	$314	$304	$9	$7	$19

Held-for-Sale Treatment of the Clean Energy Businesses - Schedule of Carrying Amounts (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS
TOTAL CURRENT ASSETS	$ 163	$ 7,162
Non-utility property, net accumulated depreciation	13	13
CURRENT LIABILITIES
TOTAL CURRENT LIABILITIES	76	3,610
Disposal Group, Held-for-sale, Not Discontinued Operations \| Clean Energy Businesses
CURRENT ASSETS
Cash and temporary cash investments	0	25
Accounts receivable and other receivables - net allowance for uncollectible accounts	1	319
Accrued unbilled revenue	1	51
Fuel oil, gas in storage, materials and supplies, at average cost	0	56
Restricted cash	5	223
Fair value of derivatives assets	0	84
Prepayments	0	35
Other current assets	1	24
TOTAL CURRENT ASSETS	8	817
Non-utility property, net accumulated depreciation	76	4,197
Construction work in progress	0	522
NET PLANT	76	4,719
OTHER NONCURRENT ASSETS
Goodwill	0	31
Intangible assets, less accumulated amortization	72	1,222
Operating lease right-of-use asset	7	266
Fair value of derivatives assets	0	93
Other deferred charges and noncurrent assets	0	14
TOTAL OTHER NONCURRENT ASSETS	79	1,626
TOTAL ASSETS	163	7,162
CURRENT LIABILITIES
Long-term debt due within one year	2	353
Term loan	0	150
Accounts payable	0	326
Operating lease liabilities	2	33
Accrued Interest	0	40
Other current liabilities	4	71
TOTAL CURRENT LIABILITIES	8	973
NONCURRENT LIABILITIES
Asset retirement obligations	3	77
Operating lease liabilities	5	248
Other deferred credits and noncurrent liabilities	0	20
TOTAL NONCURRENT LIABILITIES	8	345
LONG-TERM DEBT	60	2,292
TOTAL LIABILITIES	$ 76	$ 3,610

Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	1-14514
Entity Registrant Name	Consolidated Edison, Inc.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	13-3965100
Entity Address, Address Line One	4 Irving Place,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10003
City Area Code	(212)
Local Phone Number	460-4600
Title of 12(b) Security	Common Shares ($.10 par value)
Trading Symbol	ED
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 31.2
Entity Common Stock, Shares Outstanding		345,510,031
Documents Incorporated by Reference	Documents Incorporated By Reference Portions of Con Edison’s definitive proxy statement for its Annual Meeting of Stockholders to be held on May 20, 2024, to be filed with the Commission pursuant to Regulation 14A, not later than 120 days after December 31, 2023, is incorporated in Part III of this report.
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0001047862
Current Fiscal Year End Date	--12-31
CECONY
Document Information [Line Items]
Entity File Number	1-1217
Entity Registrant Name	Consolidated Edison Company of New York, Inc.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	13-5009340
Entity Address, Address Line One	4 Irving Place,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10003
City Area Code	(212)
Local Phone Number	460-4600
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000023632
Current Fiscal Year End Date	--12-31

Regulatory Matters - Summary of Utilities Rate Plans (RECO) (Details) - RECO - USD ($) $ in Thousands		1 Months Ended	23 Months Ended
	Jan. 01, 2022	Jan. 31, 2022	Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities, amortization period	3 years
Amortization to income of net regulatory assets	$ 9,200		$ 4,800
Regulatory assets, amortization period (in years)	3 years		4 years
Weighted average cost of capital (after-tax)	$ 262,800		$ 229,900
Weighted average cost of capital (after-tax) (percent)		7.08%	7.11%
Authorized return on common equity (percent)		9.60%	9.50%
Cost of long-term debt (percent)		4.74%	4.88%
Common equity ratio (percent)		48.51%	48.32%
Tropical Storm Henri
Public Utilities, General Disclosures [Line Items]
Amortization to income of net regulatory assets	$ 2,400
Regulatory assets, amortization period (in years)	3 years
Rate Plan for Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes		$ 9,650	$ 12,000
Actual return on common equity (percent)	9.60%		5.40%
Rate Plan for Year 2
Public Utilities, General Disclosures [Line Items]
Actual return on common equity (percent)	9.70%		2.30%
Period 1
Public Utilities, General Disclosures [Line Items]
Amortizations to income of net regulatory (assets) and liabilities	$ 200
Regulatory liabilities, amortization period	3 years
Period 2
Public Utilities, General Disclosures [Line Items]
Amortizations to income of net regulatory (assets) and liabilities	$ 10,000

Leases - Other Related Information (Details)	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	11 years 4 months 24 days	12 years 3 months 18 days
Weighted Average Remaining Lease Term, Finance leases (in years)	6 years 7 months 6 days	7 years 2 months 12 days
Weighted Average Discount Rate, Operating leases (percent)	3.70%	3.70%
Weighted Average Discount Rate, Finance leases (percent)	3.00%	1.90%
Clean Energy Businesses
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	18 years 3 months 18 days
Weighted Average Discount Rate, Operating leases (percent)	4.40%
Broken Bow II
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	11 years 7 months 6 days
Weighted Average Discount Rate, Operating leases (percent)	3.80%
CECONY
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	11 years 4 months 24 days	12 years 4 months 24 days
Weighted Average Remaining Lease Term, Finance leases (in years)	2 years 8 months 12 days	2 years 3 months 18 days
Weighted Average Discount Rate, Operating leases (percent)	3.70%	3.70%
Weighted Average Discount Rate, Finance leases (percent)	3.10%	1.00%

New Financial Accounting Standards	12 Months Ended
New Financial Accounting Standards	Dec. 31, 2023
Accounting Changes and Error Corrections [Abstract]
New Financial Accounting Standards	New Financial Accounting Standards In March 2023, the FASB issued amendments to the guidance on accounting for Investments—Equity Method and Joint Ventures (Topic 323) through ASU 2023-02. The amendments would expand the use of the proportional amortization method of income recognition. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations and liquidity. In November 2023, the FASB issued amendments to the guidance on accounting for Segment Reporting (Topic 280) through ASU 2023-07. The amendments would improve the disclosures about a public entity’s reportable segments and address requests from investors for additional, more detailed information about a reportable segment’s expenses. For public entities, the amendments are effective for annual reporting periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. A public entity should apply such amendments retrospectively to all prior periods presented in the financial statements. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations and liquidity. In December 2023, the FASB issued amendments to the guidance on accounting for Income Taxes (Topic 740) through ASU 2023-09. The amendments would improve the disclosures related to income taxes. The amendments focus on three key areas: Rate Reconciliation, Income Taxes Paid, and Income (or loss)/Income tax expense (or benefit) relating to disaggregated continuing operations. For public entities, the amendments are effective for annual reporting periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations and liquidity.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147480016/944-40-65-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents, for the years ended December 31, 2023, 2022 and 2021, revenue from contracts with customers as defined in Accounting Standards Codification (ASC) Topic 606, "Revenue from Contracts with Customers," as well as additional revenue from sources other than contracts with customers, disaggregated by major source.


	2023			2022			2021
(Millions of Dollars)	Revenues from contracts with customers	Other revenues (a)	Total operating revenues	Revenues from contracts with customers	Other revenues (a)	Total operating revenues	Revenues from contracts with customers	Other revenues (a)	Total operating revenues
CECONY
Electric	$9,946	$132	$10,078	$9,917	$(166)	$9,751	$8,736	$70	$8,806
Gas	2,867	(38)	2,829	2,875	49	2,924	2,324	54	2,378
Steam	551	18	569	584	9	593	519	13	532
Total CECONY	$13,364	$112	$13,476	$13,376	$(108)	$13,268	$11,579	$137	$11,716
O&R
Electric	740	19	759	771	2	773	691	(10)	681
Gas	286	11	297	306	6	312	265	(5)	260
Total O&R	$1,026	$30	$1,056	$1,077	$8	$1,085	$956	$(15)	$941
Clean Energy Businesses (c)
Renewables	68	—	68	637	—	637	638	—	638
Energy services	7	—	7	317	—	317	234	—	234
Develop/Transfer Projects	7	—	7	44	—	44	45	—	45
Other	—	47	47	—	321	321	—	105	105
Total Clean Energy Businesses	$82	$47	$129	$998	$321	$1,319	$917	$105	$1,022
Con Edison Transmission	4	—	4	4	—	4	4	—	4
Other (b)	—	(2)	(2)	—	(6)	(6)	—	(7)	(7)
Total Con Edison	$14,476	$187	$14,663	$15,455	$215	$15,670	$13,456	$220	$13,676

(a) For the Utilities, this includes primarily revenue or negative revenue adjustments from alternative revenue programs, such as the revenue decoupling mechanisms under their NY electric and gas rate plans (see "Rate Plans" in Note B) and for 2021 recognition of late payment charges and fees that were not billed (LPCs) for the year ended December 31, 2021 and for which recovery was granted by the NYSPSC. See "COVID-19 Regulatory Matters" in Note B and "Utilities' Assessment of Late Payment Charges" below. The amount of revenue recognized under such alternative revenue programs for 2021 includes $48 million, $34 million and $74 million for CECONY's revenue decoupling mechanisms, net EAMs, and LPCs, respectively, and $(18) million, $2 million and $4 million for O&R's revenue decoupling mechanisms, net EAMs, and LPCs, respectively. For the Clean Energy Businesses, this included revenue from wholesale services. For the Clean Energy Businesses, this includes revenue from wholesale services. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

(b) Other includes the parent company, Con Edison's tax equity investments, the deferred project held for sale and consolidated adjustments. See Note X.

(c) On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

Change in Unbilled Contract and Unearned Revenues


	2023				2022			2021
(Millions of Dollars)	Unbilled contract revenue (a)		Unearned revenue (b)		Unbilled contract revenue (a)	Unearned revenue (b)		Unbilled contract revenue (a)	Unearned revenue (b)
Beginning balance as of January 1,	$80		$3		$35	$7		$11	$41
Additions (c)	2		—		324	—		242	—
Subtractions (c)	78		3	(d)	279	4	(d)	218	34	(d)
Ending balance as of December 31,	$4	(e)	$—		$80	$3		$35	$7

(a)Unbilled contract revenue represents accumulated incurred costs and earned profits on contracts (revenue arrangements), which have been recorded as revenue, but have not yet been billed to customers, and which represent contract assets as defined in Topic 606. Substantially all accrued unbilled contract revenue is expected to be collected within one year. Unbilled contract revenue arises from the cost-to-cost method of revenue recognition. Unbilled contract revenue from fixed-price type contracts is converted to billed receivables when amounts are invoiced to customers according to contractual billing terms, which generally occur when deliveries or other performance milestones are completed.

(b)Unearned revenue represents a liability for billings to customers in excess of earned revenue, which are contract liabilities as defined in Topic 606.

(c)Additions for unbilled contract revenue and subtractions for unearned revenue represent additional revenue earned. Additions for unearned revenue and subtractions for unbilled contract revenue represent billings. Activity also includes appropriate balance sheet classification for the period.

(d)Of the subtractions from unearned revenue, $3 million, $4 million and $34 million were included in the balances as of January 1, 2023, 2022, and 2021, respectively.

(e)Following the sale of the Clean Energy Businesses, Con Edison received substantially all contract revenue, net of certain costs incurred, for a battery storage project located in Imperial County, California. See Note W.

Current Expected Credit Losses - Schedule of Major Portfolio Segment Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Reserve adjustments	$ 38	$ 5	$ 169
Accounts receivable - customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance at January 1,	322	317	148
Recoveries	14	17	14
Write-offs	(138)	(103)	(91)
Reserve adjustments	162	91	246
Ending Balance December 31,	360	322	317
Other receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance at January 1,	10	22	7
Recoveries	0	0	1
Write-offs	(5)	(6)	(2)
Reserve adjustments	8	(6)	16
Ending Balance December 31,	13	10	22
CECONY
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Reserve adjustments	39	10	166
CECONY \| Accounts receivable - customers \| Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance at January 1,	314	304	138
Recoveries	12	16	12
Write-offs	(131)	(94)	(86)
Reserve adjustments	158	88	240
Ending Balance December 31,	353	314	304
CECONY \| Other receivables \| Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance at January 1,	7	19	4
Recoveries	0	0	1
Write-offs	(3)	(4)	(1)
Reserve adjustments	5	(8)	15
Ending Balance December 31,	$ 9	$ 7	$ 19

Dispositions - Pre-Tax Operating Income (Details) - Clean Energy Businesses - Disposal Group, Held-for-sale, Not Discontinued Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax operating income	$ 25	$ 466	$ 310
Pre-tax operating income, excluding non-controlling interest	$ 21	$ 406	$ 158

Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 13	$ 21
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Expense	Other Nonoperating Expense
CECONY
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 12	$ 20
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Expense	Other Nonoperating Expense

Regulatory Matters - Utility Rate Narrative and RECO Narrative (Details) $ in Thousands					1 Months Ended				23 Months Ended	36 Months Ended
	Jan. 01, 2024 USD ($)	Aug. 30, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Aug. 31, 2023 USD ($) substation	Apr. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2022	Dec. 31, 2021	Dec. 31, 2025	Dec. 31, 2022	Dec. 31, 2023 USD ($)
CECONY
Public Utilities, General Disclosures [Line Items]
Number of substations \| substation					2
Deferred costs												$ 3,000
CECONY \| Electric
Public Utilities, General Disclosures [Line Items]
Authorized return on common equity (percent)											8.80%
Common equity ratio (percent)											48.00%
CECONY \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Authorized return on common equity (percent)										925.00%
Common equity ratio (percent)										48.00%
RECO
Public Utilities, General Disclosures [Line Items]
Deferred costs												$ 4,800
Authorized return on common equity (percent)								9.60%	9.50%
Common equity ratio (percent)								48.51%	48.32%
RECO \| New Jersey Board of Public Utilities
Public Utilities, General Disclosures [Line Items]
Investment plan							$ 47,800
Investment plan, term (in years)							5 years
RECO \| Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 18,200		$ 16,900
RECO \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 20,700
RECO \| Electric \| New Jersey Board of Public Utilities
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 9,650
Eastern Queens Reliability Project
Public Utilities, General Disclosures [Line Items]
Estimated cost of substations					$ 1,200,000
Brooklyn Clean Energy Hub
Public Utilities, General Disclosures [Line Items]
Estimated cost of substations						$ 810,000

Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table represents the balance of asset retirement obligations as of December 31, 2023 and 2022, and changes to the obligation for the years then ended:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Beginning Balance as of January 1,	$500	$577	$499	$504
ARO held for sale (a)	—	(77)	—	—
Changes in estimated cash flows	76	44	75	43
Accretion expense	17	18	17	14
Liabilities settled	(71)	(62)	(71)	(62)
Ending Balance as of December 31, (b)	$522	$500	$520	$499

(a)The asset retirement obligations of the Clean Energy Businesses (inclusive of those of Broken Bow II) in 2022, and of Broken Bow II in 2023 are reflected in current liabilities held for sale on Con Edison's consolidated balance sheets as of December 31, 2022 and 2023, respectively. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. For 2023, $3 million of asset retirement obligations related to Broken Bow II are not shown in the table above, as they are already excluded from the beginning balance as of January 1, 2023 for Con Edison. See Note A and Note X.

(b)At December 31, 2023, Con Edison and CECONY recorded reductions of $77 million to the regulatory liability associated with cost of removal to reflect depreciation and interest expense. At December 31, 2022, Con Edison and CECONY recorded reductions of $78 million and $77 million, respectively, to the regulatory liability associated with cost of removal to reflect depreciation and interest expense.

Related Party Transactions

12 Months Ended

Dec. 31, 2023

Related Party Transactions

The NYSPSC generally requires that the Utilities and Con Edison’s other subsidiaries be operated as separate entities. The Utilities and the other subsidiaries are required to have separate operating employees and operating officers of the Utilities may not be operating officers of the other subsidiaries. The Utilities may provide administrative and other services to, and receive such services from, Con Edison and its other subsidiaries only pursuant to cost allocation procedures approved by the NYSPSC. Transfers of assets between the Utilities and Con Edison or its other subsidiaries may be made only as approved by the NYSPSC. The debt of the Utilities is to be raised directly by the Utilities and not derived from Con Edison. Without the prior permission of the NYSPSC, the Utilities may not make loans to, guarantee the obligations of, or pledge assets as security for the indebtedness of Con Edison or its other subsidiaries. The NYSPSC limits the dividends that the Utilities may pay Con Edison. See “Dividends” in Note C. As a result, substantially all of the net assets of CECONY and O&R ($19,146 million and $1,062 million, respectively), at December 31, 2023, are considered restricted net assets. The NYSPSC may impose additional measures to separate, or “ring fence,” the Utilities from Con Edison and its other subsidiaries. See “Rate Plans” in Note B.

The costs of administrative and other services provided by CECONY to, and received by it from, Con Edison and its other subsidiaries for the years ended December 31, 2023, 2022 and 2021 were as follows:


	CECONY (a)
(Millions of Dollars)	2023	2022	2021
Cost of services provided	$146	$135	$137
Cost of services received	82	75	68

(a) On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

In addition, CECONY and O&R have joint gas supply arrangements in connection with which CECONY sold to O&R $82 million, $144 million and $90 million of natural gas for the years ended December 31, 2023, 2022 and 2021, respectively. These amounts are net of the effect of related hedging transactions.

At December 31, 2023 and 2022, CECONY's net receivable (payable) to Con Edison for income taxes were $110 million and $(89) million, respectively.

The Utilities perform work and incur expenses on behalf of New York Transco, a company in which Con Edison Transmission has a 45.7 percent interest in New York Transco's New York Energy Solution project and a 41.7 percent interest in New York Transco's share of the Propel NY Energy project that is jointly owned with the New York Power Authority. The Utilities bill New York Transco for such work and expenses in accordance with established policies. For the years ended December 31, 2023 and 2022, the amounts billed by the Utilities to New York Transco were $7.3 million and $8.0 million, respectively.

CECONY has a 20-year transportation contract with Mountain Valley Pipeline, LLC (MVP) for 250,000 dekatherms per day of capacity. Con Edison Transmission has an interest in MVP. See "Investment in Mountain Valley Pipeline, LLC (MVP) " in Note A. In October 2017, the Environmental Defense Fund and the Natural Resource Defense Council requested the NYSPSC to prohibit CECONY from recovering costs under its contract with MVP unless CECONY can demonstrate that the contract is in the public interest. CECONY advised the NYSPSC that it would respond to the request if the NYSPSC opened a proceeding to consider this request. CECONY has not incurred costs under the contract.

FERC has authorized CECONY to lend funds to O&R for a period of not more than 12 months, in an amount not to exceed $250 million, at prevailing market rates. At December 31, 2023 and 2022 there were no outstanding loans to O&R.

The Clean Energy Businesses had financial electric capacity contracts with CECONY and O&R. For the year ended December 31, 2022, the Clean Energy Businesses realized a $5 million gain under these contracts. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. As a result of the sale, the Clean Energy Businesses are no longer recognized as a related party. See Note W and Note X.

The Consolidated Edison Foundation, Inc. (the Foundation), established in December 2023, is a non-consolidated not-for-profit corporation funded by Con Edison that plans to make contributions to selected charitable organizations. In December 2023, Con Edison made an unconditional promise to give $12 million to the Foundation. For the year ended December 31, 2023, Con Edison accrued such amount as an expense in “Other Income and Deductions” within its consolidated income statement.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147480990/946-20-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147480990/946-20-50-6

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 2
-Subparagraph (e)
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-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
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-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.6-07(2)(e))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//850/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

+ Details

Revenue Recognition - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Unbilled contract revenue
Beginning balance	$ 80	$ 35	$ 11
Additions	2	324	242
Subtractions	78	279	218
Ending balance	4	80	35
Unearned revenue
Beginning balance	3	7	41
Additions	0	0	0
Subtractions	3	4	34
Ending balance	0	3	7
Contracts with customer, revenue recognized, amount outstanding end of last period	$ 3	$ 4	$ 34

Other Postretirement Benefits - Schedule of Change of Assumed Health Care Cost Trend Rate (Details) - Other Postretirement Benefits	Dec. 31, 2023
Pre-65 Medical
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	6.80%
Ultimate Cost Trend Rate	4.50%
Post-65 Medical
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	4.50%
Ultimate Cost Trend Rate	4.50%
Prescription Medications
Defined Benefit Plan Disclosure [Line Items]
Initial Cost Trend Rate	7.25%
Ultimate Cost Trend Rate	4.50%

Derivative Instruments and Hedging Activities - Aggregate Fair Value of Companies' Derivative Instruments with Credit-Risk-Related Contingent Features (Details) $ in Millions	Dec. 31, 2023 USD ($)
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	$ 302
Collateral posted	280
Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	41
Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	147
Derivatives in net asset position additional collateral	3
Additional Collateral Required Due To Loss Of Unsecured Credit
Derivatives, Fair Value [Line Items]
Collateral posted	16
CECONY
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	280
Collateral posted	280
CECONY \| Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	24
CECONY \| Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	$ 117

Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	$ 161	$ 287	$ 343
Interest cost on projected benefit obligation	649	505	471
Expected return on plan assets	(1,114)	(1,168)	(1,096)
Recognition of net actuarial loss/(gain)	(232)	377	787
Recognition of prior service credit	(17)	(16)	(17)
TOTAL PERIODIC BENEFIT COST/(CREDIT)	(553)	(15)	488
Cost capitalized	(81)	(137)	(154)
Reconciliation to rate level	282	259	(226)
Total credit recognized	(352)	107	108
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	151	270	321
Interest cost on projected benefit obligation	611	475	443
Expected return on plan assets	(1,061)	(1,109)	(1,040)
Recognition of net actuarial loss/(gain)	(219)	358	746
Recognition of prior service credit	(19)	(21)	(19)
TOTAL PERIODIC BENEFIT COST/(CREDIT)	(537)	(27)	451
Cost capitalized	(78)	(129)	(146)
Reconciliation to rate level	261	245	(216)
Total credit recognized	$ (354)	$ 89	$ 89

Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 53	$ 64	$ 35
Income tax benefit	15	18	10
Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	41	52	23
Time-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2	2	2
Non-employee director deferred stock compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	3	3	3
Stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7	7	7
CECONY
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	48	54	31
Income tax benefit	13	15	9
CECONY \| Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	36	43	19
CECONY \| Time-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2	2	2
CECONY \| Non-employee director deferred stock compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	3	3	3
CECONY \| Stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 7	$ 6	$ 7

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Site Contingency [Line Items]
Regulatory assets	$ 4,888	$ 4,279
Regulatory liabilities	5,473	6,401
Asbestos Suits
Site Contingency [Line Items]
Accrued liability	8	8
Regulatory assets	8	8
Workers' Compensation
Site Contingency [Line Items]
Accrued liability	56	61
Regulatory liabilities	$ 17	$ 11
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities	Accrued Liabilities
CECONY \| Asbestos Suits
Site Contingency [Line Items]
Accrued liability	$ 7	$ 7
Regulatory assets	7	7
CECONY \| Workers' Compensation
Site Contingency [Line Items]
Accrued liability	54	59
Regulatory liabilities	$ 17	$ 11
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities	Accrued Liabilities

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Dispositions (Tables)

12 Months Ended

Dec. 31, 2023

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations

The following table shows the pre-tax operating income for the Clean Energy Businesses.


