Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2019	Oct. 31, 2019
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-14514
Entity Registrant Name	Consolidated Edison, Inc.
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001047862
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		332,430,408
CECONY
Document Information [Line Items]
Entity File Number	1-1217
Entity Registrant Name	Consolidated Edison Company of New York, Inc.
Entity Central Index Key	0000023632
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

Consolidated Income Statement (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
OPERATING REVENUES
Total operating revenues	$ 3,365	$ 3,328	$ 9,623	$ 9,388
OPERATING EXPENSES
Depreciation and amortization	421	360	1,253	1,061
Taxes, other than income taxes	618	597	1,800	1,707
TOTAL OPERATING EXPENSES	2,498	2,502	7,512	7,381
OPERATING INCOME	867	826	2,111	2,007
OTHER INCOME (DEDUCTIONS)
Investment and other income	25	39	70	96
Other income	10	7	26	18
Allowance for equity funds used during construction	4	4	11	11
Other deductions	(25)	(61)	(76)	(154)
TOTAL OTHER INCOME (DEDUCTIONS)	14	(11)	31	(29)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	881	815	2,142	1,978
INTEREST EXPENSE
Interest on long-term debt	220	195	660	576
Other interest	45	13	122	28
Allowance for borrowed funds used during construction	(3)	(3)	(10)	(7)
NET INTEREST EXPENSE	262	205	772	597
INCOME BEFORE INCOME TAX EXPENSE	619	610	1,370	1,381
INCOME TAX EXPENSE	116	175	243	330
NET INCOME	503	435	1,127	1,051
Income attributable to non-controlling interest	30	0	79	0
NET INCOME FOR COMMON STOCK	$ 473	$ 435	$ 1,048	$ 1,051
Net income per common share - basic (dollars per share)	$ 1.42	$ 1.40	$ 3.20	$ 3.38
Net income per common share - diluted (dollars per share)	$ 1.42	$ 1.39	$ 3.19	$ 3.37
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (shares)	332.2	311.1	327.3	310.8
AVERAGE NUMBER OF SHARES OUTSTANDING—DILUTED (shares)	333.2	312.3	328.3	311.9
Electric
OPERATING REVENUES
Total operating revenues	$ 2,753	$ 2,783	$ 6,665	$ 6,611
Gas
OPERATING REVENUES
Total operating revenues	306	298	1,790	1,726
OPERATING EXPENSES
Operating costs	98	164	671	736
Steam
OPERATING REVENUES
Total operating revenues	58	64	469	474
Non-utility
OPERATING REVENUES
Total operating revenues	248	183	699	577
Power
OPERATING EXPENSES
Operating costs	483	545	1,203	1,287
Fuel
OPERATING EXPENSES
Operating costs	31	39	163	201
Other operations and maintenance
OPERATING EXPENSES
Operating costs	847	797	2,422	2,389
CECONY
OPERATING REVENUES
Total operating revenues	2,877	2,899	8,248	8,121
OPERATING EXPENSES
Depreciation and amortization	346	322	1,020	949
Taxes, other than income taxes	590	