	For the Year Ended December 31,
(Millions of Dollars)	2023	2022	2021
Pre-tax operating income	$25	$466	$310
Pre-tax operating income, excluding non-controlling interest	21	406	158


(Millions of Dollars)	December 31, 2023	December 31, 2022
ASSETS
CURRENT ASSETS
Cash and temporary cash investments	$—	$25
Accounts receivable and other receivables - net allowance for uncollectible accounts	1	319
Accrued unbilled revenue	1	51
Fuel oil, gas in storage, materials and supplies, at average cost	—	56
Restricted cash	5	223
Fair value of derivatives assets	—	84
Prepayments	—	35
Other current assets	1	24
TOTAL CURRENT ASSETS	8	817
NON-UTILITY PLANT
Non-utility property, net accumulated depreciation	76	4,197
Construction work in progress	—	522
NET PLANT	76	4,719
OTHER NONCURRENT ASSETS
Goodwill	—	31
Intangible assets, less accumulated amortization	72	1,222
Operating lease right-of-use asset	7	266
Fair value of derivatives assets	—	93


Other deferred charges and noncurrent assets	—	14
TOTAL OTHER NONCURRENT ASSETS	79	1,626
TOTAL ASSETS	$163	$7,162


(Millions of Dollars)	December 31, 2023	December 31, 2022
LIABILITIES
CURRENT LIABILITIES
Long-term debt due within one year	$2	$353
Term loan	—	150
Accounts payable	—	326





Operating lease liabilities	2	33
Accrued Interest	—	40
Other current liabilities	4	71
TOTAL CURRENT LIABILITIES	8	973
NONCURRENT LIABILITIES
Asset retirement obligations	3	77

Operating lease liabilities	5	248
Other deferred credits and noncurrent liabilities	—	20

TOTAL NONCURRENT LIABILITIES	8	345
LONG-TERM DEBT	60	2,292
TOTAL LIABILITIES	$76	$3,610

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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+ Details

Other Postretirement Benefits - Additional Information (Details) - Other Postretirement Benefits - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in liability for other postretirement benefits	$ (164,000,000)	$ (50,000,000)
Noncurrent liabilities	224,000,000	72,000,000
Increase (decrease) in regulatory liabilities	123,000,000
Other comprehensive income (loss), unrecognized net losses	2,000,000
Other comprehensive (income) loss, prior service cost	0
Expected contributions	7,000,000
CECONY
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in liability for other postretirement benefits	(138,000,000)	(21,000,000)
Noncurrent liabilities	154,000,000	$ 27,000,000
Increase (decrease) in regulatory liabilities	119,000,000
Other comprehensive income (loss), unrecognized net losses	1,000,000
Other comprehensive (income) loss, prior service cost	$ 0

- Definition

Amount of obligation due after one year or beyond the normal operating cycle, if longer.

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+ Details

Consolidated Statement of Comprehensive Income - CECONY - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
NET INCOME	$ 2,519	$ 1,660	$ 1,346
Pension and other postretirement benefit plan liability adjustments, net of taxes	0	16	30
Other income, net of taxes	0	1	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES	0	17	30
COMPREHENSIVE INCOME	2,519	1,677	1,376
CECONY
NET INCOME	1,606	1,390	1,344
Pension and other postretirement benefit plan liability adjustments, net of taxes	(2)	3	7
Other income, net of taxes	0	1	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES	(2)	4	7
COMPREHENSIVE INCOME	$ 1,604	$ 1,394	$ 1,351

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Summary of Significant Accounting Policies and Other Matters - Other Deferred Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Prepayments	$ 50	$ 24
Other deferred charges and noncurrent assets	179	105
Depreciation expense, other deferred charges and noncurrent assets and prepayments	21	15	$ 12
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments	58	37
CECONY
Public Utility, Property, Plant and Equipment [Line Items]
Prepayments	49	23
Other deferred charges and noncurrent assets	178	103
Depreciation expense, other deferred charges and noncurrent assets and prepayments	20	14	$ 11
Accumulated depreciation, other deferred charges and noncurrent assets and prepayments	$ 53	$ 33

Consolidated Balance Sheet - CECONY (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts receivable - customers, allowance for uncollectible accounts	$ 360	$ 322
Other receivables, allowance for uncollectible accounts	13	10
Non-utility property, accumulated depreciation	24	23
CECONY
Accounts receivable - customers, allowance for uncollectible accounts	353	314
Other receivables, allowance for uncollectible accounts	9	7
Non-utility property, accumulated depreciation	$ 25	$ 25

Consolidated Statement of Capitalization - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Regulated Operations [Abstract]
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	345	355
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE INCOME	$ 21,136	$ 20,665
Pension plan liability adjustments, net of taxes	23	23
Unrealized losses on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment for unrealized losses included in regulatory assets, net of taxes	(1)	(1)
TOTAL ACCUMULATED OTHER COMPREHENSIVE INCOME, NET OF TAXES	22	22
Equity	21,158	20,687
Noncontrolling interest	0	202
TOTAL EQUITY (See Statement of Equity)	$ 21,158	$ 20,889	$ 20,336	$ 19,065

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+ Details

Capitalization

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Capitalization

Common Stock

Con Edison is authorized to issue 500,000,000 shares of its common stock and CECONY is authorized to issue 340,000,000 of its common stock. At December 31, 2023 and 2022, 345,415,772 and 354,962,058 shares, respectively, of Con Edison common stock were outstanding. At December 31, 2023 and 2022, 235,488,094 million shares of CECONY common stock were outstanding, all of which were owned by Con Edison. At December 31, 2023 and 2022, Con Edison had 33,753,963 and 23,210,700 treasury shares, respectively, including 21,976,200 shares of Con Edison stock that CECONY purchased prior to 2001 in connection with Con Edison’s stock repurchase plan. CECONY presents in the financial statements the cost of the Con Edison stock it owns as a reduction of common shareholder’s equity.

In 2023, Con Edison entered into accelerated share repurchase agreements with two dealers to repurchase $1,000 million in aggregate of Con Edison’s Common Shares ($.10 par value) (Common Shares). Con Edison made payments of $1,000 million in aggregate to the dealers and received deliveries of 10,543,263 Common Shares in aggregate.

Capitalization of Con Edison

At December 31, 2023 and 2022, Con Edison's capitalization shown on its Consolidated Statement of Capitalization includes its outstanding common stock and long-term debt and the outstanding long-term debt of the Utilities and for the 2022 period includes the long-term debt of the Clean Energy Businesses.

Dividends

In accordance with NYSPSC requirements, the dividends that the Utilities generally pay are limited to not more than 100 percent of their respective income available for dividends calculated on a two–year rolling average basis. See Note U. Excluded from the calculation of “income available for dividends” are non-cash charges to income resulting from accounting changes or charges to income resulting from significant unanticipated events. The restriction also does not apply to dividends paid in order to transfer to Con Edison proceeds from major transactions, such as asset sales, or to dividends reducing each utility subsidiary’s equity ratio to a level appropriate to its business risk.

Long-term Debt

Long-term debt maturing in the period 2024-2028 is as follows:


(Millions of Dollars)	Con Edison	(a)	CECONY
2024	$250		$250
2025	—		—
2026	250		250
2027	430		350
2028	800		800

(a)Amounts shown exclude $62 million of debt for Broken Bow II, a deferred project, which was classified as held for sale as of December 31,

2023 and is shown under “Project Debt Held for Sale" on Con Edison's Consolidated Statement of Capitalization. See "Assets Held for Sale" in Note A and Note X for additional information.

CECONY has issued $450 million of tax–exempt debt through the New York State Energy Research and Development Authority (NYSERDA) that currently bears interest at a rate determined weekly and is subject to tender by bondholders for purchase by the company.

The carrying amounts and fair values of long-term debt at December 31, 2023 and 2022 are:


(Millions of Dollars)	2023				2022
Long-Term Debt (including current portion) (a)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison	$22,177	(b)	$20,525	(b)	$20,796	(c)	$18,234	(c)
CECONY	21,060		19,517		19,080		16,699

(a)Amounts shown are net of unamortized debt expense and unamortized debt discount of $222 million and $215 million for Con Edison and CECONY, respectively, as of December 31, 2023 and $202 million and $195 million for Con Edison and CECONY, respectively, as of December 31, 2022.

(b)Amounts shown exclude the debt of Broken Bow II, a deferred project that was classified as held for sale as of December 31, 2023 and is shown under “Project Debt Held for Sale" on Con Edison's Consolidated Statement of Capitalization. The carrying value and fair value of Broken Bow II's long-term debt, including the current portion, as of December 31, 2023 was $62 million and $58 million, respectively. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

(c)Amounts shown exclude the debt of the Clean Energy Businesses, that were classified as held for sale as of December 31, 2022. See "Assets Held for Sale" in Note A, and Note X for additional information. The carrying value and fair value of the Clean Energy Businesses’ long-term debt, including the current portion, as of December 31, 2022 was $2,645 million and $2,489 million, respectively. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

The fair values of the Companies' long-term debt have been estimated primarily using available market information and at December 31, 2023 are classified as Level 2 liabilities (see Note R).

Significant Debt Covenants

The significant debt covenants under the financing arrangements for the Companies' debentures include obligations to pay principal and interest when due and covenants not to consolidate with or merge into any other entity unless certain conditions are met. The Companies' debentures have no cross default provisions. The tax–exempt financing arrangements of CECONY are subject to covenants for the debentures discussed above and the covenants discussed below. The Companies were in compliance with their significant debt covenants at December 31, 2023.

The tax-exempt financing arrangements involved the issuance of uncollateralized promissory notes of CECONY to NYSERDA in exchange for the net proceeds of a like amount of tax–exempt bonds with substantially the same terms sold to the public by NYSERDA. The tax-exempt financing arrangements include covenants with respect to the tax–exempt status of the financing, including covenants with respect to the use of the facilities financed. The arrangements include provisions for the maintenance of liquidity and credit facilities, the failure to comply with which would, except as otherwise provided, constitute an event of default for the debt to which such provisions applied.

The failure to comply with debt covenants would, except as otherwise provided, constitute an event of default for the debt to which such provisions applied. If an event of default were to occur, the principal and accrued interest on the debt to which such event of default applied and, in the case of the Con Edison notes, a make-whole premium might and, in the case of certain events of default would, become due and payable immediately.

The liquidity and credit facilities currently in effect for the tax–exempt financing include covenants that the ratio of debt to total capital of CECONY will not at any time exceed 0.65 to 1 and that, subject to certain exceptions, CECONY will not mortgage, lien, pledge or otherwise encumber its assets. Certain of the facilities also include as events of default, defaults in payments of other debt obligations in excess of specified levels ($150 million or $100 million, depending on the facility).

Stock-Based Compensation - Summary of Changes in Status of Time-Based Awards (Details) - Time-based Awards	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Units
Non-vested at beginning of period (in shares) \| shares	180,588
Granted (in shares) \| shares	198,600
Vested (in shares) \| shares	(19,950)
Forfeited (in shares) \| shares	(14,037)
Non-vested at end of period (in shares) \| shares	345,201
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 84.69
Granted (in dollars per share) \| $ / shares	92.93
Vested (in dollars per share) \| $ / shares	78.00
Forfeited (in dollars per share) \| $ / shares	87.26
Non-vested at end of period (in dollars per share) \| $ / shares	$ 89.71
CECONY
Units
Non-vested at beginning of period (in shares) \| shares	147,415
Granted (in shares) \| shares	166,539
Vested (in shares) \| shares	(18,550)
Forfeited (in shares) \| shares	(6,341)
Non-vested at end of period (in shares) \| shares	289,063
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 85.10
Granted (in dollars per share) \| $ / shares	93.38
Vested (in dollars per share) \| $ / shares	78.00
Forfeited (in dollars per share) \| $ / shares	88.47
Non-vested at end of period (in dollars per share) \| $ / shares	$ 90.25

Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Steam) (Details) - CECONY - Steam	12 Months Ended										36 Months Ended		108 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 31, 2026 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities, amortization period								3 years				3 years
Amortizations to income of net regulatory (assets) and liabilities												$ 37,000,000
Negative revenue adjustments													$ 0
Cost reconciliation, deferred net regulatory liabilities	$ 18,000,000			$ 8,000,000		$ 14,000,000	$ 8,000,000		$ 42,000,000
Cost reconciliation, deferred net regulatory assets	11,000,000	$ 32,000,000	$ 35,000,000		$ 1,000,000			$ 17,000,000				$ 17,000,000	$ 32,000,000
Deferred regulatory asset (liability)	0		(1,000,000)	(2,000,000)
Increase (decrease) in regulatory liabilities	100,000		0	$ 0	0	0	0	0	0	$ 100,000
Authorized return on common equity (percent)												9.30%
Earnings sharing, positive adjustment						2,300,000	1,100,000	4,000,000
Earnings sharing, threshold limit	$ 0	0	$ 0		$ 5,000,000	$ 16,500,000	$ 8,500,000	7,800,000	$ 11,500,000	$ 0
Earnings sharing (percent)					9.90%
Earnings sharing, additional adjustment		$ 200,000						400,000
Common equity ratio (percent)												48.00%
Revenue from contracts with customer, late payment charges, annual cap, percent (in percent)	0.005
Difference in property taxes (percent)	90.00%											90.00%
Deferral, annual maximum (not more than) (percent)												0.10%
Recovery deferral (percent)	80.00%
Maximum deferral (percent)	30.00%
Other regulatory liabilities								$ 8,000,000				$ 8,000,000
Unprotected Portion
Public Utilities, General Disclosures [Line Items]
Increase in regulatory liability resulting from TCJA	$ 24,000,000
Scenario, Forecast \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Authorized return on common equity (percent)											9.25%
Earnings sharing (percent)											9.75%
Common equity ratio (percent)											48.00%
Rate Plan for Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes												(22,400,000)
Weighted average cost of capital (after-tax)												$ 1,511,000,000
Weighted average cost of capital (after-tax) (percent)												7.10%
Actual return on common equity (percent)												9.82%
Cost of long-term debt rate							5.17%
Requested rate increase (decrease), amount	77,800,000
Late payment charges and fees	$ 2,500,000
Deferral, annual maximum (not more than) (percent)	0.10%
Rate Plan for Year 1 \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Increase in regulatory liability resulting from TCJA	$ 3,000,000
Tax cuts and jobs act of 2017, change in tax rate, regulatory asset, income tax benefit	11,000,000
Rate Plan for Year 1 \| Scenario, Forecast \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Base rate changes											$ 110,000,000
Amortizations to income of net regulatory (assets) and liabilities											15,000,000
Potential Penalty Expense											3,700,000
Net utility plant reconciliations											2,025,000,000
Weighted average cost of capital (after-tax)											$ 1,799,000,000
Weighted average cost of capital (after-tax) (percent)											6.78%
Cost of long-term debt rate											4.51%
Rate Plan for Year 1 \| Production
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations												$ 1,752,000,000
Rate Plan for Year 1 \| Distribution
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations												6,000,000
Rate Plan for Year 2
Public Utilities, General Disclosures [Line Items]
Base rate changes												19,800,000
Weighted average cost of capital (after-tax)												$ 1,547,000,000
Weighted average cost of capital (after-tax) (percent)												7.13%
Actual return on common equity (percent)												10.88%
Cost of long-term debt rate							5.23%
Requested rate increase (decrease), amount	77,800,000
Late payment charges and fees	$ 3,000,000
Deferral, annual maximum (not more than) (percent)	0.075%
Rate Plan for Year 2 \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Increase in regulatory liability resulting from TCJA	$ 5,000,000
Rate Plan for Year 2 \| Scenario, Forecast \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Base rate changes											$ 44,000,000
Amortizations to income of net regulatory (assets) and liabilities											3,000,000
Potential Penalty Expense											3,800,000
Net utility plant reconciliations											2,029,000,000
Weighted average cost of capital (after-tax)											$ 1,848,000,000
Weighted average cost of capital (after-tax) (percent)											6.81%
Cost of long-term debt rate											4.58%
Rate Plan for Year 2 \| Production
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations												$ 1,732,000,000
Rate Plan for Year 2 \| Distribution
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations												11,000,000
Rate Plan for Year 3
Public Utilities, General Disclosures [Line Items]
Base rate changes												20,300,000
Weighted average cost of capital (after-tax)												$ 1,604,000,000
Weighted average cost of capital (after-tax) (percent)												7.21%
Actual return on common equity (percent)												10.54%
Cost of long-term debt rate							5.39%
Requested rate increase (decrease), amount	77,800,000
Late payment charges and fees	$ 3,500,000
Deferral, annual maximum (not more than) (percent)	0.05%
Rate Plan for Year 3 \| Protected Portion
Public Utilities, General Disclosures [Line Items]
Increase in regulatory liability resulting from TCJA	$ 6,000,000
Rate Plan for Year 3 \| Scenario, Forecast \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Base rate changes											$ 45,000,000
Amortizations to income of net regulatory (assets) and liabilities											3,000,000
Potential Penalty Expense											3,800,000
Net utility plant reconciliations											2,015,000,000
Weighted average cost of capital (after-tax)											$ 1,882,000,000
Weighted average cost of capital (after-tax) (percent)											6.83%
Cost of long-term debt rate											4.62%
Rate Plan for Year 3 \| Production
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations												$ 1,720,000,000
Rate Plan for Year 3 \| Distribution
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations												25,000,000
Rate Plan for Year 3 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential Penalty Expense												1,000,000
Rate Plan for Year 4
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												9.51%
Rate Plan for Year 5
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												11.73%
Rate Plan For Year 6
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												10.45%
Rate Plan For Year 7
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												7.91%
Rate Plan For Year 8
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												5.99%
Rate Plan For Year 9
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												5.72%
Rate Plan For Year 10
Public Utilities, General Disclosures [Line Items]
Base rate changes												$ 0
Actual return on common equity (percent)												(0.10%)

Income Tax - Summary of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 23	$ 17	$ 14
Additions based on tax positions related to the current year	8	3	3
Additions based on tax positions of prior years	3	6	2
Reductions for tax positions of prior years	(11)	(1)	(2)
Settlements	(12)	(2)	0
Balance at end of period	11	23	17
CECONY
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	8	5	3
Additions based on tax positions related to the current year	4	2	2
Additions based on tax positions of prior years	1	1	1
Reductions for tax positions of prior years	(6)	0	(1)
Settlements	0	0	0
Balance at end of period	$ 7	$ 8	$ 5

Other Postretirement Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	$ 459
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	524	$ 459
CECONY
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	439
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	502	439
Other Postretirement Benefits
CHANGE IN BENEFIT OBLIGATION
Projected benefit obligation at beginning of year	1,058	1,398	$ 1,425
Service cost	14	18	22
Interest cost on accumulated other postretirement benefit obligation	57	35	33
Net actuarial gain	(93)	(311)	(13)
Benefits paid and administrative expenses, net of subsidies	(128)	(130)	(117)
Participant contributions	55	48	48
PROJECTED BENEFIT OBLIGATION AT END OF YEAR	963	1,058	1,398
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	860	1,150	1,115
Actual return on plan assets	116	(225)	92
Employer contributions	22	13	6
Employer group waiver plan subsidies	56	55	21
Participant contributions	55	48	48
Benefits paid	(180)	(181)	(132)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	929	860	1,150
FUNDED STATUS	(34)	(198)	(248)
Unrecognized net loss/(gain)	(90)	37	41
Unrecognized prior service costs	(10)	(12)	(13)
Other Postretirement Benefits \| CECONY
CHANGE IN BENEFIT OBLIGATION
Projected benefit obligation at beginning of year	921	1,189	1,209
Service cost	12	15	16
Interest cost on accumulated other postretirement benefit obligation	49	30	28
Net actuarial gain	(94)	(239)	(3)
Benefits paid and administrative expenses, net of subsidies	(118)	(121)	(107)
Participant contributions	55	47	46
PROJECTED BENEFIT OBLIGATION AT END OF YEAR	825	921	1,189
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	708	955	940
Actual return on plan assets	84	(187)	67
Employer contributions	17	10	3
Employer group waiver plan subsidies	52	50	19
Participant contributions	55	47	46
Benefits paid	(166)	(167)	(120)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	750	708	955
FUNDED STATUS	(75)	(213)	(234)
Unrecognized net loss/(gain)	(41)	78	67
Unrecognized prior service costs	$ 0	$ 0	$ 0

Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details) - Other Postretirement Benefits $ in Millions	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2024	$ 68
2024	72
2026	73
2027	73
2028	73
2029-2033	353
CECONY
Defined Benefit Plan Disclosure [Line Items]
2024	60
2024	63
2026	64
2027	64
2028	64
2029-2033	$ 308

Related Party Transactions - Additional Information (Details) MMBTU in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) MMBTU	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Net assets	$ 21,158,000,000	$ 20,687,000,000
Other income	834,000,000	402,000,000	$ 22,000,000
Unconditional charitable contribution, accrued amount	12,000,000
CECONY
Related Party Transaction [Line Items]
Net assets	19,146,000,000	16,878,000,000	16,312,000,000	$ 14,849,000,000
Sale of natural gas	82,000,000	144,000,000	$ 90,000,000
Tax expense due to affiliates	110,000,000	(89,000,000)
Funding limit of CECONY to O&R (not to exceed)	$ 250,000,000
CECONY \| Related Party, Lending of Funds
Related Party Transaction [Line Items]
Lending period (not more than) (months)	12 months
CECONY \| Equity Method Investee \| Mountain Valley Pipeline
Related Party Transaction [Line Items]
Contract term (years)	20 years
Generating capacity per day (in dekatherms) \| MMBTU	250
CECONY \| Affiliated Entity \| Financial Electric Capacity Contract \| Con Edison Energy
Related Party Transaction [Line Items]
Gain (loss) on financial electric capacity contracts	$ 5,000,000
O&R
Related Party Transaction [Line Items]
Net assets	1,062,000,000
Outstanding loans	$ 0	0
CET Electric \| NY Transco
Related Party Transaction [Line Items]
Ownership interest, percentage	45.70%
CET Electric \| NY Transco \| Related Party
Related Party Transaction [Line Items]
Other income	$ 7,300,000	$ 8,000,000
CET Electric \| New York Transco's Propel NY Energy Project
Related Party Transaction [Line Items]
Ownership interest, percentage	41.70%

Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance as of January 1,	$ 500	$ 577
ARO held for sale	0	(77)
Changes in estimated cash flows	76	44
Accretion expense	17	18
Liabilities settled	(71)	(62)
Ending Balance as of December 31,	522	500
Asset retirement obligation, period increase (decrease)	(77)	(78)
Disposal Group, Held-for-sale, Not Discontinued Operations \| Clean Energy Businesses
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Disposal group, including discontinued operation, asset retirement obligations	3	77
CECONY
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance as of January 1,	499	504
ARO held for sale	0	0
Changes in estimated cash flows	75	43
Accretion expense	17	14
Liabilities settled	(71)	(62)
Ending Balance as of December 31,	520	499
Asset retirement obligation, period increase (decrease)	$ (77)	$ (77)

Pension Benefits - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	$ 524	$ 459
Defined benefit plan, funded (unfunded) status of plan related to private equity	$ 193
Private Equity
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
Private Equity \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Period of sale of limited partnership interests in secondary market (in years)	3 months
Private Equity \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Period of sale of limited partnership interests in secondary market (in years)	6 months
Real Estate and Other Alternatives
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
Period of liquidation (in years)	18 months
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	$ 15,404	$ 14,979	$ 18,504	$ 17,022
Pension Benefits \| U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	2,475	2,153
Pension Benefits \| International Equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1,584	1,534
Pension Benefits \| U.S. Government Issued Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	615	823
Pension Benefits \| Corporate Bonds Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	5,526	4,961
Pension Benefits \| Structured Assets Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	132	183
Pension Benefits \| Other Fixed Income Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1,210	1,088
Pension Benefits \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	338	345
Pension Benefits \| Futures
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	19	(1)
Pension Benefits \| Private Equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1,031	1,018
Pension Benefits \| Real Estate and Other Alternatives
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1,876	2,366
Pension Benefits \| Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	723	657
Pension Benefits \| Total Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	(193)	(190)
Pension Benefits \| Pending Activities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	68	42
Pension Benefits \| Fair Value, Inputs, Level 1 and 2 \| Total investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	11,899	11,086
Pension Benefits \| Fair Value, Inputs, Level 1 and 2 \| Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	(148)	(139)
Pension Benefits \| Fair Value, Inputs, Level 1 and 2 \| Investments Excluding Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	15,336	14,937
Pension Benefits \| Level 1 \| Total investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	4,113	3,754
Pension Benefits \| Level 1 \| U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	2,474	2,150
Pension Benefits \| Level 1 \| International Equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1,584	1,534
Pension Benefits \| Level 1 \| U.S. Government Issued Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	0	0
Pension Benefits \| Level 1 \| Corporate Bonds Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	0	0
Pension Benefits \| Level 1 \| Structured Assets Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	0	0
Pension Benefits \| Level 1 \| Other Fixed Income Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	0	0
Pension Benefits \| Level 1 \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	36	71
Pension Benefits \| Level 1 \| Futures
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	19	(1)
Pension Benefits \| Level 1 \| Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	(52)	(48)
Pension Benefits \| Level 1 \| Investments Excluding Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	4,061	3,706
Pension Benefits \| Level 2 \| Total investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	7,786	7,332
Pension Benefits \| Level 2 \| U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1	3
Pension Benefits \| Level 2 \| U.S. Government Issued Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	615	823
Pension Benefits \| Level 2 \| Corporate Bonds Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	5,526	4,961
Pension Benefits \| Level 2 \| Structured Assets Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	132	183
Pension Benefits \| Level 2 \| Other Fixed Income Debt
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	1,210	1,088
Pension Benefits \| Level 2 \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	302	274
Pension Benefits \| Level 2 \| Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	(96)	(91)
Pension Benefits \| Level 2 \| Investments Excluding Funds For Retiree Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	7,690	7,241
Pension Benefits \| Fair Value Measured at Net Asset Value Per Share \| Investments Valued Using NAV Per Share
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	3,630	4,041
Pension Benefits \| Fair Value Measured at Net Asset Value Per Share \| Funds For Retiree Health Benefits Measured At Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan net assets	$ (45)	$ (51)

Material Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Summary of Total Guarantees

A summary, by type and term, of Con Edison’s total guarantees under these other agreements at December 31, 2023 is as follows:


Guarantee Type	0 – 3 years	4 – 10 years	> 10 years	Total
	(Millions of Dollars)
Con Edison Transmission	$76	$—	$—	$76
Guarantees on behalf of the Clean Energy Businesses(a)	58	—	32	90
Broken Bow II	—	—	9	9
Total	$134	$—	$41	$175

Variable Interest Entities

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Variable Interest Entities

The accounting rules for consolidation address the consolidation of a variable interest entity (VIE) by a business enterprise that is the primary beneficiary. A VIE is an entity that does not have a sufficient equity investment at risk to permit it to finance its activities without additional subordinated financial support, or whose equity investors lack the characteristics of a controlling financial interest. The primary beneficiary is the business enterprise that has the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and either absorbs a significant amount of the VIE’s losses or has the right to receive benefits that could be significant to the VIE.

The Companies enter into arrangements including leases, partnerships and electricity purchase agreements, with various entities. As a result of these arrangements, the Companies retain or may retain a variable interest in these entities.

CECONY

CECONY has an ongoing long-term electricity purchase agreement with Brooklyn Navy Yard Cogeneration Partners, LP, a potential VIE. In 2023, a request was made of this counterparty for information necessary to determine whether the entity was a VIE and whether CECONY is the primary beneficiary; however, the information was not made available. See Note I for information on these electricity purchase agreements; the payments for this contract constitute CECONY's maximum exposure to loss with respect to the potential VIE.

Clean Energy Businesses

Con Edison has determined that the use of Hypothetical Liquidation at Book Value (HLBV) accounting is reasonable and appropriate to attribute income and loss to the tax equity investors for various projects owned by the Clean Energy Businesses. See "Use of Hypothetical Liquidation at Book Value" in Note A. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. In connection with the sale, Con Edison retained a tax equity interest in two renewable electric projects located in Virginia, and in the Crane Solar Project (collectively, the "Retained Projects"). Included in the sale were Con Edison's interests in CED Nevada Virginia and the Tax Equity Projects, defined below (collectively, the "Sold Projects"). The HLBV method of accounting resulted in an immaterial amount of income/(loss) for Con Edison and the tax equity investor for the Sold Projects for the year ended December 31, 2023; information for the year ended December 31, 2022 is presented below. See Note W and X.

Retained Projects

Con Edison retained a tax equity interest valued at $20 million in two renewable electric projects located in Virginia that is accounted for as an equity method investment and represents the maximum exposure to loss for this investment. See Note W. The earnings of the projects, once in service, are determined using the HLBV method of accounting and resulted in losses of $14 million ($10 million, after tax) for the year ended December 31, 2023.

Con Edison also retained its $11 million equity interest in the Crane solar project that was valued at $0 as of December 31, 2023 and is accounted for as an equity method investment. See Note W. The earnings of the project are determined using the HLBV method of accounting and were not material for the years ended December 31, 2023 and 2022.

Con Edison is not the primary beneficiary of any Retained Projects since the power to direct the activities that most significantly impact the economics of the renewable electric projects is not held by Con Edison.

Sold Projects

In 2018, the Clean Energy Businesses completed its acquisition of Sempra Solar Holdings, LLC. Included in the acquisition were certain operating projects (Tax Equity Projects) with a noncontrolling tax equity investor to which a percentage of earnings, tax attributes and cash flows are allocated. Electricity generated by the Tax Equity Projects is sold to utilities and municipalities pursuant to long-term power purchase agreements.

In 2021, a subsidiary of the Clean Energy Businesses entered into an agreement relating to certain projects (CED Nevada Virginia) with a noncontrolling tax equity investor to which a percentage of earnings, tax attributes and cash flows are allocated.

The Tax Equity Projects and CED Nevada Virginia were consolidated entities in which Con Edison had less than a 100 percent membership interest at December 31, 2022 and in which Con Edison has no interest in subsequent to the sale of the Clean Energy Businesses on March 1, 2023. Con Edison was the primary beneficiary since the power to direct the activities that most significantly impact the economics of the Tax Equity Projects and CED Nevada Virginia was held by Con Edison.


	2022		2021
(Millions of Dollars)	CED Nevada Virginia	Tax Equity Projects	CED Nevada Virginia	Tax Equity Projects
Tax equity investor	$(49)	$(11)	$(158)	$6
After tax	(37)	(8)	(119)	4
Con Edison	41	51	155	30
After tax	31	38	117	24

At December 31, 2022, Con Edison’s consolidated balance sheet included the following amounts associated with its consolidated VIEs:


	Tax Equity Projects
	Great Valley Solar (c)(d)	Copper Mountain - Mesquite Solar (c)(e)	CED Nevada Virginia (c)(f)
(Millions of Dollars)	2022	2022	2022
Assets held for sale (a)	$305	$580	$686


Total assets (a)	$305	$580	$686
Liabilities held for sale (b)	$20	$81	$331

Total liabilities (b)	$20	$81	$331

(c)Con Edison did not provide any financial or other support during the year that was not previously contractually required.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

For information on the measurement of Con Edison's investment in MVP, which was measured at fair value on a non-recurring basis, see Note A. Assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2023 and 2022 are summarized below.


	2023					2022
(Millions of Dollars)	Level 1	Level 2	Level 3	Netting Adjustment (e)	Total	Level 1	Level 2	Level 3	Netting Adjustment (e)	Total
Con Edison
Derivative assets:
Commodity (a)(b)(c)	$6	$146	$2	$(54)	$100	$84	$476	$2	$(420)	$142
Commodity held for sale (g)	—	—	—	—	—	6	34	31	2	73
Interest rate swaps (a)(b)(c)(f) (g)	—	—	—	—	—	—	106	—	—	106
Other (a)(b)(d)	505	118	—	—	623	437	116	—	—	553
Total assets	$511	$264	$2	$(54)	$723	$527	$732	$33	$(418)	$874
Derivative liabilities:
Commodity (a)(b)(c)	$22	$347	$10	$(65)	$314	$18	$204	$16	$(184)	$54
Commodity held for sale (g)	—	—	—	—	—	8	24	2	2	36

Total liabilities	$22	$347	$10	$(65)	$314	$26	$228	$18	$(182)	$90
CECONY
Derivative assets:
Commodity (a)(b)(c)	$6	$143	$1	$(52)	$98	$83	$434	$2	$(388)	$131
Other (a)(b)(d)	488	113	—	—	601	422	110	—	—	532
Total assets	$494	$256	$1	$(52)	$699	$505	$544	$2	$(388)	$663
Derivative liabilities:
Commodity (a)(b)(c)	$20	$326	$6	$(65)	$287	$18	$198	$8	$(180)	$44

(a)The Companies’ policy is to review the fair value hierarchy and recognize transfers into and transfers out of the levels at the end of each reporting period. Con Edison and CECONY had $9 million and $6 million of derivative liabilities, respectively, transferred from level 3 to level 2 during the year ended December 31, 2023 because of availability of observable market data due to the decrease in the terms of certain contracts from beyond three years as of September 30, 2023 to less than three years as of December 31, 2023. Con Edison and CECONY had an immaterial amount of commodity derivative liabilities and $10 million and $9 million of commodity derivative assets, respectively, transferred from level 3 to level 2 during the year ended December 31, 2022 because of availability of observable market data due to the decrease in the terms of certain contracts from beyond three years as of September 30, 2022 to less than three years as of December 31, 2022.

(b)Level 2 assets and liabilities include investments held in the deferred compensation plan and/or non-qualified retirement plans, exchange-traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1, and certain over-the-counter derivative instruments for electricity, refined products and natural gas. Derivative instruments classified as Level 2 are valued using industry standard models that incorporate corroborated observable inputs, such as pricing services or prices from similar instruments that trade in liquid markets, time value and volatility factors.

(c)The accounting rules for fair value measurements and disclosures require consideration of the impact of nonperformance risk (including credit risk) from a market participant perspective in the measurement of the fair value of assets and liabilities. At December 31, 2023 and 2022, the Companies determined that nonperformance risk would have no material impact on their financial position or results of operations.

(d)Other assets: Level 1 assets are comprised primarily of mutual/commingled funds, and Level 2 assets are comprised primarily of the cash value of life insurance contracts.

(e)Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(f)See Note Q.

(g)On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

Schedule of Commodity Derivatives

Fair Value of Level 3 at December 31, 2023

(Millions of Dollars)

Valuation Techniques

Unobservable Inputs

Range

Con Edison — Commodity

Electricity

$(8)

Discounted Cash Flow

Forward capacity prices (a)

$1.90 - $11.75 per kW-month

Transmission Congestion Contracts

immaterial

Discounted Cash Flow

Inter-zonal forward price curves adjusted for historical zonal losses (b)

$(0.33) - $2.20 per MWh

Total Con Edison - Commodity

$(8)

CECONY — Commodity

Electricity

$(5)

Discounted Cash Flow

Forward capacity prices (a)

$1.90 - $11.75 per kW-month

Transmission Congestion Contracts

immaterial

Discounted Cash Flow

Inter-zonal forward price curves adjusted for historical zonal losses (b)

$(0.33) - $2.20 per MWh

Total CECONY — Commodity

$(5)

(a)Generally, increases/(decreases) in this input in isolation would result in a higher/(lower) fair value measurement.

(b)Generally, increases/(decreases) in this input in isolation would result in a lower/(higher) fair value measurement.

Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value

The table listed below provides a reconciliation of the beginning and ending net balances for assets and liabilities measured at fair value for the years ended December 31, 2023 and 2022 and classified as Level 3 in the fair value hierarchy:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Beginning balance as of January 1,	$15	$(11)	$(6)	$(7)
Included in earnings	(4)	(11)	(2)	(5)
Included in regulatory assets and liabilities	33	11	31	10

Settlements	4	11	2	5
Changes in level 3 assets and liabilities held for sale (a)	—	25	—	—
Decrease due to the sale of the Clean Energy Businesses (a)	(29)	—	—	—
Transfer out of level 3	(27)	(10)	(30)	(9)
Ending balance as of December 31,	$(8)	$15	$(5)	$(6)

(a)On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

Material Contingencies - Con Edison Transmission (Details) - Payment Guarantee by CET Electric of Contributions to New York Transco LLC	12 Months Ended
	Dec. 31, 2023
Guarantor Obligations [Line Items]
Estimated project cost percentage	175.00%
NY Transco
Guarantor Obligations [Line Items]
Ownership interest, percentage	45.70%

Held-for-Sale Treatment of the Clean Energy Businesses - Additional Information (Details)	Dec. 31, 2023 MWh project	Mar. 01, 2023 project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period to obtain counter party consent (in years)	2 years
Disposal Group, Held-for-sale, Not Discontinued Operations \| Clean Energy Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of tax equity projects \| project	3	2
Electric Energy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional amount \| MWh	34,892,535
Broken Bow II \| Electric Energy \| Clean Energy Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of deferred projects \| project	1	1
Notional amount \| MWh	75

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 14,476	$ 15,455	$ 13,456
Cost of services provided	14,663	15,670	13,676
Other
Disaggregation of Revenue [Line Items]
Cost of services provided	187	215	220
CECONY
Disaggregation of Revenue [Line Items]
Cost of services provided	13,476	13,268	11,716
Operating Segments \| Clean Energy Businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	82	998	917
Cost of services provided	129	1,319	1,022
Operating Segments \| Clean Energy Businesses \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	47	321	105
Operating Segments \| Clean Energy Businesses \| Renewables
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	68	637	638
Cost of services provided	68	637	638
Operating Segments \| Clean Energy Businesses \| Renewables \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	0	0	0
Operating Segments \| Clean Energy Businesses \| Energy services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7	317	234
Cost of services provided	7	317	234
Operating Segments \| Clean Energy Businesses \| Energy services \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	0	0	0
Operating Segments \| Clean Energy Businesses \| Develop/Transfer Projects
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7	44	45
Cost of services provided	7	44	45
Operating Segments \| Clean Energy Businesses \| Develop/Transfer Projects \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	0	0	0
Operating Segments \| Clean Energy Businesses \| Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Cost of services provided	47	321	105
Operating Segments \| Clean Energy Businesses \| Other \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	47	321	105
Operating Segments \| Con Edison Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4	4	4
Cost of services provided	4	4	4
Operating Segments \| Con Edison Transmission \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	0	0	0
Operating Segments \| CECONY
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	13,364	13,376	11,579
Cost of services provided	13,476	13,268	11,716
Operating Segments \| CECONY \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	112	(108)	137
Operating Segments \| CECONY \| Decoupling Mechanism
Disaggregation of Revenue [Line Items]
Cost of services provided			48
Operating Segments \| CECONY \| Net EAMs
Disaggregation of Revenue [Line Items]
Cost of services provided			34
Operating Segments \| CECONY \| LPCs
Disaggregation of Revenue [Line Items]
Cost of services provided			74
Operating Segments \| CECONY \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9,946	9,917	8,736
Cost of services provided	10,078	9,751	8,806
Operating Segments \| CECONY \| Electric \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	132	(166)	70
Operating Segments \| CECONY \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,867	2,875	2,324
Cost of services provided	2,829	2,924	2,378
Operating Segments \| CECONY \| Gas \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	(38)	49	54
Operating Segments \| CECONY \| Steam
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	551	584	519
Cost of services provided	569	593	532
Operating Segments \| CECONY \| Steam \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	18	9	13
Operating Segments \| O&R
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,026	1,077	956
Cost of services provided	1,056	1,085	941
Operating Segments \| O&R \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	30	8	(15)
Operating Segments \| O&R \| Decoupling Mechanism
Disaggregation of Revenue [Line Items]
Cost of services provided			(18)
Operating Segments \| O&R \| Net EAMs
Disaggregation of Revenue [Line Items]
Cost of services provided			2
Operating Segments \| O&R \| LPCs
Disaggregation of Revenue [Line Items]
Cost of services provided			4
Operating Segments \| O&R \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	740	771	691
Cost of services provided	759	773	681
Operating Segments \| O&R \| Electric \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	19	2	(10)
Operating Segments \| O&R \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	286	306	265
Cost of services provided	297	312	260
Operating Segments \| O&R \| Gas \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	11	6	(5)
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Cost of services provided	(2)	(6)	(7)
Other \| Other
Disaggregation of Revenue [Line Items]
Cost of services provided	$ (2)	$ (6)	$ (7)

Related Party Transactions - Summary of Costs of Administrative and Other Services Provided and Received (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Cost of services provided	$ 14,663	$ 15,670	$ 13,676
Cost of services received	12,332	13,046	10,850
CECONY
Related Party Transaction [Line Items]
Cost of services provided	13,476	13,268	11,716
Cost of services received	11,299	11,133	9,256
CECONY \| Related Party
Related Party Transaction [Line Items]
Cost of services provided	146	135	137
Cost of services received	$ 82	$ 75	$ 68

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net Income	$ 2,516	$ 1,600	$ 1,193
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	2,031	2,056	2,032
Impairment of assets	0	0	443
Deferred income taxes	132	435	133
Rate case amortization and accruals	92	73	(16)
Net derivative (gains)/losses	12	(181)	(53)
Pre-tax gain on sale of the Clean Energy Businesses	(865)	0	0
Other non-cash items, net	(90)	90	127
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(275)	(285)	(411)
Unbilled revenue and net unbilled revenue deferrals	(48)	(96)	(53)
Allowance for uncollectible accounts – customers	38	5	169
Materials and supplies, including fuel oil and gas in storage	38	(111)	(82)
Revenue decoupling mechanism receivable	(39)	26	(53)
Other receivables and other current assets	141	(21)	(157)
Prepayments	(200)	26	(24)
Accounts payable	(285)	558	44
Pensions and retiree benefits obligations, net	(201)	176	266
Pensions and retiree benefits contributions	(33)	(39)	(472)
Accrued taxes	(13)	7	(46)
Accrued interest	(7)	42	4
Superfund and environmental remediation costs	(12)	(22)	(10)
Distributions from equity investments	31	20	18
Deferred charges, noncurrent assets, leases, net and other regulatory assets	(1,216)	(870)	(496)
Deferred credits, noncurrent liabilities and other regulatory liabilities	196	445	258
Other current liabilities	213	1	(81)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,156	3,935	2,733
INVESTING ACTIVITIES
Utility construction expenditures	(4,353)	(3,824)	(3,630)
Cost of removal less salvage	(387)	(337)	(323)
Non-utility construction expenditures	(141)	(344)	(323)
Proceeds from sale of the Clean Energy Businesses, net of cash and cash equivalents sold	3,927	0	629
Divestiture of renewable electric projects	0	0	183
Other investing activities	(49)	(60)	(20)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,003)	(4,565)	(3,484)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(752)	1,702	(382)
Issuance of long-term debt	2,050	800	2,804
Retirement of long-term debt	(710)	(406)	(1,960)
Debt issuance costs	(32)	(13)	(40)
Common stock dividends	(1,096)	(1,089)	(1,030)
Issuance of common shares - public offering	0	0	775
Issuance of common shares for stock plans	56	57	60
Repurchase of common shares	(1,000)	0	0
Distribution to noncontrolling interest	(4)	(37)	(23)
Sale of equity interest	0	0	257
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	(1,488)	1,014	461
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(335)	384	(290)
BALANCE AT BEGINNING OF PERIOD	1,530	1,146	1,436
BALANCE AT END OF PERIOD	1,195	1,530	1,146
Total cash, temporary cash investments and restricted cash	1,195	1,530	1,146
LESS: CHANGE IN CASH BALANCES HELD FOR SALE	5	248	0
BALANCE AT END OF PERIOD EXCLUDING HELD FOR SALE	1,190	1,282	1,146
Cash paid during the period for:
Interest	987	900	924
Income taxes	397	47	9
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	598	681	457
Issuance of common shares for dividend reinvestment	31	31	49
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	0	2	23
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 11	$ 17	$ 22

Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	$ 5,328.0	$ 6,027.0
Regulatory liabilities—current	145.0	374.0
Total Regulatory Liabilities	5,473.0	6,401.0
Regulatory assets	4,607.0	3,974.0
Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1,535.0	1,753.0
Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1,456.0	1,315.0
Unrecognized pension and other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	943.0	1,638.0
Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	284.0	144.0
Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	278.0	204.0
2022 and 2023 late payment charge deferral
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	167.0	127.0
System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	92.0	73.0
Deferred derivative gains - long term
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	49.0	145.0
Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	48.0	69.0
Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	11.0	10.0
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	465.0	549.0
Deferred derivative gains - short term
Regulatory Liabilities [Line Items]
Regulatory liabilities—current	74.0	311.0
Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities—current	71.0	34.0
Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities—current	0.0	29.0
CECONY
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4,818.0	5,481.0
Regulatory liabilities—current	107.0	308.0
Regulatory assets	4,314.0	3,669.0
CECONY \| Arrears Relief Program Deferral [Member]
Regulatory Liabilities [Line Items]
Regulatory assets	398.6	93.5
CECONY \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4,818.0	5,481.0
Regulatory liabilities—current	107.0	308.0
Total Regulatory Liabilities	4,925.0	5,789.0
Regulatory assets	4,314.0	3,669.0
CECONY \| Future income tax \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1,404.0	1,616.0
CECONY \| Allowance for cost of removal less salvage \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1,266.0	1,137.0
CECONY \| Unrecognized pension and other postretirement costs \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	867.0	1,536.0
CECONY \| Pension and other postretirement benefit deferrals \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	233.0	98.0
CECONY \| Net unbilled revenue deferrals \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	278.0	204.0
CECONY \| 2022 and 2023 late payment charge deferral \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	161.0	123.0
CECONY \| System benefit charge carrying charge \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	88.0	69.0
CECONY \| Deferred derivative gains - long term \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	49.0	130.0
CECONY \| Net proceeds from sale of property \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	47.0	69.0
CECONY \| Settlement of prudence proceeding \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	11.0	10.0
CECONY \| Other \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	414.0	489.0
CECONY \| Deferred derivative gains - short term \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities—current	71.0	287.0
CECONY \| Refundable energy costs \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities—current	36.0	0.0
CECONY \| Revenue decoupling mechanism \| Subsidiaries
Regulatory Liabilities [Line Items]
Regulatory liabilities—current	0.0	21.0
O&R \| Arrears Relief Program Deferral [Member]
Regulatory Liabilities [Line Items]
Regulatory assets	$ 2.1	$ 2.6

Variable Interest Entities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) project	Dec. 31, 2018	Mar. 01, 2023 USD ($) solarProject	Jun. 30, 2021 USD ($)
Variable Interest Entity [Line Items]
Number of solar projects	2		2
Clean Energy Businesses
Variable Interest Entity [Line Items]
Equity method investment	$ 0		$ 20,000,000	$ 11,000,000
Loss from the project, pre-tax	14,000,000
Loss from the project, after-tax	$ 10,000,000
Variable Interest Entity, Primary Beneficiary \| Clean Energy Businesses \| Tax Equity Projects \| Con Edison
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)		100.00%

Other Postretirement Benefits - Schedule of Actuarial Assumptions (Details) - Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets (percent)	6.80%	6.80%	6.80%
CECONY
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligations (percent)	5.05%	5.35%	2.75%
Discount rate, net periodic benefit cost (percent)	5.35%	2.75%	2.25%
O&R
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligations (percent)	5.15%	5.45%	3.00%
Discount rate, net periodic benefit cost (percent)	5.45%	3.00%	2.55%

Short-Term Borrowing (Details)	1 Months Ended		12 Months Ended
Short-Term Borrowing (Details)	Mar. 31, 2023 USD ($) project	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Short-term Debt [Line Items]
Commercial paper, outstanding			$ 2,288,000,000	$ 2,640,000,000
Weighted average interest rate (percent)			5.60%	4.80%
Loans outstanding under credit agreement			$ 0	$ 0
Maximum ratio of consolidated debt to consolidated total capital			0.54
Failure to pay, maximum aggregate limit			$ 150,000,000	150,000,000
Maximum
Short-term Debt [Line Items]
Maximum ratio of consolidated debt to consolidated total capital			0.65
Revolving Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
Letters of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	900,000,000
CECONY
Short-term Debt [Line Items]
Commercial paper, outstanding			$ 1,903,000,000	$ 2,300,000,000
Weighted average interest rate (percent)			5.60%	4.80%
Maximum ratio of consolidated debt to consolidated total capital			0.55
March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement \| Revolving Credit \| Subsidiaries
Short-term Debt [Line Items]
Debt term (in years)		364 days
Credit Availability Through March 2028 \| Revolving Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	800,000,000
Credit Availability Through March 2028 \| CECONY \| Revolving Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 2,500,000,000
Debt instrument, number of extensions to debt term \| project	2
Debt term (in years)	1 year
March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement \| Revolving Credit \| Subsidiaries
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 500,000,000
Debt term (in years)	364 days

Income Tax - Schedule of Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax liabilities:
Property basis differences	$ 8,542	$ 8,770
Regulatory Assets:
System peak reduction and energy efficiency programs	297	220
Environmental remediation costs	310	278
Other regulatory assets	632	561
Unrecognized pension and other postretirement costs	0	22
Pensions and retiree benefits – asset	918	917
Operating lease right-of-use asset	154	230
Equity investments	0	26
Total deferred tax liabilities	10,853	11,024
Deferred tax assets:
Unrecognized pension and other postretirement costs	265	447
Future income tax	427	489
Other regulatory liabilities	844	860
Tax credits carryforward	270	767
Loss carryforwards	7	117
Valuation allowance	(7)	(18)
Superfund and other environmental costs	314	280
Operating lease liabilities	154	233
Pensions and retiree benefits – liability	167	162
Asset retirement obligations	146	153
Equity investments	98	0
Other	125	14
Total deferred tax assets	2,810	3,504
Net deferred tax liabilities	8,043	7,520
Unamortized investment tax credits	26	121
Net deferred tax liabilities and unamortized investment tax credits	8,069	7,641
CECONY
Deferred tax liabilities:
Property basis differences	8,001	7,475
Regulatory Assets:
System peak reduction and energy efficiency programs	291	219
Environmental remediation costs	287	254
Other regulatory assets	577	501
Unrecognized pension and other postretirement costs	0	22
Pensions and retiree benefits – asset	894	894
Operating lease right-of-use asset	153	163
Equity investments	0	0
Total deferred tax liabilities	10,203	9,528
Deferred tax assets:
Unrecognized pension and other postretirement costs	244	431
Future income tax	394	454
Other regulatory liabilities	744	739
Tax credits carryforward	0	0
Loss carryforwards	0	24
Valuation allowance	0	0
Superfund and other environmental costs	288	254
Operating lease liabilities	153	162
Pensions and retiree benefits – liability	153	148
Asset retirement obligations	146	140
Equity investments	0	0
Other	108	45
Total deferred tax assets	2,230	2,397
Net deferred tax liabilities	7,973	7,131
Unamortized investment tax credits	11	13
Net deferred tax liabilities and unamortized investment tax credits	$ 7,984	$ 7,144

Income Tax

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Tax

The components of income tax are as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
State
Current	$179	$5	$14	$(102)	$—	$1
Deferred	6	324	79	246	110	106
Federal
Current	176	58	43	(95)	170	121
Deferred	237	117	61	311	(23)	21
Amortization of investment tax credits	(111)	(6)	(7)	(2)	(2)	(3)
Total income tax expense	$487	$498	$190	$358	$255	$246

Reconciliation of the difference between income tax expense and the amount computed by applying the prevailing statutory income tax rate to income before income taxes is as follows:


	Con Edison						CECONY
(% of Pre-tax income)	2023		2022		2021		2023		2022		2021
STATUTORY TAX RATE
Federal	21	%	21	%	21	%	21	%	21	%	21	%
Changes in computed taxes resulting from:
State income taxes, net of federal income taxes	5		6		4		5		5		5
Taxes attributable to noncontrolling interests	—		1		3		—		—		—
Cost of removal	1		1		2		2		1		1
Other plant-related items	—		—		(1)		(1)		(1)		(1)


Amortization of excess deferred federal income taxes	(6)		(9)		(12)		(8)		(10)		(11)
Renewable energy credits	—		(2)		(2)		—		—		—
Research and development credits	—		—		(1)		—		—		—
Other	—		—		—		(1)		—		—
Impacts from the sale of the Clean Energy Businesses:
Changes in state apportionments, net of federal income taxes	(1)		6		—		—		—		—
Deferred unamortized ITC recognized on sale of subsidiary	(4)		—		—		—		—		—
Effective tax rate	16	%	24	%	14	%	18	%	16	%	15	%

Con Edison’s effective tax rate decreased 8 percent in 2023 primarily due to tax benefits from the recognition of deferred unamortized investment tax credits and the absence of the remeasurement of state deferred income taxes on the announced sale of the Clean Energy Businesses recognized in 2022, offset in part by higher income before income tax expense in 2023 due to the gain on the sale of the Clean Energy Businesses and lower renewable energy tax credits due to the sale.

On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses, which was accounted for as a stock sale for GAAP purposes and a deemed sale of assets and liquidation for tax purposes. Con Edison's pre-tax gain on the sale of the Clean Energy Businesses was $865 million ($767 million, net of tax) for the year ended December 31, 2023. The sale included all assets, operations and projects of the Clean Energy Businesses with the exception of tax equity interests and a deferred project, that were treated as distributions to Con Edison. See Note W and Note X.

The tax effects of temporary differences, which gave rise to deferred tax assets and liabilities, are as follows:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Deferred tax liabilities:
Property basis differences	$8,542	$8,770	$8,001	$7,475
Regulatory Assets:

System peak reduction and energy efficiency programs	297	220	291	219
Environmental remediation costs	310	278	287	254
Other regulatory assets	632	561	577	501
Unrecognized pension and other postretirement costs	—	22	—	22
Pensions and retiree benefits – asset	918	917	894	894
Operating lease right-of-use asset	154	230	153	163
Equity investments	—	26	—	—


Total deferred tax liabilities	$10,853	$11,024	$10,203	$9,528
Deferred tax assets:
Regulatory liabilities:
Unrecognized pension and other postretirement costs	265	447	244	431
Future income tax	427	489	394	454
Other regulatory liabilities	844	860	744	739
Tax credits carryforward	270	767	—	—
Loss carryforwards	7	117	—	24
Valuation allowance	(7)	(18)	—	—
Superfund and other environmental costs	314	280	288	254
Operating lease liabilities	154	233	153	162
Pensions and retiree benefits – liability	167	162	153	148
Asset retirement obligations	146	153	146	140
Equity investments	98	—	—	—
Other	125	14	108	45
Total deferred tax assets	2,810	3,504	2,230	2,397
Net deferred tax liabilities	$8,043	$7,520	$7,973	$7,131
Unamortized investment tax credits	26	121	11	13
Net deferred tax liabilities and unamortized investment tax credits	$8,069	$7,641	$7,984	$7,144

At December 31, 2023, Con Edison has $270 million in general business tax credit carryovers (primarily renewable energy tax credits). If unused, these general business tax credit carryovers will begin to expire in 2038. A deferred tax asset for these tax attribute carryforwards was recorded, and no valuation allowance was provided, as it is more likely than not that the deferred tax asset will be realized.

At December 31, 2023, Con Edison has a deferred tax asset on its New York City net operating loss carryforward of $8 million that will begin to expire, if unused, in 2035. Con Edison recorded a full valuation allowance against this deferred tax asset as it is not more likely than not that the deferred tax assets will be realized.

At December 31, 2022, the Clean Energy Businesses had a deferred tax asset on non New York net operating losses of $43 million, with a valuation allowance of $9 million against the deferred tax assets. During the year ended December 31, 2023, $26 million of deferred tax assets on state net operating losses were utilized as a result of the sale of the Clean Energy Businesses with $17 million of deferred taxes remaining which are not expected to be utilized. Con Edison has written off the $17 million and the related $9 million valuation allowance as these deferred tax assets will not be realized due to the sale of the Clean Energy Businesses.

In April 2023, the IRS released Revenue Procedure 2023-15, which provides a safe harbor method of accounting that taxpayers may use to determine whether certain expenditures to maintain, repair, replace, or improve natural gas transmission and distribution property must be capitalized as improvements by the taxpayer or currently deducted for federal income tax purposes. This revenue procedure also provides procedures for taxpayers to obtain automatic consent to change their method of accounting to the safe harbor method of accounting permitted by this revenue procedure. Con Edison recorded an increase in accumulated plant-related deferred tax liabilities of $228 million ($204 million for CECONY) to reflect the cumulative impact of this change in accounting method for the Utilities.

In May 2023, New York State passed a law that extended the increase in the corporate franchise tax rate from 6.5 percent to 7.25 percent for another three-year period, through tax year 2026, for taxpayers with taxable income greater than $5 million. The law also temporarily extended the business capital tax through tax year 2026, not to exceed an annual maximum tax liability of $5 million per taxpayer, with a corporation paying the higher of its franchise or income tax liability during the same period. New York State also passed a law establishing a permanent rate of 30 percent for the metropolitan transportation business tax surcharge. As a result of the sale of the Clean Energy Businesses in 2023, Con Edison has New York State taxable income in excess of $5 million after using its entire New York State Net Operating Loss carryforward, and therefore, the group is subject to the higher 7.25 percent rate (9.425 percent with the surcharge rate) on its taxable income for tax year 2023. As a result of this legislation, CECONY remeasured its deferred tax assets and liabilities that would reverse before 2027 and recorded state deferred income tax expense (net of federal benefit) and an increase in accumulated deferred tax liabilities of $10 million for the year ended December 31, 2023.

Uncertain Tax Positions

Under the accounting rules for income taxes, the Companies are not permitted to recognize the tax benefit attributable to a tax position unless such position is more likely than not to be sustained upon examination by taxing authorities, including resolution of any related appeals and litigation processes, based solely on the technical merits of the position.

A reconciliation of the beginning and ending amounts of unrecognized tax benefits for Con Edison and CECONY follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Balance at January 1,	$23	$17	$14	$8	$5	$3
Additions based on tax positions related to the current year	8	3	3	4	2	2
Additions based on tax positions of prior years	3	6	2	1	1	1
Reductions for tax positions of prior years	(11)	(1)	(2)	(6)	—	(1)
Settlements	(12)	(2)	—	—	—	—
Balance at December 31,	$11	$23	$17	$7	$8	$5

At December 31, 2023, the estimated uncertain tax positions for Con Edison was $11 million ($7 million for CECONY). For the year ended December 31, 2023, Con Edison recognized $8 million ($4 million for CECONY) of income tax expense related to current year positions, and recognized a tax benefit of $8 million ($5 million for CECONY) related to positions in prior years. In 2023, Con Edison settled with the IRS on the research and development credits related to the Clean Energy Businesses for the 2020-2021 tax years resulting in a reduction in the liability for general business credit carryovers of $12 million, for which an uncertain tax position had previously been recorded. In addition, CECONY reversed $6 million in uncertain tax positions related to the same tax years that reduced its effective tax rate. Con Edison and CECONY reasonably expect to resolve within the next twelve months approximately $3 million of various federal uncertainties due to the expected completion of ongoing tax examinations, of which the entire amount, if recognized, would reduce their effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $11 million ($10 million, net of federal taxes) with $7 million attributable to CECONY.

The Companies recognize interest on liabilities for uncertain tax positions in interest expense and would recognize penalties, if any, in operating expenses in the Companies’ consolidated income statements. In 2023, 2022 and 2021, the Companies recognized an immaterial amount of interest expense and no penalties for uncertain tax

positions in their consolidated income statements. At December 31, 2023 and December 31, 2022, the Companies recognized an immaterial amount of accrued interest on their consolidated balance sheets.

In October 2023, Con Edison reached a settlement with New York State and closed its open examinations for the 2010-2014 tax years and paid $6 million in interest and $4 million in income taxes after applying the remaining $12 million of a special deposit made in 2013.

Con Edison’s federal tax return for 2022 remains under examination. State and local tax returns remain open for examination in New York State for tax years 2015 through 2022, in New Jersey for tax years 2019 through 2022 and in New York City for tax years 2019 through 2022.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

Income Tax - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Mar. 01, 2023	Oct. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Increase to net deferred income tax liabilities			$ 228
Effective income tax rate reconciliation, increase (decrease), percent (in percent)			(8.00%)
Gain (loss) on disposition of stock in subsidiary	$ 865
Gain (loss) on disposition of stock in subsidiary, after tax	$ 767
Deferred tax asset, valuation allowance			$ 7	$ 18
Increase (decrease) in income taxes payable			$ (228)
State income tax rate (in percent)			5.00%	6.00%	4.00%
Unrecognized tax benefits			$ 11	$ 23	$ 17	$ 14
Additions based on tax positions related to the current year			8	3	$ 3
Unrecognized tax benefits, increase (decrease) resulting from prior period tax positions			(8)
Effective income tax rate reconciliation, uncertainty of taxes			3
Unrecognized tax benefits, period increase (decrease)			(12)
Unrecognized tax benefits, net			10
Dividends and interest paid		$ 6
Income taxes paid		4
Deposit applied to income taxes		$ 12
Clean Energy Businesses
Operating Loss Carryforwards [Line Items]
Deferred tax assets			17
Deferred tax asset, valuation allowance			9
Deferred tax assets, operating loss carryforwards, state and local			26
General Business Tax Credit
Operating Loss Carryforwards [Line Items]
Tax credit carryovers			270
State \| New York State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards				43
Deferred tax asset, valuation allowance				9
Expected taxable income minimum			$ 5
State income tax rate (in percent)			7.25%
State \| New York City
Operating Loss Carryforwards [Line Items]
Deferred tax assets			$ 8
State \| Metropolitan Transportation Authority Subcharge
Operating Loss Carryforwards [Line Items]
State income tax rate (in percent)			9.425%
CECONY
Operating Loss Carryforwards [Line Items]
Increase to net deferred income tax liabilities			$ 204
Deferred tax asset, valuation allowance			0	$ 0
Increase (decrease) in income taxes payable			$ (204)
State income tax rate (in percent)			5.00%	5.00%	5.00%
Unrecognized tax benefits			$ 7	$ 8	$ 5	$ 3
Additions based on tax positions related to the current year			4	$ 2	$ 2
Uncertain tax positions, reversed			6
CECONY \| Subsidiaries
Operating Loss Carryforwards [Line Items]
Increase (decrease) in deferred tax liabilities			10
Unrecognized tax benefits			7
Additions based on tax positions related to the current year			4
Unrecognized tax benefits, increase (decrease) resulting from prior period tax positions			$ (5)

Capitalization - Dividends (Details)	12 Months Ended
Capitalization - Dividends (Details)	Dec. 31, 2023
Debt Disclosure [Abstract]
Percentage limitation for income available for dividends (not more than)	100.00%
Rolling average calculation of income available for dividends (years)	2 years

Asset Retirement Obligations

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

The Companies recognize a liability at fair value for legal obligations associated with the retirement of long-lived assets in the period in which they are incurred, or when sufficient information becomes available to reasonably estimate the fair value of such legal obligations. When the liability is initially recorded, asset retirement costs are capitalized by increasing the carrying amount of the related asset. The liability is accreted to its present value each period and the capitalized cost is depreciated over the useful life of the related asset. The fair value of the asset retirement obligation liability is measured using expected future cash flows discounted at credit-adjusted risk-free rates, historical information, and where available, quoted prices from outside contractors. The Companies evaluate these assumptions underlying the asset retirement obligation liability on an annual basis or as frequently as needed.

The Companies recorded asset retirement obligations associated with the removal of asbestos and asbestos-containing material in their buildings (other than the structures enclosing generating stations and substations), electric equipment and steam and gas distribution systems. The Companies also recorded asset retirement obligations relating to gas and oil pipelines abandoned in place and municipal infrastructure support.

The Companies did not record an asset retirement obligation for the removal of asbestos associated with the structures enclosing generating stations and substations. For these building structures, the Companies were unable to reasonably estimate their asset retirement obligations because the Companies were unable to estimate the undiscounted retirement costs or the retirement dates and settlement dates. The amount of the undiscounted retirement costs could vary considerably depending on the disposition method for the building structures, and the method has not been determined. The Companies anticipate continuing to use these building structures in their businesses for an indefinite period, and so the retirement dates and settlement dates are not determinable.

Con Edison recorded asset retirement obligations for the removal of the Clean Energy Businesses’ solar and wind equipment related to projects located on property that is not owned by them and the term of the arrangement is finite including any renewal options. Con Edison did not record asset retirement obligations for the Clean Energy Businesses’ projects that were located on property that was owned by them because they expect that the equipment will continue to generate electricity at these facilities long past the manufacturer’s warranty at minimal operating expense. Therefore, Con Edison was unable to reasonably estimate the retirement date of this equipment. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

The Utilities include in depreciation rates the estimated removal costs, less salvage, for utility plant assets. The amounts related to removal costs that are associated with asset retirement obligations are classified as an asset retirement liability. Pursuant to accounting rules for regulated operations, future removal costs that do not represent legal asset retirement obligations are recorded as regulatory liabilities. Accretion and depreciation expenses related to removal costs that represent legal asset retirement obligations are applied against the Companies’ regulatory liabilities. Asset retirement costs that are recoverable from customers are recorded as regulatory liabilities to reflect the timing difference between costs recovered through the rate-making process and recognition of costs.

The following table represents the balance of asset retirement obligations as of December 31, 2023 and 2022, and changes to the obligation for the years then ended:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Beginning Balance as of January 1,	$500	$577	$499	$504
ARO held for sale (a)	—	(77)	—	—
Changes in estimated cash flows	76	44	75	43
Accretion expense	17	18	17	14
Liabilities settled	(71)	(62)	(71)	(62)
Ending Balance as of December 31, (b)	$522	$500	$520	$499

Regulatory Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Nov. 30, 2021	Jan. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2021
CECONY \| Electric \| NYSPSC
Public Utilities, General Disclosures [Line Items]
Amount of cost recovery	$ 43.0				$ 62.0
CECONY \| Gas \| NYSPSC
Public Utilities, General Disclosures [Line Items]
Amount of cost recovery	$ 7.0				11.0
O&R \| NYSPSC
Public Utilities, General Disclosures [Line Items]
Amount of cost recovery					$ 2.0	$ 1.7
Subsidiaries \| CECONY \| COVID-19 Arrears Assistance Program
Public Utilities, General Disclosures [Line Items]
Government Assistance Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag				credits
Government assistance			$ 352.3	$ 359.9
Subsidiaries \| O&R \| COVID-19 Arrears Assistance Program
Public Utilities, General Disclosures [Line Items]
Government Assistance Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag				credits
Government assistance			2.9	$ 6.1
Subsidiaries \| COVID-19 \| CECONY \| Electric and Gas Transmission Projects
Public Utilities, General Disclosures [Line Items]
Government assistance			13.2	164.5
Income tax rate reconciliation, tax credit			11.5	80.0
Subsidiaries \| COVID-19 \| CECONY \| Electric and Gas Transmission Projects \| COVID-19 Arrears Phase 1 Assistance Program
Public Utilities, General Disclosures [Line Items]
Government assistance				108.4
Subsidiaries \| COVID-19 \| CECONY \| Electric and Gas Transmission Projects \| COVID-19 Arrears Phase 2 Assistance Program
Public Utilities, General Disclosures [Line Items]
Government assistance			327.6
Subsidiaries \| COVID-19 \| O&R \| Electric and Gas Transmission Projects
Public Utilities, General Disclosures [Line Items]
Government assistance				1.6
Income tax rate reconciliation, tax credit			0.7	1.3
Subsidiaries \| COVID-19 \| O&R \| Electric and Gas Transmission Projects \| COVID-19 Arrears Phase 1 Assistance Program
Public Utilities, General Disclosures [Line Items]
Government assistance			0.1	3.2
Subsidiaries \| COVID-19 \| O&R \| Electric and Gas Transmission Projects \| COVID-19 Arrears Phase 2 Assistance Program
Public Utilities, General Disclosures [Line Items]
Government assistance			$ 2.1
Subsidiaries \| COVID-19 \| Consolidated Edison Company of New York, Inc. And Orange And Rockland Utilities, Inc.
Public Utilities, General Disclosures [Line Items]
Reserve for customer arrearages				$ 7.0
Summer Cooling Credit Program \| Subsidiaries \| Residential Customers \| COVID-19 \| CECONY
Public Utilities, General Disclosures [Line Items]
Expected deferred revenue							$ 63.4
Cost of the program, recovery period		5 years

Leases - Lease Cost and Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 70	$ 88	$ 86
Operating lease cash flows	68	83	80
CECONY
Lessee, Lease, Description [Line Items]
Operating lease cost	66	67	66
Operating lease cash flows	$ 65	$ 64	$ 63

Summary of Significant Accounting Policies and Other Matters - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	May 31, 2021	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Supplemental retirement income plan assets	$ 524	$ 459
Deferred income plan assets	99	93
Other	3	2
Total investments	$ 999	841
NY Transco \| Payment Guarantee by CET Electric of Contributions to New York Transco LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage	45.70%
NY Transco - Propel NY Energy Project \| Payment Guarantee by CET Electric of Contributions to New York Transco LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage	41.70%
CECONY
Schedule of Equity Method Investments [Line Items]
Supplemental retirement income plan assets	$ 502	439
Deferred income plan assets	99	93
Other	7	7
Total investments	608	539
Mountain Valley Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investment	530	530
Mountain Valley Pipeline \| CET Gas
Schedule of Equity Method Investments [Line Items]
Equity method investment				$ 530
Aggregate project cost			$ 7,200
Mountain Valley Pipeline \| Con Edison Transmission
Schedule of Equity Method Investments [Line Items]
Equity method investment	144	111
Mountain Valley Pipeline \| Con Edison Transmission \| CECONY
Schedule of Equity Method Investments [Line Items]
Equity method investment	0	0
New York Transco, LLC \| Con Edison Transmission
Schedule of Equity Method Investments [Line Items]
Equity method investment	221	176
New York Transco, LLC \| Con Edison Transmission \| CECONY
Schedule of Equity Method Investments [Line Items]
Equity method investment	0	0
Virginia Tax Equity Project
Schedule of Equity Method Investments [Line Items]
Equity method investment	8	0
Virginia Tax Equity Project \| CECONY
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 0	$ 0

Other Postretirement Benefits - Net Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14	$ 18	$ 22
Interest cost on accumulated other postretirement benefit obligation	57	35	33
Expected return on plan assets	(70)	(72)	(68)
Recognition of net actuarial loss/(gain)	(16)	(14)	31
Recognition of prior service credit	(2)	(1)	(3)
TOTAL PERIODIC POSTRETIREMENT BENEFIT COST/(CREDIT)	(17)	(34)	15
Cost capitalized	(6)	(8)	(9)
Reconciliation to rate level	4	29	(7)
Total credit recognized	(19)	(13)	(1)
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost	12	15	16
Interest cost on accumulated other postretirement benefit obligation	49	30	28
Expected return on plan assets	(56)	(58)	(56)
Recognition of net actuarial loss/(gain)	(8)	(9)	27
Recognition of prior service credit	0	0	(1)
TOTAL PERIODIC POSTRETIREMENT BENEFIT COST/(CREDIT)	(3)	(22)	14
Cost capitalized	(5)	(7)	(7)
Reconciliation to rate level	(2)	24	(12)
Total credit recognized	$ (10)	$ (5)	$ (5)

Summary of Significant Accounting Policies and Other Matters (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The Companies’ consolidated financial statements include the accounts of their respective majority-owned subsidiaries, and variable interest entities (see Note S), as required. All intercompany balances and intercompany transactions have been eliminated.
Accounting Policies	Accounting Policies The accounting policies of Con Edison and its subsidiaries conform to generally accepted accounting principles in the United States of America (GAAP). For the Utilities, these accounting principles include the accounting rules for regulated operations and the accounting requirements of the Federal Energy Regulatory Commission (FERC) and the state regulators having jurisdiction. The accounting rules for regulated operations specify the economic effects that result from the causal relationship of costs and revenues in the rate-regulated environment and how these effects are to be accounted for by a regulated enterprise. Revenues intended to cover some costs may be recorded either before or after the costs are incurred. If regulation provides assurance that incurred costs will be recovered in the future, these costs would be recorded as deferred charges or “regulatory assets” under the accounting rules for regulated operations. If revenues are recorded for costs that are expected to be incurred in the future, these revenues would be recorded as deferred credits or “regulatory liabilities” under the accounting rules for regulated operations. The Utilities’ principal regulatory assets and liabilities are detailed in Note B. In general, the Utilities are receiving or being credited with a return on their regulatory assets for which a cash outflow has been made, and are paying or being charged with a return on their regulatory liabilities for which a cash inflow has been received. The Utilities’ regulatory assets and liabilities at December 31, 2023 are recoverable from customers, or to be applied for customer benefit, in accordance with rate provisions that have been approved by state regulators.
Revenues	Revenues CECONY’s electric and gas rate plans and O&R’s New York electric and gas rate plans each contain a revenue decoupling mechanism, that covers all residential and most commercial customers, under which the company’s actual energy delivery revenues are compared with the authorized delivery revenues and the difference accrued, with interest, for refund to, or recovery from, customers, as applicable. See “Rate Plans” in Note B. The NYSPSC requires utilities to record gross receipts tax revenues and expenses on a gross income statement presentation basis (i.e., included in both revenue and expense). The recovery of these taxes is generally provided for in the revenue requirement within each of the respective NYSPSC-approved rate plans.
Plant and Depreciation Utility Plant / Non-Utility Plant	Plant and Depreciation Utility Plant Utility plant is stated at original cost. The cost of repairs and maintenance is charged to expense and the cost of betterments is capitalized. The capitalized cost of additions to utility plant includes indirect costs such as engineering, supervision, payroll taxes, pensions, other benefits and an allowance for funds used during construction (AFUDC). The original cost of property is charged to expense over the estimated useful lives of the assets. Upon retirement, the original cost of property is charged to accumulated depreciation. See Note T. Rates used for AFUDC include the cost of borrowed funds and a reasonable rate of return on the Utilities’ own funds when so used, determined in accordance with regulations of the FERC or the state public utility regulatory authority having jurisdiction. The rate is compounded semiannually, and the amounts applicable to borrowed funds are treated as a reduction of interest charges, while the amounts applicable to the Utilities’ own funds are credited to other income (deductions). The AFUDC rates for CECONY were 5.9 percent, 5.2 percent and 4.5 percent for 2023, 2022 and 2021, respectively. The AFUDC rates for O&R were 6.2 percent, 5.0 percent and 4.8 percent for 2023, 2022 and 2021, respectively. The Utilities generally compute annual charges for depreciation using the straight-line method for financial statement purposes, with rates based on average service lives and net salvage factors. The average depreciation rates for CECONY were 3.6 percent for 2023 and 3.5 percent for 2022 and 3.5 percent for 2021. The average depreciation rates for O&R were 3.1 percent for 2023, 3.0 percent for 2022 and 3.1 percent for 2021. The estimated lives for utility plant for CECONY range from 5 to 80 years for electric, 5 to 90 years for gas, 5 to 80 years for steam and 5 to 55 years for general plant. For O&R, the estimated lives for utility plant range from 5 to 75 years for electric and gas and 5 to 50 years for general plant. Non–Utility Plant Non-utility plant is stated at original cost. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and X. For Con Edison, non-utility plant consisted primarily of the Clean Energy Businesses’ renewable electric projects. Property, plant and equipment are stated at cost, less accumulated depreciation and include capitalized interest during construction. Depreciation is computed under the straight-line method over the useful lives of the assets. Solar power generating assets and wind power generating assets have useful lives of 35 years and 30, respectively. For the Utilities, non-utility plant consists of land and conduit for telecommunication use. Depreciation on non-utility plant, other than land, is computed using the straight-line method for financial statement purposes over their estimated useful lives, which is 10 years.
Long-Lived and Intangible Assets	Long–Lived and Intangible Assets The Companies test long-lived and intangible assets for recoverability when events or changes in circumstances indicate that the carrying value of long-lived or intangible assets may not be recoverable. The carrying amount of a long-lived asset or intangible asset with a definite life is deemed not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the assets. In the event a test indicates that such cash flows cannot be expected to be sufficient to fully recover the assets, the assets are considered impaired and written down to their estimated fair value.
Recoverable Energy Costs/New York Independent System Operator (NYISO)	Recoverable Energy Costs The Utilities generally recover all of their prudently incurred fuel, purchased power and gas costs, including hedging gains and losses, in accordance with rate provisions approved by the applicable state public utility regulators. If the actual energy supply costs for a given month are more or less than the amounts billed to customers for that month, the difference in most cases is recoverable from or refundable to customers. Differences between actual and billed electric and steam supply costs are generally deferred for charge or refund to customers during the next billing cycle (normally within one or two months). For the Utilities’ gas costs, differences between actual and billed gas costs during the 12-month period ending each August are charged or refunded to customers during a subsequent 12-month period. New York Independent System Operator (NYISO) The Utilities purchase electricity through the wholesale electricity market administered by the NYISO. The difference between purchased power and related costs initially billed to the Utilities by the NYISO and the actual cost of power subsequently calculated by the NYISO is refunded by the NYISO to the Utilities, or paid to the NYISO by the Utilities. The reconciliation payments or receipts are recoverable from or refundable to the Utilities’ customers. Certain other payments to or receipts from the NYISO are also subject to reconciliation, with shortfalls or amounts in excess of specified rate allowances recoverable from or refundable to customers. These include proceeds from the sale through the NYISO of transmission rights on CECONY’s transmission system (transmission congestion contracts or TCCs).
Temporary Cash Investments	Temporary Cash Investments Temporary cash investments are short-term, highly-liquid investments that generally have maturities of three months or less at the date of purchase. They are stated at cost, which approximates market. The Companies consider temporary cash investments to be cash equivalents.
Investments	Investments Accounting for Investments Con Edison’s investments consist primarily of the investments of Con Edison Transmission that are accounted for under the equity method and the fair value of the Utilities’ supplemental retirement income plan and deferred income plan assets. The accounting rules require Con Edison to evaluate its investments periodically to determine whether they are impaired. The standard for determining whether an impairment exists and must be recorded is whether an other-than-temporary decline in carrying value has occurred. Changes in economic conditions, forecasted cash flows and the regulatory environment, among other factors, could require equity method investments to recognize a decrease in carrying value for an other-than-temporary decline. When management believes such a decline may have occurred, the fair value of the investment is estimated using market inputs, when observable, or a valuation model such as a discounted cash flow analysis. The fair value is compared to the carrying value of the investment in order to determine the amount of impairment to record, if any. The evaluation and measurement of impairments involve uncertainties. The judgments that Con Edison makes to estimate the fair value of its equity method investments are based on assumptions that management believes are reasonable, and variations in these estimates or the underlying assumptions, or the receipt of additional market information, could have a material impact on whether a triggering event is determined to exist or the amount of any such impairment. Additionally, if the projects in which Con Edison holds these investments recognize an impairment, Con Edison may record a share of that impairment loss and would evaluate its investment for an other-than-temporary decline in carrying value as described above. 2021 Partial Impairment of Investment in Stagecoach Gas Services LLC (Stagecoach) In May 2021, a subsidiary of Con Edison Transmission entered into a purchase and sale agreement pursuant to which the subsidiary and its joint venture partner agreed to sell their combined interests in Stagecoach for a total of $1,225 million, of which $629 million was attributed to Con Edison Transmission for its 50 percent interest. As a result of information made available to Stagecoach as part of the sale process, Stagecoach performed impairment tests that resulted in Stagecoach recording impairment charges of $414 million for the year ended December 31, 2021. Accordingly, Con Edison recorded pre-tax impairment losses on its 50 percent interest in Stagecoach of $212 million ($147 million after-tax), including working capital and transaction cost adjustments, within "Investment income/(loss)" on Con Edison's consolidated income statement for the year ended December 31, 2021. Stagecoach’s impairment charges and information obtained from the sales process constituted triggering events for Con Edison's investment in Stagecoach during 2021. Con Edison evaluated the carrying value of its investment in Stagecoach for other-than-temporary declines in value using income and market-based approaches. Con Edison determined that the carrying value of its investment in Stagecoach of $667 million and $630 million as of March 31, 2021 and June 30, 2021, respectively, was not impaired, and that the carrying value at June 30, 2021 reflected the final sales price received, including closing adjustments. Con Edison Transmission had no remaining investment in Stagecoach as of December 31, 2021. Investment in Mountain Valley Pipeline, LLC (MVP) In January 2016, a subsidiary of Con Edison Transmission, acquired a 12.5 percent interest in MVP, a company developing a proposed 300-mile gas transmission project (the Mountain Valley Pipeline) in West Virginia and Virginia. During 2019, Con Edison exercised its right to limit, and did limit, its cash contributions to the joint venture to approximately $530 million, that reduced Con Edison Transmission's interest in MVP to 11.3 percent, 10.2 percent, and 9.6 percent as of December 31, 2020, 2021, and 2022, respectively. As of December 31, 2023 Con Edison Transmission's interest in MVP is 7.9 percent and is expected to be reduced to approximately 7.0 percent based on Con Edison Transmission's previous capping of its cash contributions. As of December 31, 2023, the Mountain Valley Pipeline was approximately 97 percent complete. During 2020, the uncertainty related to obtaining necessary water crossing permits, the resulting costs and the likelihood of the Mountain Valley Pipeline not reaching eventual completion increased as a result of actions taken by the U.S. Court of Appeals for the Fourth Circuit. This action and associated delays constituted a triggering event (the "2020 triggering event") that required Con Edison to test its investment in MVP for an other-than-temporary impairment as of December 31, 2020. In December 2021, the VA Department of Environmental Quality and the WV Department of Environmental Protection both issued water quality certification permits which are required in order for the U.S. Army Corps of Engineers to proceed with the permitting process for construction of certain Project water crossings. In January 2022, the U.S. Court of Appeals for the Fourth Circuit rejected permits for crossings through the Jefferson National Forest issued by the U.S. Forest Service and Bureau of Land Management. In February 2022, the U.S. Court of Appeals for the Fourth Circuit vacated a biological opinion from the U.S. Fish and Wildlife Service, applicable to all remaining construction. The biological opinion had been issued and was the subject of litigation prior to December 31, 2021. Con Edison believed that the February 2022 action by the U.S. Court of Appeals for the Fourth Circuit, along with the potential outcome of other matters pending before that Court, may lead to further delays and increased project costs, which constituted a triggering event (the “2021 triggering event”) that required Con Edison to test its investment in MVP for an other-than-temporary impairment as of December 31, 2021. In response to the 2020 triggering event and 2021 triggering event, Con Edison assessed the value of its equity investment in the Mountain Valley Pipeline to determine whether the fair value of its investment in MVP had declined below its carrying value on an other-than-temporary basis as of December 31, 2020 and 2021, respectively. The estimated fair value of the investment was determined using a discounted cash flow analysis, which is a level 3 fair value measurement. The analysis discounted probability-weighted future cash flows, including revenues based on long-term firm transportation contracts, that are secured for the first 20 years following completion of the Mountain Valley Pipeline. See Note U. Con Edison had also assumed cash flows extending beyond this period. All cash flows were discounted at a pre-tax discount rate of 8.3 percent and then weighted based on Con Edison’s estimate of the likelihood that the Mountain Valley Pipeline will be completed. For the 2020 triggering event, Con Edison estimated that the likelihood of project completion was in the upper end of a reasonably possible range. For the 2021 triggering event, Con Edison anticipated that the Mountain Valley Pipeline faced legal and regulatory challenges that could have made construction completion increasingly remote. The likelihood that the project will be completed and, for 2020, the discount rate, were the most significant and sensitive assumptions; changes in these assumptions may have materially changed the results of the impairment calculation. Based on the discounted cash flow analyses, Con Edison concluded as of December 31, 2020 and 2021 that the fair value of its investment in MVP declined below its carrying value and the declines were other-than-temporary. Accordingly, Con Edison recorded a pre-tax impairment loss of $320 million ($223 million, after tax) for the year ended December 31, 2020 that reduced the carrying value of its investment in MVP from $662 million to $342 million, with an associated deferred tax asset of $53 million. Additionally, Con Edison recorded a pre-tax impairment loss of $231 million ($162 million, after tax) for the year ended December 31, 2021 that reduced the carrying value of its investment in MVP from $342 million to $111 million, with an additional $77 million associated deferred tax asset, totaling a deferred tax asset of $130 million at December 31, 2021 and 2022. The impairments were recorded within “Investment income (loss)” on Con Edison’s Consolidated Income Statement. In addition, Con Edison did not record equity in earnings from allowance for funds used during construction from MVP beginning in January 2021 and refrained from recording such amounts during 2021, 2022 and a portion of 2023 until substantial construction activities resumed. Con Edison recorded equity in earnings from AFUDC from MVP of $33 million for the year ended December 31, 2023 and expects to continue to recognize its proportionate share of equity in earnings from AFUDC until the project is placed in service, subject to the progression of construction activities. There were no impairments to the carrying value of Con Edison's investment in MVP for the years ended December 31, 2022 and 2023. In June 2023, federal legislation to raise the U.S. debt ceiling included provisions declaring the Mountain Valley Pipeline to be in the national interest, expediting the permitting process and moving jurisdiction of challenges of permits to the D.C. Circuit Court of Appeals, from the 4th Circuit Court of Appeals. These actions enabled construction activities to resume in June 2023 and continue without substantial interruption for the duration of 2023. There is risk that the fair value of Con Edison’s investment in MVP may be further impaired in the future. Assumptions and estimates used to test Con Edison’s investment in MVP for impairment may change if adverse developments impacting the construction of the Mountain Valley Pipeline were to occur.
Pension and Other Postretirement Benefits	Pension and Other Postretirement Benefits The accounting rules for retirement benefits require an employer to recognize an asset or liability for the overfunded or underfunded status of its pension and other postretirement benefit plans. For a pension plan, the asset or liability is the difference between the fair value of the plan’s assets and the projected benefit obligation. For any other postretirement benefit plan, the asset or liability is the difference between the fair value of the plan’s assets and the accumulated postretirement benefit obligation. The accounting rules generally require employers to recognize all unrecognized prior service costs and credits and unrecognized actuarial gains and losses in accumulated other comprehensive income/(loss) (OCI), net of tax. Such amounts will be adjusted as they are subsequently recognized as components of total periodic benefit cost or income pursuant to the current recognition and amortization provisions. For the Utilities’ pension and other postretirement benefit plans, regulatory accounting treatment is generally applied in accordance with the accounting rules for regulated operations. Unrecognized prior service costs or credits and unrecognized actuarial gains and losses are recorded to regulatory assets or liabilities, rather than OCI. See Notes E and F. The total periodic benefit costs are recognized in accordance with the accounting rules for retirement benefits. Investment gains and losses are recognized in expense over a 15-year period and other actuarial gains and losses are recognized in expense over a 10-year period, subject to the deferral provisions in the rate plans. In accordance with the Statement of Policy issued by the NYSPSC and its current electric, gas and steam rate plans, CECONY defers for payment to or recovery from customers the difference between such expenses and the amounts for such expenses reflected in rates. O&R also defers such difference pursuant to its NY rate plans. See Note B. The Companies calculate the expected return on pension and other postretirement benefit plan assets by multiplying the expected rate of return on plan assets by the market-related value (MRV) of plan assets at the beginning of the year, taking into consideration anticipated contributions and benefit payments that are to be made during the year. The accounting rules allow the MRV of plan assets to be either fair value or a calculated value that recognizes changes in fair value in a systematic and rational manner over not more than five years. The Companies use a calculated value when determining the MRV of the plan assets that adjusts for 20 percent of the difference between fair value and expected MRV of plan assets. This calculated value has the effect of stabilizing variability in assets to which the Companies apply the expected return.
Federal Income Tax/State Income Tax	Federal Income Tax In accordance with accounting rules for income taxes, the Companies have recorded an accumulated deferred federal income tax liability at current tax rates for temporary differences between the book and tax basis of assets and liabilities. In accordance with rate plans, the Utilities have recovered amounts from customers for a portion of the tax liability they will pay in the future as a result of the reversal or “turn-around” of these temporary differences. As to the remaining deferred tax liability, the Utilities had established regulatory assets for the net revenue requirements to be recovered from customers for the related future tax expense pursuant to the NYSPSC's 1993 Policy Statement approving accounting procedures consistent with accounting rules for income taxes and providing assurances that these future increases in taxes will be recoverable in rates. Accumulated deferred investment tax credits are amortized ratably over the lives of the related properties and applied as a reduction to future federal income tax expense. Con Edison and its subsidiaries file a consolidated federal income tax return. The consolidated income tax liability is allocated to each member of the consolidated group using the separate return method. Each member pays or receives an amount based on its own taxable income or loss in accordance with a consolidated tax allocation agreement. Tax loss and tax credit carryforwards are allocated among members in accordance with consolidated tax return regulations. State Income Tax Con Edison and its subsidiaries file a combined New York State Corporation Business Franchise Tax Return. Similar to a federal consolidated income tax return, the income of all entities in the combined group is subject to New York State taxation, after adjustments for differences between federal and New York law and apportionment of income among the states in which the company does business. Each member’s share of the New York State tax is based on its own New York State taxable income or loss.
Reclassification	Reclassification Certain prior period amounts have been reclassified to conform with current period presentation.
Earnings Per Common Share	Earnings Per Common Share Con Edison presents basic and diluted earnings per share (EPS) on the face of its consolidated income statement. Basic EPS is calculated by dividing earnings available to common shareholders (“Net income for common stock” on Con Edison’s consolidated income statement) by the weighted average number of Con Edison common shares outstanding during the period. In the calculation of diluted EPS, weighted average shares outstanding are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common stock. Potentially dilutive securities for Con Edison consist of restricted stock units and deferred stock units for which the average market price of the common shares for the period was greater than the exercise price (see Note O).
Estimates	Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
New Financial Accounting Standards	New Financial Accounting Standards In March 2023, the FASB issued amendments to the guidance on accounting for Investments—Equity Method and Joint Ventures (Topic 323) through ASU 2023-02. The amendments would expand the use of the proportional amortization method of income recognition. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations and liquidity. In November 2023, the FASB issued amendments to the guidance on accounting for Segment Reporting (Topic 280) through ASU 2023-07. The amendments would improve the disclosures about a public entity’s reportable segments and address requests from investors for additional, more detailed information about a reportable segment’s expenses. For public entities, the amendments are effective for annual reporting periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. A public entity should apply such amendments retrospectively to all prior periods presented in the financial statements. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations and liquidity. In December 2023, the FASB issued amendments to the guidance on accounting for Income Taxes (Topic 740) through ASU 2023-09. The amendments would improve the disclosures related to income taxes. The amendments focus on three key areas: Rate Reconciliation, Income Taxes Paid, and Income (or loss)/Income tax expense (or benefit) relating to disaggregated continuing operations. For public entities, the amendments are effective for annual reporting periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements. The Companies do not expect the new guidance to have a material impact on their financial position, results of operations and liquidity.

Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Site Contingency [Line Items]
Accrued Liabilities	$ 1,118	$ 997
Regulatory assets	4,888	4,279
Manufactured gas plant sites
Site Contingency [Line Items]
Accrued Liabilities	1,016	876
Other Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	102	121
Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	1,118	997
Regulatory assets	1,105	991
CECONY
Site Contingency [Line Items]
Accrued Liabilities	1,026	903
CECONY \| Manufactured gas plant sites
Site Contingency [Line Items]
Accrued Liabilities	924	782
CECONY \| Other Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	102	121
CECONY \| Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	1,026	903
Regulatory assets	$ 1,022	$ 906

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Pension Benefits - Schedule of Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	$ 459
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	524	$ 459
Pension Benefits
CHANGE IN PROJECTED BENEFIT OBLIGATION
Projected benefit obligation at beginning of year	12,113	17,357	$ 18,965
Service cost – excluding administrative expenses	156	283	337
Interest cost on projected benefit obligation	649	505	471
Net actuarial loss/(gain)	599	(5,102)	(1,547)
Plan amendments	3	0	0
Benefits paid	(808)	(930)	(869)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR	12,712	12,113	17,357
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	14,979	18,504	17,022
Actual return on plan assets	1,261	(2,583)	1,935
Employer contributions	21	30	469
Benefits paid	(808)	(930)	(869)
Administrative expenses	(49)	(42)	(53)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	15,404	14,979	18,504
FUNDED STATUS	2,692	2,866	1,147
Unrecognized net loss/(gain)	(757)	(1,485)	205
Unrecognized prior service credits	(105)	(124)	(140)
Accumulated benefit obligation	11,739	11,167	15,469
CECONY
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	439
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	502	439
CECONY \| Pension Benefits
CHANGE IN PROJECTED BENEFIT OBLIGATION
Projected benefit obligation at beginning of year	11,395	16,341	17,821
Service cost – excluding administrative expenses	146	266	317
Interest cost on projected benefit obligation	611	475	443
Net actuarial loss/(gain)	572	(4,845)	(1,441)
Plan amendments	0	0	0
Benefits paid	(747)	(842)	(799)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR	11,977	11,395	16,341
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	14,248	17,566	16,147
Actual return on plan assets	1,201	(2,453)	1,838
Employer contributions	18	17	432
Benefits paid	(747)	(842)	(799)
Administrative expenses	(46)	(40)	(52)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	14,674	14,248	17,566
FUNDED STATUS	2,697	2,853	1,225
Unrecognized net loss/(gain)	(705)	(1,397)	207
Unrecognized prior service credits	(124)	(143)	(163)
Accumulated benefit obligation	$ 11,031	$ 10,478	$ 14,504

Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Mar. 01, 2023
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 92
Makeup of net credit exposure non-investment grade/non-rated counterparties	83
Makeup of net credit exposure with investment-grade counterparties	2
Makeup of net credit exposure with commodity exchange brokers	7
CECONY
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 90
Makeup of net credit exposure with investment-grade counterparties		$ 1
Makeup of net credit exposure with commodity exchange brokers		$ 6

Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]
General	$ 4,835	$ 4,205
Held for future use	118	117
Construction work in progress	2,442	2,484
NET UTILITY PLANT	49,594	46,752
Electric Generation
Public Utility, Property, Plant and Equipment [Line Items]
Generation	580	534
Electric Transmission
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	4,652	4,223
Electric Distribution
Public Utility, Property, Plant and Equipment [Line Items]
Distribution	24,491	23,345
General
Public Utility, Property, Plant and Equipment [Line Items]
General	141	113
Gas
Public Utility, Property, Plant and Equipment [Line Items]
Gas	12,023	11,326
Steam
Public Utility, Property, Plant and Equipment [Line Items]
Steam	1,990	1,962
General
Public Utility, Property, Plant and Equipment [Line Items]
General	3,158	2,648
CECONY
Public Utility, Property, Plant and Equipment [Line Items]
General	4,530	3,879
Held for future use	110	109
Construction work in progress	2,168	2,268
NET UTILITY PLANT	46,646	44,009
CECONY \| Electric Generation
Public Utility, Property, Plant and Equipment [Line Items]
Generation	580	534
CECONY \| Electric Transmission
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	4,333	3,916
CECONY \| Electric Distribution
Public Utility, Property, Plant and Equipment [Line Items]
Distribution	23,238	22,130
CECONY \| General
Public Utility, Property, Plant and Equipment [Line Items]
General	141	113
CECONY \| Gas
Public Utility, Property, Plant and Equipment [Line Items]
Gas	11,226	10,567
CECONY \| Steam
Public Utility, Property, Plant and Equipment [Line Items]
Steam	1,990	1,962
CECONY \| General
Public Utility, Property, Plant and Equipment [Line Items]
General	$ 2,860	$ 2,410

Electricity and Gas Purchase Agreements - Summary of Capacity, Energy and Other Fixed Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	$ 546	$ 596	$ 552
Astoria Generating Company
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	40	45	20
Brooklyn Navy Yard
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	134	165	139
Gas transportation and storage
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	372	386	393
CECONY
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	501	550	506
CECONY \| Astoria Generating Company
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	40	45	20
CECONY \| Brooklyn Navy Yard
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	134	165	139
CECONY \| Gas transportation and storage
Long-term Contract for Purchase of Electric Power [Line Items]
Capacity, energy and other fixed payments	$ 327	$ 340	$ 347

Consolidated Statement of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Capital Stock Expense	Accumulated Other Comprehensive Income/(Loss)	Non-controlling Interest
BALANCE AS OF BEGINNING OF PERIOD (in shares) at Dec. 31, 2020		342,000,000
BALANCE AS OF BEGINNING OF PERIOD at Dec. 31, 2020	$ 19,065	$ 36	$ 8,808	$ 11,178	$ (1,038)	$ (112)	$ (25)	$ 218
Beginning Balance (in shares) at Dec. 31, 2020					23,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,193			1,346				(153)
Common stock dividends	(1,079)			(1,079)
Issuance of common shares - public offering (in shares)		10,000,000
Issuance of common shares - public offering	766	$ 1	775			(10)
Issuance of common shares for stock plans (in shares)		2,000,000
Issuance of common shares for stock plans	127		127
Other comprehensive income	30						30
Distributions to noncontrolling interests	(23)							(23)
Net proceeds from sale of equity interest	257							257
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2021		354,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2021	20,336	$ 37	9,710	11,445	$ (1,038)	(122)	5	299
Ending Balance (in shares) at Dec. 31, 2021					23,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,600			1,660				(60)
Common stock dividends	(1,120)			(1,120)
Issuance of common shares for stock plans (in shares)		1,000,000
Issuance of common shares for stock plans	93		93
Other comprehensive income	17						17
Distributions to noncontrolling interests	$ (37)							(37)
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2022	354,962,058	355,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2022	$ 20,889	$ 37	9,803	11,985	$ (1,038)	(122)	22	202
Ending Balance (in shares) at Dec. 31, 2022	23,210,700				23,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,516			2,519				(3)
Common stock dividends	(1,127)			(1,127)
Issuance of common shares for stock plans (in shares)		1,000,000
Issuance of common shares for stock plans	89		89
Distributions to noncontrolling interests	$ (4)							(4)
Common stock repurchases (in shares)	(10,543,263)	(11,000,000)			11,000,000
Common stock repurchases	$ (1,010)		(31)		$ (979)
Disposal of Clean Energy Businesses	$ (195)							195
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2023	345,415,772	345,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2023	$ 21,158	$ 37	$ 9,861	$ 13,377	$ (2,017)	$ (122)	$ 22	$ 0
Ending Balance (in shares) at Dec. 31, 2023	33,753,963				34,000,000

Environmental Matters (Tables)

12 Months Ended

Dec. 31, 2023

Environmental Remediation Obligations [Abstract]

Accrued Liabilities and Regulatory Assets

The accrued liabilities and regulatory assets related to Superfund Sites at December 31, 2023 and 2022 were as follows:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Accrued Liabilities:
Manufactured gas plant sites	$1,016	$876	$924	$782
Other Superfund Sites	102	121	102	121
Total	$1,118	$997	$1,026	$903
Regulatory assets	$1,105	$991	$1,022	$906

Environmental Remediation Costs

Environmental remediation costs incurred related to Superfund Sites at December 31, 2023 and 2022 were as follows:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Remediation costs incurred	$13	$21	$12	$20

Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings

The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets or liabilities for the Companies at December 31, 2023 and 2022 were as follows:


	Con Edison		CECONY
(Millions of Dollars)	2023	2022	2023	2022
Accrued liability – asbestos suits	$8	$8	$7	$7
Regulatory assets – asbestos suits	8	8	7	7
Accrued liability – workers’ compensation	56	61	54	59
Regulatory liabilities – workers’ compensation	17	11	17	11

Electricity and Gas Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]
2024
2025
2026
2027
2028
All Years Thereafter
Electricity power purchase agreements
Long-term Contract for Purchase of Electric Power [Line Items]
2024	155
2025	89
2026	59
2027	44
2028	44
All Years Thereafter	346
Natural gas
Long-term Contract for Purchase of Electric Power [Line Items]
2024	299
2025	10
2026	11
2027	7
2028	0
All Years Thereafter	0
Gas transportation and storage
Long-term Contract for Purchase of Electric Power [Line Items]
2024	521
2025	486
2026	460
2027	409
2028	301
All Years Thereafter	2,682
CECONY
Long-term Contract for Purchase of Electric Power [Line Items]
2024
2025
2026
2027
2028
All Years Thereafter
CECONY \| Electricity power purchase agreements
Long-term Contract for Purchase of Electric Power [Line Items]
2024	151
2025	85
2026	58
2027	44
2028	44
All Years Thereafter	346
CECONY \| Natural gas
Long-term Contract for Purchase of Electric Power [Line Items]
2024	258
2025	9
2026	9
2027	6
2028	0
All Years Thereafter	0
CECONY \| Gas transportation and storage
Long-term Contract for Purchase of Electric Power [Line Items]
2024	450
2025	420
2026	398
2027	353
2028	259
All Years Thereafter	$ 2,311

Consolidated Statement of Capitalization - CECONY - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	345	355
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE INCOME	$ 21,136	$ 20,665
Pension plan liability adjustments, net of taxes	23	23
Unrealized losses on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment for unrealized losses included in regulatory assets, net of taxes	(1)	(1)
TOTAL ACCUMULATED OTHER COMPREHENSIVE INCOME, NET OF TAXES	$ 22	$ 22
CECONY
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE LOSS (in shares)	235	235
TOTAL EQUITY BEFORE ACCUMULATED OTHER COMPREHENSIVE INCOME	$ 19,144	$ 16,874
Pension plan liability adjustments, net of taxes	3	5
Unrealized losses on derivatives qualified as cash flow hedges, less reclassification adjustment for gains/(losses) included in net income and reclassification adjustment for unrealized losses included in regulatory assets, net of taxes	(1)	(1)
TOTAL ACCUMULATED OTHER COMPREHENSIVE INCOME, NET OF TAXES	2	4
TOTAL SHAREHOLDER’S EQUITY (See Statement of Shareholder’s Equity)	$ 19,146	$ 16,878

- Definition

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

+ References + Details

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,516	$ 1,600	$ 1,193
LOSS ATTRIBUTABLE TO NON-CONTROLLING INTEREST	3	60	153
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	0	16	30
Other income, net of taxes	0	1	0
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	17	30
COMPREHENSIVE INCOME	$ 2,519	$ 1,677	$ 1,376

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
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-Paragraph 3
-Subparagraph (c)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 40
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-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-8

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-9

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
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-Paragraph 11
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 205
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-Section 45
-Paragraph 3
-Subparagraph (a)
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-URI https://asc.fasb.org//1943274/2147480767/946-205-45-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483581/946-220-45-7

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(16))
-Publisher FASB
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Section S99
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
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+ Details

Stock-Based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

The Companies may compensate employees and directors with, among other things, stock options, stock units, restricted stock units and contributions to the stock purchase plan. Long Term Incentive Plans that were approved by Con Edison’s shareholders in 2003 (2003 LTIP), 2013 (2013 LTIP), and 2023 (2023 LTIP) are collectively referred to herein as the LTIP. The LTIP provides for, among other things, awards to employees of restricted stock units and stock options and, to Con Edison’s non-employee directors, stock units. Existing awards under the 2003 LTIP and the 2013 LTIP continue in effect, however no new awards may be issued under either plan. The 2023 LTIP provides for awards for up to ten million shares of common stock.

During the years ended December 31, 2023, 2022, and 2021, equity awards were granted under the 2013 LTIP. Shares of Con Edison common stock used to satisfy the Companies’ obligations with respect to stock-based compensation may be new shares (authorized, but unissued) or treasury shares (existing treasury shares or shares purchased in the open market). The shares used during the year ended December 31, 2023 were new shares. The Companies intend to use new shares to fulfill their stock-based compensation obligations for 2024.

The Companies recognized stock-based compensation expense using a fair value measurement method. The following table summarizes stock-based compensation expense recognized by the Companies in the years ended December 31, 2023, 2022 and 2021:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Performance-based restricted stock	$41	$52	$23	$36	$43	$19
Time-based restricted stock	2	2	2	2	2	2
Non-employee director deferred stock compensation	3	3	3	3	3	3
Stock purchase plan	7	7	7	7	6	7
Total	$53	$64	$35	$48	$54	$31
Income tax benefit	$15	$18	$10	$13	$15	$9

Restricted Stock and Stock Units

Restricted stock and stock unit awards under the LTIP have been made as follows: (i) awards that provide for adjustment of the number of units (performance-restricted stock units or Performance RSUs) to certain officers and employees; (ii) time-based awards to certain officers and employees; and (iii) awards to non-employee directors. Restricted stock and stock units awarded represent the right to receive, upon vesting, shares of Con Edison common stock, or, except for units awarded under the directors’ plan, the cash value of shares or a combination thereof.

The number of units in each annual Performance RSU award is subject to adjustment as follows: (i) 50 percent of the units awarded will be multiplied by a factor that may range from 0 to 200 percent, based on Con Edison’s total shareholder return relative to a specified peer group during a specified performance period (the TSR portion); and (ii) 50 percent of the units awarded will be multiplied by factors that may range from 0 to 200 percent, based on

determinations made in connection with the Companies’ annual incentive plans or, with respect to certain executive officers, actual performance as compared to certain performance measures during a specified performance period (the non-TSR portion). Performance RSU awards generally vest upon completion of the performance period.

Performance against the established targets is recomputed each reporting period as of the earlier of the reporting date and the vesting date. The TSR portion applies a Monte Carlo simulation model, and the non-TSR portion is the product of the market price at the end of the period and the average non-TSR determination over the vesting period. Performance RSUs are “liability awards” because each Performance RSU represents the right to receive, upon vesting, one share of Con Edison common stock, the cash value of a share or a combination thereof. As such, changes in the fair value of the Performance RSUs are reflected in net income. The assumptions used to calculate the fair value of the awards were as follows:


	2023	2022	2021
Risk-free interest rate (a)	4.06% - 4.64%	4.41% - 4.73%	0.39% -0.73%
Expected term (b)	3 years	3 years	3 years
Expected share price volatility (c)	17.88% - 19.92%	19.65% - 21.77%	17.25% - 31.42%

(a)The risk-free rate is based on the U.S. Treasury zero-coupon yield curve.

(b)The expected term of the Performance RSUs equals the vesting period. The Companies do not expect significant forfeitures to occur.

(c)Based on historical experience. The Companies would reevaluate this assumption if market conditions or business developments would reasonably indicate that future volatility might differ materially from historical experience.

A summary of changes in the status of the Performance RSUs’ TSR and non-TSR portions during the year ended December 31, 2023 is as follows:


	Con Edison			CECONY
		Weighted Average Grant Date Fair Value (a)			Weighted Average Grant Date Fair Value (a)
	Units	TSR Portion (b)	Non-TSR Portion (c)	Units	TSR Portion (b)	Non-TSR Portion (c)
Non-vested at December 31, 2022	865,091	$80.02	$80.04	647,826	$79.89	$80.16
Granted	266,200	91.93	90.93	204,466	92.27	91.34
Vested	(264,568)	79.69	89.62	(205,078)	79.40	88.75
Forfeited	(28,420)	86.23	82.22	(8,741)	85.24	81.02

Non-vested at December 31, 2023	838,303	$83.70	$80.40	638,473	$83.94	$80.97

(a)The TSR and non-TSR Portions each account for 50 percent of the awards’ value.

(b)Fair value is determined using the Monte Carlo simulation described above. Weighted average grant date fair value does not reflect any accrual or payment of dividends prior to vesting.

(c)Fair value is determined using the market price of one share of Con Edison common stock on the grant date. The market price has not been discounted to reflect that dividends do not accrue and are not payable on Performance RSUs until vesting.

The total expense to be recognized by Con Edison in future periods for unvested Performance RSUs outstanding at December 31, 2023 is $38 million, including $34 million for CECONY, and is expected to be recognized over a weighted average period of one year for both Con Edison and CECONY. Con Edison and CECONY paid cash of $21 million and $19 million in 2023, $10 million and $9 million in 2022, and $8 million and $7 million in 2021, respectively, to settle vested Performance RSUs.

In accordance with the accounting rules for stock compensation, for time-based awards, the Companies accrue a liability and recognize compensation expense based on the market value of a common share throughout the vesting period. The vesting period for awards is three years and is based on the officer or employee’s continuous service to Con Edison. Prior to vesting, the awards are subject to forfeiture in whole or in part under certain circumstances. The awards are “liability awards” because each restricted stock unit represents the right to receive, upon vesting, one share of Con Edison common stock, the cash value of a share or a combination thereof. As such, prior to vesting, changes in the fair value of the units are reflected in net income.

A summary of changes in the status of time-based awards during the year ended December 31, 2023 is as follows:


	Con Edison		CECONY
	Units	Weighted Average Grant Date Fair Value	Units	Weighted Average Grant Date Fair Value
Non-vested at December 31, 2022	180,588	$84.69	147,415	$85.10
Granted	198,600	92.93	166,539	93.38
Vested	(19,950)	78.00	(18,550)	78.00
Forfeited	(14,037)	87.26	(6,341)	88.47
Non-vested at December 31, 2023	345,201	$89.71	289,063	$90.25

The total expense to be recognized by Con Edison in future periods for unvested time-based awards outstanding at December 31, 2023 is $12 million, including $12 million for CECONY, and is expected to be recognized over a weighted average period of two years. Con Edison and CECONY paid cash of $2 million in 2023 and 2022, and $1 million in 2021, to settle vested time-based awards.

Under the LTIP, each non-employee director receives stock units, which are deferred until the director’s separation from service or another date specified by the director. Each director may also elect to defer all or a portion of their cash compensation into additional stock units, which are deferred until the director’s termination of service or another date specified by the director. Non-employee directors’ stock units issued under the LTIP are considered “equity awards,” because they may only be settled in shares. Directors immediately vest in units issued to them. The fair value of the units is determined using the closing price of Con Edison’s common stock on the business day immediately preceding the date of issue. In the year ended December 31, 2023, approximately 29,000 units were issued at a weighted average grant date price of $94.78.

Stock Purchase Plan

The Stock Purchase Plans, which were approved by shareholders in 2004 and 2014 (collectively, the Plan), provide for the Companies to contribute up to $1 for each $9 invested by their directors, officers or employees to purchase Con Edison common stock under the Plan. Eligible participants may invest up to $25,000 during any calendar year (subject to an additional limitation for officers and employees of not more than 20 percent of their pay). Dividends paid on shares held under the Plan are reinvested in additional shares unless otherwise directed by the participant.

Participants in the Plan immediately vest in shares purchased by them under the Plan. Prior to September 1, 2020, the fair value of the shares of Con Edison common stock purchased under the Plan was calculated using the average of the high and low composite sale prices at which shares were traded at the New York Stock Exchange on the trading day immediately preceding such purchase dates. During 2020, the Plan was amended and as a result of the amendment, the fair value of the shares of Con Edison common stock purchased after September 1, 2020 under the Plan was calculated using the closing price at which shares were traded on the New York Stock Exchange on the last business day of the month for all shares purchased during the month. During 2023, 2022 and 2021, 751,702, 744,932 and 957,866 shares were purchased under the Plan at a weighted average price of $91.80, $91.59 and $73.38 per share, respectively.

Consolidated Statement of Cash Flows - CECONY - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net income for common stock	$ 2,519	$ 1,660	$ 1,346
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	2,031	2,056	2,032
Deferred income taxes	132	435	133
Rate case amortization and accruals	92	73	(16)
Other non-cash items, net	(90)	90	127
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable	(275)	(285)	(411)
Allowance for uncollectible accounts – customers	38	5	169
Materials and supplies, including fuel oil and gas in storage	38	(111)	(82)
Revenue decoupling mechanism receivable	(39)	26	(53)
Other receivables and other current assets	141	(21)	(157)
Unbilled revenue and net unbilled revenue deferrals	(48)	(96)	(53)
Prepayments	(200)	26	(24)
Accounts payable	(285)	558	44
Pensions and retiree benefits obligations, net	(201)	176	266
Pensions and retiree benefits contributions	(33)	(39)	(472)
Superfund and environmental remediation costs	(12)	(22)	(10)
Accrued taxes	(13)	7	(46)
Accrued interest	(7)	42	4
Deferred charges, noncurrent assets, leases, net and other regulatory assets	(1,216)	(870)	(496)
Deferred credits, noncurrent liabilities and other regulatory liabilities	196	445	258
Other current liabilities	213	1	(81)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,156	3,935	2,733
INVESTING ACTIVITIES
Utility construction expenditures	(4,353)	(3,824)	(3,630)
Cost of removal less salvage	(387)	(337)	(323)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,003)	(4,565)	(3,484)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(752)	1,702	(382)
Issuance of long-term debt	2,050	800	2,804
Retirement of long-term debt	(710)	(406)	(1,960)
Debt issuance costs	(32)	(13)	(40)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	(1,488)	1,014	461
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(335)	384	(290)
BALANCE AT BEGINNING OF PERIOD	1,530	1,146	1,436
BALANCE AT END OF PERIOD	1,195	1,530	1,146
Cash paid during the period for:
Interest	987	900	924
Income taxes	397	47	9
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	598	681	457
CECONY
OPERATING ACTIVITIES
Net income for common stock	1,606	1,390	1,344
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,924	1,778	1,705
Deferred income taxes	556	85	124
Rate case amortization and accruals	72	55	(16)
Other non-cash items, net	(40)	148	30
CHANGES IN ASSETS AND LIABILITIES
Allowance for uncollectible accounts – customers	39	10	166
Materials and supplies, including fuel oil and gas in storage	18	(71)	(78)
Revenue decoupling mechanism receivable	(26)	27	(62)
Other receivables and other current assets	(136)	111	(161)
Unbilled revenue and net unbilled revenue deferrals	(47)	(28)	(16)
Prepayments	(106)	(11)	(53)
Accounts payable	(137)	322	65
Accounts payable to affiliated companies	(1)	(1)	(4)
Pensions and retiree benefits obligations, net	(204)	182	283
Pensions and retiree benefits contributions	(33)	(26)	(433)
Superfund and environmental remediation costs	(12)	(20)	(18)
Accrued interest	25	7	1
Deferred charges, noncurrent assets, leases, net and other regulatory assets	(1,158)	(852)	(484)
Deferred credits, noncurrent liabilities and other regulatory liabilities	199	332	210
Other current liabilities	239	7	(56)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,285	3,263	2,186
INVESTING ACTIVITIES
Utility construction expenditures	(4,059)	(3,596)	(3,413)
Cost of removal less salvage	(380)	(330)	(316)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(4,439)	(3,926)	(3,729)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	(397)	939	(299)
Issuance of long-term debt	2,000	700	2,250
Retirement of long-term debt	0	0	(640)
Debt issuance costs	(31)	(12)	(27)
Capital contribution by Con Edison	1,720	150	1,100
Dividend to Con Edison	(1,056)	(978)	(988)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	2,236	799	1,396
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	82	136	(147)
BALANCE AT BEGINNING OF PERIOD	1,056	920	1,067
BALANCE AT END OF PERIOD	1,138	1,056	920
Cash paid during the period for:
Interest	882	755	739
Income taxes	(27)	87	5
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	564	561	406
CECONY \| Nonrelated Party
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable	(270)	(268)	(412)
Accrued taxes	(35)	15	(54)
CECONY \| Related Party
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable	(100)	(8)	96
Accrued taxes	(88)	79	9
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	0	2	23
Software Licenses \| CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	0	2	22
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	11	17	22
Equipment \| CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 11	$ 17	$ 22

Consolidated Statement of Shareholder’s Equity - CECONY - USD ($) $ in Millions	Total	CECONY	Common Stock	Common Stock CECONY	Additional Paid-In Capital CECONY	Retained Earnings	Retained Earnings CECONY	Repurchased Con Edison Stock CECONY	Capital Stock Expense CECONY	Accumulated Other Comprehensive Income/(Loss)	Accumulated Other Comprehensive Income/(Loss) CECONY
BALANCE AS OF BEGINNING OF PERIOD (in shares) at Dec. 31, 2020			342,000,000	235,000,000
BALANCE AS OF BEGINNING OF PERIOD at Dec. 31, 2020		$ 14,849		$ 589	$ 6,169		$ 9,122	$ (962)	$ (62)		$ (7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	$ 1,346	1,344					1,344
Common stock dividend to Con Edison	(1,079)	(988)				$ (1,079)	(988)
Capital contribution by Con Edison		1,100			1,100
Other comprehensive income (loss)	30	7								$ 30	7
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2021			354,000,000	235,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2021		16,312		$ 589	7,269		9,478	(962)	(62)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	1,660	1,390					1,390
Common stock dividend to Con Edison	(1,120)	(978)				(1,120)	(978)
Capital contribution by Con Edison		150			150
Other comprehensive income (loss)	$ 17	$ 4								$ 17	4
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2022	354,962,058	235,488,094	355,000,000	235,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2022	$ 20,687	$ 16,878		$ 589	7,419		9,890	(962)	(62)		4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	2,519	1,606					1,606
Common stock dividend to Con Edison	$ (1,127)	(1,056)				$ (1,127)	(1,056)
Capital contribution by Con Edison		1,720			1,720
Other comprehensive income (loss)		$ (2)									(2)
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2023	345,415,772	235,488,094	345,000,000	235,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2023	$ 21,158	$ 19,146		$ 589	$ 9,139		$ 10,440	$ (962)	$ (62)		$ 2

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-1A

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

+ Details

Financial Information by Business Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Cost of services provided	$ 14,663	$ 15,670	$ 13,676
Depreciation and amortization	2,031	2,056	2,032
Operating income	3,196	2,624	2,826
Other Income (deductions)	830	326	(538)
Interest charges	1,023	852	905
Income Tax Expense	487	498	190
Total assets	66,331	69,065	63,116
Capital expenditures	4,509	4,465	3,964
CECONY
Segment Reporting Information [Line Items]
Cost of services provided	13,476	13,268	11,716
Depreciation and amortization	1,924	1,778	1,705
Operating income	2,177	2,135	2,460
Other Income (deductions)	732	332	(108)
Total assets	61,600	57,445
Operating segment \| Clean Energy Businesses
Segment Reporting Information [Line Items]
Cost of services provided	129	1,319	1,022
Depreciation and amortization	0	178	231
Operating income	37	368	236
Other Income (deductions)	1	3	(10)
Interest charges	16	(35)	68
Income Tax Expense	3	84	44
Total assets	0	7,224	6,554
Capital expenditures	81	399	298
Operating segment \| Con Edison Transmission
Segment Reporting Information [Line Items]
Cost of services provided	4	4	4
Depreciation and amortization	1	1	1
Operating income	(9)	(10)	(16)
Other Income (deductions)	62	19	(407)
Interest charges	2	5	9
Income Tax Expense	14	5	(114)
Total assets	414	314	249
Capital expenditures	49	65	31
Operating segment \| CECONY
Segment Reporting Information [Line Items]
Cost of services provided	13,476	13,268	11,716
Depreciation and amortization	1,924	1,778	1,705
Operating income	2,177	2,135	2,460
Other Income (deductions)	732	332	(108)
Interest charges	945	822	762
Income Tax Expense	358	255	246
Total assets	61,600	57,445	52,655
Capital expenditures	4,083	3,758	3,418
Operating segment \| CECONY \| Electric
Segment Reporting Information [Line Items]
Cost of services provided	10,078	9,751	8,806
Depreciation and amortization	1,395	1,315	1,286
Operating income	1,568	1,496	1,802
Other Income (deductions)	564	259	(84)
Interest charges	674	582	542
Income Tax Expense	217	134	146
Total assets	42,226	39,153	36,260
Capital expenditures	2,909	2,522	2,189
Operating segment \| CECONY \| Gas
Segment Reporting Information [Line Items]
Cost of services provided	2,829	2,924	2,378
Depreciation and amortization	429	367	326
Operating income	682	660	646
Other Income (deductions)	122	52	(16)
Interest charges	227	198	179
Income Tax Expense	159	140	109
Total assets	16,343	15,361	13,748
Capital expenditures	1,046	1,128	1,126
Operating segment \| CECONY \| Steam
Segment Reporting Information [Line Items]
Cost of services provided	569	593	532
Depreciation and amortization	100	96	93
Operating income	(73)	(21)	12
Other Income (deductions)	46	21	(8)
Interest charges	44	42	41
Income Tax Expense	(18)	(19)	(9)
Total assets	3,031	2,931	2,647
Capital expenditures	128	108	103
Operating segment \| O&R
Segment Reporting Information [Line Items]
Cost of services provided	1,056	1,085	941
Depreciation and amortization	106	98	95
Operating income	126	136	150
Other Income (deductions)	49	23	(12)
Interest charges	51	46	42
Income Tax Expense	28	25	21
Total assets	3,675	3,511	3,292
Capital expenditures	296	243	217
Operating segment \| O&R \| Electric
Segment Reporting Information [Line Items]
Cost of services provided	759	773	681
Depreciation and amortization	76	71	69
Operating income	85	94	100
Other Income (deductions)	37	17	(8)
Interest charges	32	29	27
Income Tax Expense	20	17	14
Total assets	2,329	2,247	2,123
Capital expenditures	211	167	147
Operating segment \| O&R \| Gas
Segment Reporting Information [Line Items]
Cost of services provided	297	312	260
Depreciation and amortization	30	27	26
Operating income	41	42	50
Other Income (deductions)	12	6	(4)
Interest charges	19	17	15
Income Tax Expense	8	8	7
Total assets	1,346	1,264	1,169
Capital expenditures	85	76	70
Other
Segment Reporting Information [Line Items]
Cost of services provided	(2)	(6)	(7)
Depreciation and amortization	0	1	0
Operating income	865	(5)	(4)
Other Income (deductions)	(14)	(51)	(1)
Interest charges	9	14	24
Income Tax Expense	84	129	(7)
Total assets	642	571	366
Capital expenditures	0	0	0
Inter- segment revenues \| CECONY
Segment Reporting Information [Line Items]
Cost of services provided	(100)	(103)	(100)
Inter- segment revenues \| CECONY \| Electric
Segment Reporting Information [Line Items]
Cost of services provided	18	19	18
Inter- segment revenues \| CECONY \| Gas
Segment Reporting Information [Line Items]
Cost of services provided	8	8	8
Inter- segment revenues \| CECONY \| Steam
Segment Reporting Information [Line Items]
Cost of services provided	$ 74	$ 76	$ 74

Leases

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Leases

The Companies lease land, office buildings, equipment and access rights to support electric transmission facilities. The Companies recognize lease right-of-use assets and lease liabilities on their consolidated balance sheets for virtually all of their leases (other than leases that meet the definition of a short-term lease, the expense for which was immaterial). A lease right-of-use asset represents a right to use an identifiable underlying asset and obtain substantially all of the economic benefits from the use of that asset for the lease term. A lease liability represents an obligation to make lease payments arising from the lease. Leases are classified as either operating leases or finance leases. Operating leases of the Utilities are included in operating lease right-of-use asset and operating lease liabilities on the Companies’ consolidated balance sheets. Operating leases of the Clean Energy businesses are included in assets held for sale and liabilities held for sale on Con Edison's consolidated balance sheet as of December 31, 2022. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X. Finance leases are included in other noncurrent assets, other current liabilities and other noncurrent liabilities. The Utilities, as regulated entities, are permitted to continue to recognize expense for operating leases using the timing that conforms to the regulatory rate treatment as rental payments are recovered from our customers and to account the same way for finance leases.

For new operating leases, the Companies recognize operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Companies’ leases do not provide an implicit rate, the Companies used their collateralized incremental borrowing rate based on the information available at the commencement date to determine the present value of future payments. Most of the Companies’ leases have remaining lease terms of one year to 20 years and may include options to renew or extend the leases for up to five years at the fair rental value. The Companies' lease terms include options to renew, extend or terminate the lease when it is reasonably certain that the Companies will exercise that option. There were no leases with material variable lease payments or residual value guarantees. The Companies account for lease and non-lease components as a single lease component.

Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the years ended December 31, 2023, 2022, and 2021 were as follows:


	Con Edison (a)			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Operating lease cost	$70	$88	$86	$66	$67	$66
Operating lease cash flows	$68	$83	$80	$65	$64	$63

(a)Amounts for Con Edison include amounts for the Clean Energy Businesses through February 2023. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

As of December 31, 2023, 2022, and 2021, assets recorded as finance leases for Con Edison were $2 million for each year and the accumulated amortization associated with such finance leases were $2 million, $5 million, and $4 million, respectively. As of December 31, 2023, 2022, and 2021, assets recorded as finance leases for CECONY were $1 million for each year and the accumulated amortization associated with such finance leases were $2 million for each year.

For the years ended December 31, 2023, 2022, and 2021, finance lease costs and cash flows for Con Edison and CECONY were immaterial.

Right-of-use assets obtained in exchange for lease obligations for Con Edison and CECONY were $11 million for the year ended December 31, 2023 and $79 million and $68 million, respectively, for the year ended December 31, 2022 of which $10 million for Con Edison related to the Clean Energy Businesses. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

Other information related to leases for Con Edison and CECONY at December 31, 2023 and 2022 was as follows:


	Con Edison		CECONY
	2023	2022	2023	2022
Weighted Average Remaining Lease Term:
Operating leases, (a) (b)	11.4 years	12.3 years	11.4 years	12.4 years
Finance leases	6.6 years	7.2 years	2.7 years	2.3 years
Weighted Average Discount Rate:
Operating leases, (a) (b)	3.7%	3.7%	3.7%	3.7%
Finance leases	3.0%	1.9%	3.1%	1.0%

(a)Amounts for Con Edison in 2022 exclude operating leases of the Clean Energy Businesses, inclusive of Broken Bow II, that were classified as held for sale as of December 31, 2022. Including the operating leases of the Clean Energy Businesses would result in a weighted average remaining lease term of 18.3 years and a weighted average discount rate of 4.4 percent as of December 31, 2022. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. See Note W and Note X.

(b)Amounts for Con Edison in 2023 exclude the operating lease of Broken Bow II, that was classified as held for sale as of December 31, 2023. Including the operating lease of Broken Bow II would result in a weighted average remaining lease term of 11.6 years and a weighted average discount rate of 3.8 percent as of December 31, 2023. See Note W and Note X.

Future minimum lease payments under non-cancellable leases at December 31, 2023 were as follows:


(Millions of Dollars)	Con Edison		CECONY
Year Ending December 31, (b)	Operating Leases	Finance Leases	Operating Leases	Finance Leases
2024	$67	$1	$66	$1
2025	66	—	66	—
2026	66	—	66	—
2027	65	—	65	—
2028	60	—	60	—
All years thereafter	365	1	365	—
Total future minimum lease payments	$689	$2	$688	$1
Less: imputed interest	(144)	—	(143)	—
Total	$545	$2	$545	$1
Reported as of December 31, 2023
Operating lease liabilities (current) (a)	$116	$—	$116	$—
Operating lease liabilities held for sale (current)	2	—	—	—
Operating lease liabilities (noncurrent) (a)	429	—	429	—
Operating lease liabilities held for sale (noncurrent)	5	—	—	—
Other current liabilities	—	1	—	1
Other noncurrent liabilities	—	1	—	—
Total	$552	$2	$545	$1

(a)Amounts exclude operating lease liabilities of Broken Bow II ($7 million) that are classified as current and noncurrent liabilities held for sale on Con Edison's consolidated balance sheet as of December 31, 2023. See Note X.

(b)Amounts exclude operating lease future minimum lease payments of Broken Bow II, of $3 million in total for years ended December 31, 2024 through 2028, and $10 million for all years thereafter, and imputed interest of $6 million.

The Companies are lessors under certain leases whereby the Companies own real estate and distribution poles and lease portions of them to others. Revenue under such leases was immaterial for Con Edison and CECONY for the years ended December 31, 2023 and 2022.

Leases

Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the years ended December 31, 2023, 2022, and 2021 were as follows:


	Con Edison (a)			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Operating lease cost	$70	$88	$86	$66	$67	$66
Operating lease cash flows	$68	$83	$80	$65	$64	$63

For the years ended December 31, 2023, 2022, and 2021, finance lease costs and cash flows for Con Edison and CECONY were immaterial.

Other information related to leases for Con Edison and CECONY at December 31, 2023 and 2022 was as follows:


	Con Edison		CECONY
	2023	2022	2023	2022
Weighted Average Remaining Lease Term:
Operating leases, (a) (b)	11.4 years	12.3 years	11.4 years	12.4 years
Finance leases	6.6 years	7.2 years	2.7 years	2.3 years
Weighted Average Discount Rate:
Operating leases, (a) (b)	3.7%	3.7%	3.7%	3.7%
Finance leases	3.0%	1.9%	3.1%	1.0%

Future minimum lease payments under non-cancellable leases at December 31, 2023 were as follows:


(Millions of Dollars)	Con Edison		CECONY
Year Ending December 31, (b)	Operating Leases	Finance Leases	Operating Leases	Finance Leases
2024	$67	$1	$66	$1
2025	66	—	66	—
2026	66	—	66	—
2027	65	—	65	—
2028	60	—	60	—
All years thereafter	365	1	365	—
Total future minimum lease payments	$689	$2	$688	$1
Less: imputed interest	(144)	—	(143)	—
Total	$545	$2	$545	$1
Reported as of December 31, 2023
Operating lease liabilities (current) (a)	$116	$—	$116	$—
Operating lease liabilities held for sale (current)	2	—	—	—
Operating lease liabilities (noncurrent) (a)	429	—	429	—
Operating lease liabilities held for sale (noncurrent)	5	—	—	—
Other current liabilities	—	1	—	1
Other noncurrent liabilities	—	1	—	—
Total	$552	$2	$545	$1

Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Net income for common stock	$ 2,519	$ 1,660	$ 1,346
Weighted average common shares outstanding – basic (in shares)	347.7	354.5	348.4
Add: Incremental shares attributable to effect of potentially dilutive securities (in shares)	1.6	1.3	1.0
Adjusted weighted average common shares outstanding – diluted (in shares)	349.3	355.8	349.4
Net income per common share — basic (in dollars per share)	$ 7.25	$ 4.68	$ 3.86
Net income per common share — diluted (in dollars per share)	$ 7.21	$ 4.66	$ 3.85

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Pension Benefits

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Pension Benefits

Con Edison maintains a tax-qualified, non-contributory pension plan, the Consolidated Edison Retirement Plan, that covers substantially all employees of CECONY, O&R and Con Edison Transmission. The plan is designed to comply with the Internal Revenue Code and the Employee Retirement Income Security Act of 1974. Con Edison also maintains additional non–qualified supplemental pension plans.

Total Periodic Benefit Cost/(Credit)

The components of the Companies’ total periodic benefit cost/(credit) for 2023, 2022 and 2021 were as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Service cost – including administrative expenses	$161	$287	$343	$151	$270	$321
Interest cost on projected benefit obligation	649	505	471	611	475	443
Expected return on plan assets	(1,114)	(1,168)	(1,096)	(1,061)	(1,109)	(1,040)
Recognition of net actuarial loss/(gain)	(232)	377	787	(219)	358	746
Recognition of prior service credit	(17)	(16)	(17)	(19)	(21)	(19)
TOTAL PERIODIC BENEFIT COST/(CREDIT)	$(553)	$(15)	$488	$(537)	$(27)	$451
Cost capitalized	(81)	(137)	(154)	(78)	(129)	(146)
Reconciliation to rate level	282	259	(226)	261	245	(216)
Total expense/(benefit) recognized	$(352)	$107	$108	$(354)	$89	$89

Accounting rules require that components of net periodic benefit cost other than service cost be presented outside of operating income on consolidated income statements, and that only the service cost component is eligible for capitalization. Accordingly, the service cost components are included in the line "Other operations and maintenance" and the non-service cost components are included in the lines "Other income" or “Other deductions” in the Companies' consolidated income statements. The rules also require disclosure of the weighted-average interest

crediting rate used for cash balance plans for all periods presented, and a narrative description of significant changes in the benefit obligation which are included below and, as applicable, in Note F.

Funded Status

The funded status at December 31, 2023, 2022 and 2021 was as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
CHANGE IN PROJECTED BENEFIT OBLIGATION
Projected benefit obligation at beginning of year	$12,113	$17,357	$18,965	$11,395	$16,341	$17,821
Service cost – excluding administrative expenses	156	283	337	146	266	317
Interest cost on projected benefit obligation	649	505	471	611	475	443
Net actuarial loss/(gain)	599	(5,102)	(1,547)	572	(4,845)	(1,441)
Plan amendments	3	—	—	—	—	—
Benefits paid	(808)	(930)	(869)	(747)	(842)	(799)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR	$12,712	$12,113	$17,357	$11,977	$11,395	$16,341
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	$14,979	$18,504	$17,022	$14,248	$17,566	$16,147
Actual return on plan assets	1,261	(2,583)	1,935	1,201	(2,453)	1,838
Employer contributions	21	30	469	18	17	432
Benefits paid	(808)	(930)	(869)	(747)	(842)	(799)
Administrative expenses	(49)	(42)	(53)	(46)	(40)	(52)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	$15,404	$14,979	$18,504	$14,674	$14,248	$17,566
FUNDED STATUS	$2,692	$2,866	$1,147	$2,697	$2,853	$1,225
Unrecognized net loss/(gain)	$(757)	($1,485)	$205	$(705)	($1,397)	$207
Unrecognized prior service credits	(105)	(124)	(140)	(124)	(143)	(163)
Accumulated benefit obligation	$11,739	$11,167	$15,469	$11,031	$10,478	$14,504

The decrease in the pension funded status at December 31, 2023 for Con Edison and CECONY of $174 million and $156 million, respectively, compared with December 31, 2022, was primarily due to an increase in the plan's projected benefit obligation as a result of a decrease in the discount rate, partially offset by a return on plan assets that was greater than the expected return. The increase in the pension funded status at December 31, 2022 for Con Edison and CECONY of $1,719 million and $1,628 million, respectively, compared with December 31, 2021, was primarily due to a decrease in the plan's projected benefit obligation as a result of an increase in the discount rate. See below for further information on the change in the discount rate and determination of the discount rate assumption. For Con Edison, the 2023 decrease in pension funded status asset corresponds with a decrease to regulatory liabilities of $741 million for unrecognized net gains and unrecognized prior service credits associated with the Utilities consistent with the accounting rules for regulated operations, a debit to OCI of $1 million (net of taxes) for the unrecognized net gains, and an immaterial change to OCI (net of taxes) for the unrecognized prior service credits associated with certain employees of Con Edison Transmission and RECO who previously worked for the Utilities. For 2023, included within the funded status are noncurrent liabilities of $337 million and $313 million for Con Edison and CECONY, respectively. For 2022, included within the funded status are noncurrent liabilities of $311 million and $287 million for Con Edison and CECONY, respectively.

For CECONY, the decrease in pension funded status asset at December 31, 2023 corresponds with a decrease to regulatory liabilities of $710 million for unrecognized net gains and unrecognized prior service credits consistent with the accounting rules for regulated operations, and also a debit to OCI of $2 million (net of taxes) for unrecognized net gains, and an immaterial change to OCI (net of taxes) for the unrecognized prior service costs associated with certain employees of Con Edison Transmission who previously worked for CECONY.

At December 31, 2023 and 2022, Con Edison’s investments included $524 million and $459 million, respectively, held in external trust accounts for benefit payments pursuant to the supplemental retirement plans. Included in these amounts for CECONY were $502 million and $439 million, respectively. See Note R. The accumulated benefit obligations for the supplemental retirement plans for Con Edison and CECONY were $349 million and $323 million as of December 31, 2023, respectively, and $306 million and $280 million as of December 31, 2022, respectively.

Assumptions

The actuarial assumptions were as follows:


	2023		2022		2021
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	5.15	%	5.45	%	3.00	%
Interest crediting rate for cash balance plan	4.20	%	4.00	%	3.50	%
Rate of compensation increase
CECONY	3.80	%	3.80	%	3.80	%
O&R	3.20	%	3.20	%	3.20	%
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate	5.45	%	3.00	%	2.55	%
Interest crediting rate for cash balance plan	4.00	%	3.50	%	3.00	%
Expected return on plan assets	6.75	%	7.00	%	7.00	%
Rate of compensation increase
CECONY	3.80	%	3.80	%	3.80	%
O&R	3.20	%	3.20	%	3.20	%

The expected return assumption reflects anticipated returns on the plan’s current and future assets. The Companies’ expected return was based on an evaluation of the current environment, market and economic outlook, relationships between the economy and asset class performance patterns, and recent and long-term trends in asset class performance. The projections were based on the plan’s target asset allocation.

Discount Rate Assumption

To determine the assumed discount rate, the Companies use a model that produces a yield curve based on discounting plan specific cash flows with corresponding spot rates on a yield curve. Term structures of interest rates are based on AA rated corporate bonds. Bonds with questionable pricing information and bonds that are not representative of the overall market are excluded from consideration. For example, the bonds used in the model cannot be callable (with the exception of "make whole" callable bonds). The spot rates defined by the yield curve and the plan’s projected benefit payments are used to develop a weighted average discount rate.

Expected Benefit Payments

Based on current assumptions, the Companies expect to make the following benefit payments over the next ten years:


(Millions of Dollars)	2024	2025	2026	2027	2028	2029-2033
Con Edison	$768	$817	$789	$804	$811	$4,158
CECONY	711	762	734	750	756	3,891

Expected Contributions

Based on estimates as of December 31, 2023, the Companies expect to make contributions to the pension plans during 2024 of $11 million (of which $9 million is to be made by CECONY). The Companies’ policy is to fund the total periodic benefit cost, if any, of the qualified plan to the extent tax deductible and to also contribute to the non-qualified supplemental plans.

Plan Assets

The asset allocations for the pension plan at the end of 2023, 2022 and 2021, and the target allocation for 2024 are as follows:


	Target Allocation Range	Plan Assets at December 31,
Asset Category	2024	2023		2022		2021
Equity Securities	26% - 30%	26	%	33	%	50	%
Debt Securities	42% - 60%	50	%	50	%	38	%
Real Estate and Other Alternatives	14% - 30%	24	%	17	%	12	%
Total		100	%	100	%	100	%

Con Edison has established a pension trust for the investment of assets to be used for the exclusive purpose of providing retirement benefits to participants and beneficiaries and payment of plan expenses.

Pursuant to resolutions adopted by Con Edison’s Board of Directors, the Named Fiduciary Committee (the Committee) has general oversight responsibility for Con Edison’s pension and other employee benefit plans. The pension plan’s named fiduciaries have been granted the authority to control and manage the operation and administration of the plans, including overall responsibility for the investment of assets in the trust and the power to appoint and terminate investment managers.

The investment objectives of the Con Edison pension plan are to maintain a level and form of assets adequate to meet benefit obligations to participants, to achieve the expected long-term total return on the trust assets within a prudent level of risk and maintain a level of volatility that is not expected to have a material impact on the company’s expected contribution and expense or the company’s ability to meet plan obligations. The assets of the plan have no significant concentration of risk in one country (other than the United States), industry or entity.

The strategic asset allocation is intended to meet the objectives of the pension plan by diversifying its funds across asset classes, investment styles and fund managers. An asset/liability study typically is conducted every few years to determine whether the current strategic asset allocation continues to represent the appropriate balance of expected risk and reward for the plan to meet expected liabilities. Each study considers the investment risk of the asset allocation and determines the optimal asset allocation for the plan. The target asset allocation for 2024 reflects the results of such a study conducted in 2022.

Individual fund managers operate under written guidelines provided by Con Edison that cover such areas as investment objectives, performance measurement, permissible investments, investment restrictions, trading and execution, and communication and reporting requirements. Con Edison management regularly monitors and the named fiduciaries review asset class performance, total fund performance, and compliance with asset allocation guidelines. Management changes fund managers and rebalances the portfolio as appropriate.

Assets measured at fair value on a recurring basis are summarized below as defined by the accounting rules for fair value measurements (see Note R).

The fair values of the pension plan assets at December 31, 2023 by asset category are as follows:


(Millions of Dollars)	Level 1	Level 2	Total
Investments within the fair value hierarchy
U.S. Equity (a)	$2,474	$1	$2,475
International Equity (b)	1,584	—	1,584
U.S. Government Issued Debt (c)	—	615	615
Corporate Bonds Debt (d)	—	5,526	5,526
Structured Assets Debt (e)	—	132	132
Other Fixed Income Debt (f)	—	1,210	1,210
Cash and Cash Equivalents (g)	36	302	338
Futures (h)	19	—	19
Total investments within the fair value hierarchy	$4,113	$7,786	$11,899
Investments measured at NAV per share (n)
Private Equity (i)			1,031
Real Estate (j)			1,876
Hedge Funds (k)			723
Total investments valued using NAV per share			$3,630
Funds for retiree health benefits (l)	(52)	(96)	(148)
Funds for retiree health benefits measured at NAV per share (l)(n)			(45)
Total funds for retiree health benefits			$(193)
Investments (excluding funds for retiree health benefits)	$4,061	$7,690	$15,336
Pending activities (m)			68
Total fair value of plan net assets			$15,404

(a)U.S. Equity is comprised of both actively- and passively-managed investments in domestic equity index funds and actively-managed small-capitalization equities.

(b)International Equity is comprised of investments in international equity index funds and actively-managed international equities.

(c)U.S. Government Issued Debt is comprised of agency and treasury securities.

(d)Corporate Bonds Debt is comprised of debt issued by various corporations.

(e)Structured Assets Debt is comprised of commercial-mortgage-backed securities and collateralized mortgage obligations.

(f)Other Fixed Income Debt is comprised of municipal bonds, sovereign debt and regional governments.

(g)Cash and Cash Equivalents are comprised of short term investments, money markets, foreign currency and cash collateral.

(h)Futures are comprised of exchange-traded financial contracts encompassing U.S. Equity, International Equity and U.S. Government indices.

(i)Private Equity is comprised of global private market investments. Private equity's investment objective is to generate returns on capital from a diversified portfolio of primary fund investments, secondaries and co-investments. The plan's unfunded commitments to private equity were approximately $193 million at December 31, 2023. However, the managers also expect to make significant cash flow distributions in 2024 and 2025. While the investments in this asset class cannot be redeemed, the plan would be able to receive distributions from selling its limited partnership interests in the secondary market, which would be expected to take three to six months.

(j)Real Estate investments are open-end real estate funds that invest in a portfolio of real properties that are broadly diversified by geography and property type. The real estate asset class is expected to produce returns from income and capital appreciation. Real estate also provides a hedge against inflation. The funds allow for quarterly redemptions, however the amount and timing of distributions are subject to market conditions and are currently uncertain.

(k)Hedge Funds are structured as a custom fund of one and can invest in external hedge fund managers that pursue a wide array of strategies including event driven, fundamental long/short, relative value, directional trading, and direct sourcing. These investments seek to generate positive absolute returns with lower volatility than other investments. The various hedge fund managers can invest in all financial instruments. Substantially all of the investment could be liquidated within 18 months.

(l)The Companies set aside funds for retiree health benefits through a separate account within the pension trust, as permitted under Section 401(h) of the Internal Revenue Code of 1986, as amended. In accordance with the Code, the plan’s investments in the 401(h) account may not be used for, or diverted to, any purpose other than providing health benefits for retirees. The net assets held in the 401(h) account are calculated based on a pro-rata percentage allocation of the net assets in the pension plan. The related obligations for health benefits are not included in the pension plan’s obligations and are included in the Companies’ other postretirement benefit obligation. See Note F.

(m)Pending activities include security purchases and sales that have not settled, interest and dividends that have not been received and reflects adjustments for available estimates at year end.

(n)In accordance with ASU 2015-07, Fair Value Measurements (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or its equivalent), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.

The fair values of the pension plan assets at December 31, 2022 by asset category are as follows:


(Millions of Dollars)	Level 1	Level 2	Total
Investments within the fair value hierarchy
U.S. Equity (a)	$2,150	$3	$2,153
International Equity (b)	1,534	—	1,534
U.S. Government Issued Debt (c)	—	823	823
Corporate Bonds Debt (d)	—	4,961	4,961
Structured Assets Debt (e)	—	183	183
Other Fixed Income Debt (f)	—	1,088	1,088
Cash and Cash Equivalents (g)	71	274	345
Futures (h)	(1)	—	(1)
Total investments within the fair value hierarchy	$3,754	$7,332	$11,086
Investments measured at NAV per share (n)
Private Equity (i)			1,018
Real Estate (j)			2,366
Hedge Funds (k)			657
Total investments valued using NAV per share			$4,041
Funds for retiree health benefits (l)	(48)	(91)	(139)
Funds for retiree health benefits measured at NAV per share (l)(n)			(51)
Total funds for retiree health benefits			$(190)
Investments (excluding funds for retiree health benefits)	$3,706	$7,241	$14,937
Pending activities (m)			$42
Total fair value of plan net assets			$14,979

(a) - (n) Reference is made to footnotes (a) through (n) in the above table of pension plan assets at December 31, 2023 by asset category.

The Companies also offer a defined contribution savings plan that covers substantially all employees and made contributions to the plan as follows:


	For the Years Ended December 31,
(Millions of Dollars)	2023	2022	2021
Con Edison	$57	$57	$55
CECONY	51	48	46

- Definition

The entire disclosure for retirement benefits.

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-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480266/715-60-50-3

+ Details

Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill		$ 408	$ 408
Goodwill impaired	$ 7
CECONY
Goodwill [Line Items]
Goodwill		245	245
O&R
Goodwill [Line Items]
Goodwill		161	161
CECONY
Goodwill [Line Items]
Goodwill impaired	2
CET Gas
Goodwill [Line Items]
Goodwill impaired	$ 5
O&R Merger
Goodwill [Line Items]
Goodwill		$ 406	$ 406

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

+ Details

Material Contingencies - Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Guarantee obligations maximum exposure	$ 175	$ 2,412

Regulatory Matters - Summary of Utilities Rate Plans (O&R New York-Electric) (Details) - USD ($)	1 Months Ended	12 Months Ended					36 Months Ended
	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2024	Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]
Deferred regulatory assets		$ 722,000,000	$ 702,000,000
Deferred regulatory liabilities		0	3,000,000	$ 7,000,000	$ 41,000,000			$ 7,000,000
O&R \| Electric
Public Utilities, General Disclosures [Line Items]
Deferred regulatory assets					6,000,000	$ 100,000
Deferred regulatory liabilities		3,400,000	6,900,000	10,000,000				10,000,000
Negative revenue adjustments				0	0	0
Deferral of net increase (decrease) to regulatory assets		15,400,000	9,400,000	24,000,000	30,300,000	4,300,000
Deferred regulatory asset (liability)		$ 0	0	$ 0	(400,000)	$ 0		$ 0
Earnings sharing (percent)						9.60%
Common equity ratio (percent)								48.00%
Deferrals for property taxes limitation from rates (percent)								90.00%
Recovery of late payment charges, period (in years)		3 years
Recovery of late payment charges, amount		$ 2,200,000
Recovery of late payment charges, return on equity threshold rate		500.00%
O&R \| Electric \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Authorized return on common equity (percent)	10.25%
Common equity ratio (percent)	50.00%
Requested rate increase (decrease), amount	$ 18,100,000
O&R \| Electric \| Rate Plan for Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes								$ 13,400,000
Amortization to income of net regulatory assets								1,500,000
Potential earnings adjustment mechanism incentives								3,600,000
Potential incentive if target is met, related to service terminations								500,000
Weighted average cost of capital (after-tax)								$ 878,000,000
Weighted average cost of capital (after-tax) (percent)								6.97%
Authorized return on common equity (percent)								9.00%
Actual return on common equity (percent)								9.60%
Cost of long-term debt (percent)								5.17%
Requested rate increase (decrease), amount								$ 8,600,000
Regulatory assets, amortization period (in years)				6 years				6 years
Deferral, annual maximum (not more than) (percent)								0.10%
O&R \| Electric \| Rate Plan for Year 1 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Average rate base								$ 1,008,000,000
O&R \| Electric \| Rate Plan for Year 1 \| Advanced metering infrastructure (AMI)
Public Utilities, General Disclosures [Line Items]
Average rate base								48,000,000
O&R \| Electric \| Rate Plan for Year 1 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential penalties (annually)								4,400,000
O&R \| Electric \| Rate Plan for Year 2
Public Utilities, General Disclosures [Line Items]
Base rate changes								8,000,000
Amortization to income of net regulatory assets								1,500,000
Potential earnings adjustment mechanism incentives								4,000,000
Potential incentive if target is met, related to service terminations								500,000
Weighted average cost of capital (after-tax)								$ 906,000,000
Weighted average cost of capital (after-tax) (percent)								6.96%
Actual return on common equity (percent)								8.76%
Cost of long-term debt (percent)								5.14%
Requested rate increase (decrease), amount								$ 12,100,000
Deferral, annual maximum (not more than) (percent)								0.075%
O&R \| Electric \| Rate Plan for Year 2 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Average rate base								$ 1,032,000,000
O&R \| Electric \| Rate Plan for Year 2 \| Advanced metering infrastructure (AMI)
Public Utilities, General Disclosures [Line Items]
Average rate base								58,000,000
O&R \| Electric \| Rate Plan for Year 2 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential penalties (annually)								4,400,000
O&R \| Electric \| Rate Plan for Year 3
Public Utilities, General Disclosures [Line Items]
Base rate changes								5,800,000
Amortization to income of net regulatory assets								1,500,000
Potential earnings adjustment mechanism incentives								4,200,000
Potential incentive if target is met, related to service terminations		$ 1,500,000	$ 2,700,000					500,000
Weighted average cost of capital (after-tax)								$ 948,000,000
Weighted average cost of capital (after-tax) (percent)								6.96%
Actual return on common equity (percent)								9.16%
Cost of long-term debt (percent)								5.14%
Requested rate increase (decrease), amount								$ 12,200,000
Deferral, annual maximum (not more than) (percent)								0.05%
O&R \| Electric \| Rate Plan for Year 3 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Average rate base								$ 1,083,000,000
O&R \| Electric \| Rate Plan for Year 3 \| Advanced metering infrastructure (AMI)
Public Utilities, General Disclosures [Line Items]
Average rate base								61,000,000
O&R \| Electric \| Rate Plan for Year 3 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential penalties (annually)								$ 4,500,000
O&R \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Earnings sharing (percent)							9.70%
Common equity ratio (percent)							48.00%
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes							$ 4,900,000
Amortization to income of net regulatory assets							11,800,000
Potential earnings adjustment mechanism incentives							3,300,000
Weighted average cost of capital (after-tax)							$ 1,021,000,000
Weighted average cost of capital (after-tax) (percent)							6.77%
Authorized return on common equity (percent)							9.20%
Actual return on common equity (percent)							0.0009%
Cost of long-term debt (percent)							4.58%
Requested rate increase (decrease), amount							$ 11,700,000
Regulatory assets, amortization period (in years)							5 years
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 1 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Average rate base							$ 1,175,000,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 1 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential penalties (annually)							4,300,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 2
Public Utilities, General Disclosures [Line Items]
Base rate changes							16,200,000
Amortization to income of net regulatory assets							13,500,000
Potential earnings adjustment mechanism incentives							2,300,000
Weighted average cost of capital (after-tax)							$ 1,044,000,000
Weighted average cost of capital (after-tax) (percent)							6.73%
Actual return on common equity (percent)							0.00087%
Cost of long-term debt (percent)							4.51%
Requested rate increase (decrease), amount							$ 11,700,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 2 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Average rate base							1,198,000,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 2 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential penalties (annually)							4,400,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 3
Public Utilities, General Disclosures [Line Items]
Base rate changes							23,100,000
Amortization to income of net regulatory assets							15,200,000
Potential earnings adjustment mechanism incentives							4,000,000
Weighted average cost of capital (after-tax)							$ 1,144,000,000
Weighted average cost of capital (after-tax) (percent)							6.72%
Cost of long-term debt (percent)							4.49%
Requested rate increase (decrease), amount							$ 11,700,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 3 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Average rate base							1,304,000,000
O&R \| Electric \| Scenario, Forecast \| Rate Plan for Year 3 \| Maximum
Public Utilities, General Disclosures [Line Items]
Potential penalties (annually)							$ 5,100,000
Energy Efficiency \| O&R \| Electric
Public Utilities, General Disclosures [Line Items]
Actual earnings adjustment mechanism incentives				$ 1,800,000	1,900,000	$ 2,600,000
Service Termination \| O&R \| Electric
Public Utilities, General Disclosures [Line Items]
Actual earnings adjustment mechanism incentives				0	$ 500,000	$ 200,000
Incentives reversed				$ 500,000

Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Operating Leases
2024	$ 67
2025	66
2026	66
2027	65
2028	60
All years thereafter	365
Total future minimum lease payments	689
Less: imputed interest	(144)
Total	545
Operating lease liabilities (current)	116	$ 103
Operating lease liabilities held for sale (current)	2
Operating lease liabilities (noncurrent)	429	$ 476
Operating lease liabilities held for sale (noncurrent)	5
Total	552
Finance Leases
2024	1
2025	0
2026	0
2027	0
2028	0
All years thereafter	1
Total future minimum lease payments	2
Less: imputed interest	0
Total	2
Other current liabilities	1
Other noncurrent liabilities	1
Total	$ 2
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	TOTAL CURRENT LIABILITIES	TOTAL CURRENT LIABILITIES
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Liabilities, Other than Long-Term Debt, Noncurrent	Liabilities, Other than Long-Term Debt, Noncurrent
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Liabilities, Other than Long-Term Debt, Noncurrent, Other Liabilities	Liabilities, Other than Long-Term Debt, Noncurrent, Other Liabilities
Broken Bow II
Operating Leases
2024	$ 3
2025	3
2026	3
2027	3
2028	3
All years thereafter	10
Less: imputed interest	(6)
Operating lease liabilities (current)	7
CECONY
Operating Leases
2024	66
2025	66
2026	66
2027	65
2028	60
All years thereafter	365
Total future minimum lease payments	688
Less: imputed interest	(143)
Total	545
Operating lease liabilities (current)	116	$ 103
Operating lease liabilities held for sale (current)	0
Operating lease liabilities (noncurrent)	429	$ 475
Operating lease liabilities held for sale (noncurrent)	0
Total	545
Finance Leases
2024	1
2025	0
2026	0
2027	0
2028	0
All years thereafter	0
Total future minimum lease payments	1
Less: imputed interest	0
Total	1
Other current liabilities	1
Other noncurrent liabilities	0
Total	$ 1

Income Tax - Schedule of Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income taxes, net of federal income taxes	5.00%	6.00%	4.00%
Taxes attributable to noncontrolling interests	0.00%	1.00%	3.00%
Cost of removal	1.00%	1.00%	2.00%
Other plant-related items	0.00%	0.00%	(1.00%)
Amortization of excess deferred federal income taxes	(6.00%)	(9.00%)	(12.00%)
Renewable energy credits	0.00%	(2.00%)	(2.00%)
Research and development credits	0.00%	0.00%	(1.00%)
Other	0.00%	0.00%	0.00%
Changes in state apportionments, net of federal income taxes	(0.01)	0.06	0
Deferred unamortized ITC recognized on sale of subsidiary	(0.04)	0	0
Effective tax rate	16.00%	24.00%	14.00%
CECONY
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income taxes, net of federal income taxes	5.00%	5.00%	5.00%
Taxes attributable to noncontrolling interests	0.00%	0.00%	0.00%
Cost of removal	2.00%	1.00%	1.00%
Other plant-related items	(1.00%)	(1.00%)	(1.00%)
Amortization of excess deferred federal income taxes	(8.00%)	(10.00%)	(11.00%)
Renewable energy credits	0.00%	0.00%	0.00%
Research and development credits	0.00%	0.00%	0.00%
Other	(1.00%)	0.00%	0.00%
Changes in state apportionments, net of federal income taxes	0	0	0
Deferred unamortized ITC recognized on sale of subsidiary	0	0	0
Effective tax rate	18.00%	16.00%	15.00%

Pension Benefits (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Total Periodic Benefit Costs

The components of the Companies’ total periodic benefit cost/(credit) for 2023, 2022 and 2021 were as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Service cost – including administrative expenses	$161	$287	$343	$151	$270	$321
Interest cost on projected benefit obligation	649	505	471	611	475	443
Expected return on plan assets	(1,114)	(1,168)	(1,096)	(1,061)	(1,109)	(1,040)
Recognition of net actuarial loss/(gain)	(232)	377	787	(219)	358	746
Recognition of prior service credit	(17)	(16)	(17)	(19)	(21)	(19)
TOTAL PERIODIC BENEFIT COST/(CREDIT)	$(553)	$(15)	$488	$(537)	$(27)	$451
Cost capitalized	(81)	(137)	(154)	(78)	(129)	(146)
Reconciliation to rate level	282	259	(226)	261	245	(216)
Total expense/(benefit) recognized	$(352)	$107	$108	$(354)	$89	$89

The components of the Companies’ total periodic postretirement benefit costs/(credit) for 2023, 2022 and 2021 were as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
Service cost	$14	$18	$22	$12	$15	$16
Interest cost on accumulated other postretirement benefit obligation	57	35	33	49	30	28
Expected return on plan assets	(70)	(72)	(68)	(56)	(58)	(56)
Recognition of net actuarial loss/(gain)	(16)	(14)	31	(8)	(9)	27
Recognition of prior service credit	(2)	(1)	(3)	—	—	(1)
TOTAL PERIODIC POSTRETIREMENT BENEFIT COST/(CREDIT)	$(17)	$(34)	$15	$(3)	$(22)	$14
Cost capitalized	(6)	(8)	(9)	(5)	(7)	(7)
Reconciliation to rate level	4	29	(7)	(2)	24	(12)
Total credit recognized	$(19)	$(13)	$(1)	$(10)	$(5)	$(5)

Schedule of Funded Status

The funded status at December 31, 2023, 2022 and 2021 was as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
CHANGE IN PROJECTED BENEFIT OBLIGATION
Projected benefit obligation at beginning of year	$12,113	$17,357	$18,965	$11,395	$16,341	$17,821
Service cost – excluding administrative expenses	156	283	337	146	266	317
Interest cost on projected benefit obligation	649	505	471	611	475	443
Net actuarial loss/(gain)	599	(5,102)	(1,547)	572	(4,845)	(1,441)
Plan amendments	3	—	—	—	—	—
Benefits paid	(808)	(930)	(869)	(747)	(842)	(799)
PROJECTED BENEFIT OBLIGATION AT END OF YEAR	$12,712	$12,113	$17,357	$11,977	$11,395	$16,341
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	$14,979	$18,504	$17,022	$14,248	$17,566	$16,147
Actual return on plan assets	1,261	(2,583)	1,935	1,201	(2,453)	1,838
Employer contributions	21	30	469	18	17	432
Benefits paid	(808)	(930)	(869)	(747)	(842)	(799)
Administrative expenses	(49)	(42)	(53)	(46)	(40)	(52)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	$15,404	$14,979	$18,504	$14,674	$14,248	$17,566
FUNDED STATUS	$2,692	$2,866	$1,147	$2,697	$2,853	$1,225
Unrecognized net loss/(gain)	$(757)	($1,485)	$205	$(705)	($1,397)	$207
Unrecognized prior service credits	(105)	(124)	(140)	(124)	(143)	(163)
Accumulated benefit obligation	$11,739	$11,167	$15,469	$11,031	$10,478	$14,504

The funded status of the programs at December 31, 2023, 2022 and 2021 were as follows:


	Con Edison			CECONY
(Millions of Dollars)	2023	2022	2021	2023	2022	2021
CHANGE IN BENEFIT OBLIGATION
Benefit obligation at beginning of year	$1,058	$1,398	$1,425	$921	$1,189	$1,209
Service cost	14	18	22	12	15	16
Interest cost on accumulated postretirement benefit obligation	57	35	33	49	30	28
Net actuarial gain	(93)	(311)	(13)	(94)	(239)	(3)
Benefits paid and administrative expenses, net of subsidies	(128)	(130)	(117)	(118)	(121)	(107)
Participant contributions	55	48	48	55	47	46
BENEFIT OBLIGATION AT END OF YEAR	$963	$1,058	$1,398	$825	$921	$1,189
CHANGE IN PLAN ASSETS
Fair value of plan assets at beginning of year	$860	$1,150	$1,115	$708	$955	$940
Actual return on plan assets	116	(225)	92	84	(187)	67
Employer contributions	22	13	6	17	10	3
Employer group waiver plan subsidies	56	55	21	52	50	19
Participant contributions	55	48	48	55	47	46
Benefits paid	(180)	(181)	(132)	(166)	(167)	(120)
FAIR VALUE OF PLAN ASSETS AT END OF YEAR	$929	$860	$1,150	$750	$708	$955
FUNDED STATUS	$(34)	$(198)	$(248)	$(75)	$(213)	$(234)
Unrecognized net loss/(gain)	($90)	$37	$41	($41)	$78	$67
Unrecognized prior service costs	(10)	(12)	(13)	—	—	—

Schedule of Assumptions

The actuarial assumptions were as follows:


	2023		2022		2021
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	5.15	%	5.45	%	3.00	%
Interest crediting rate for cash balance plan	4.20	%	4.00	%	3.50	%
Rate of compensation increase
CECONY	3.80	%	3.80	%	3.80	%
O&R	3.20	%	3.20	%	3.20	%
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount rate	5.45	%	3.00	%	2.55	%
Interest crediting rate for cash balance plan	4.00	%	3.50	%	3.00	%
Expected return on plan assets	6.75	%	7.00	%	7.00	%
Rate of compensation increase
CECONY	3.80	%	3.80	%	3.80	%
O&R	3.20	%	3.20	%	3.20	%

The actuarial assumptions were as follows:


	2023		2022		2021
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount Rate
CECONY	5.05	%	5.35	%	2.75	%
O&R	5.15	%	5.45	%	3.00	%
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
Discount Rate
CECONY	5.35	%	2.75	%	2.25	%
O&R	5.45	%	3.00	%	2.55	%
Expected Return on Plan Assets	6.80	%	6.80	%	6.80	%

Schedule of Expected Benefit Payments

Based on current assumptions, the Companies expect to make the following benefit payments over the next ten years:


(Millions of Dollars)	2024	2025	2026	2027	2028	2029-2033
Con Edison	$768	$817	$789	$804	$811	$4,158
CECONY	711	762	734	750	756	3,891

Based on current assumptions, the Companies expect to make the following benefit payments over the next ten years, net of receipt of governmental subsidies and participant contributions:


(Millions of Dollars)	2024	2025	2026	2027	2028	2029-2033
Con Edison	$68	$72	$73	$73	$73	$353
CECONY	60	63	64	64	64	308

Schedule of Plan Assets Allocations

The asset allocations for the pension plan at the end of 2023, 2022 and 2021, and the target allocation for 2024 are as follows:


	Target Allocation Range	Plan Assets at December 31,
Asset Category	2024	2023		2022		2021
Equity Securities	26% - 30%	26	%	33	%	50	%
Debt Securities	42% - 60%	50	%	50	%	38	%
Real Estate and Other Alternatives	14% - 30%	24	%	17	%	12	%
Total		100	%	100	%	100	%

The asset allocations for CECONY’s other postretirement benefit plans at the end of 2023, 2022 and 2021, and the target allocation for 2024 are as follows:


	Target Allocation Range	Plan Assets at December 31,
Asset Category	2024	2023		2022		2021
Equity Securities	35%-55%	44	%	49	%	55	%
Debt Securities	40%-60%	51	%	51	%	45	%
Real Estate and Other Alternatives	—%-9%	5	%	—	%	—	%
Total	100%	100	%	100	%	100	%

Schedule of Fair Value of Plan Assets

The fair values of the pension plan assets at December 31, 2023 by asset category are as follows:


(Millions of Dollars)	Level 1	Level 2	Total
Investments within the fair value hierarchy
U.S. Equity (a)	$2,474	$1	$2,475
International Equity (b)	1,584	—	1,584
U.S. Government Issued Debt (c)	—	615	615
Corporate Bonds Debt (d)	—	5,526	5,526
Structured Assets Debt (e)	—	132	132
Other Fixed Income Debt (f)	—	1,210	1,210
Cash and Cash Equivalents (g)	36	302	338
Futures (h)	19	—	19
Total investments within the fair value hierarchy	$4,113	$7,786	$11,899
Investments measured at NAV per share (n)
Private Equity (i)			1,031
Real Estate (j)			1,876
Hedge Funds (k)			723
Total investments valued using NAV per share			$3,630
Funds for retiree health benefits (l)	(52)	(96)	(148)
Funds for retiree health benefits measured at NAV per share (l)(n)			(45)
Total funds for retiree health benefits			$(193)
Investments (excluding funds for retiree health benefits)	$4,061	$7,690	$15,336
Pending activities (m)			68
Total fair value of plan net assets			$15,404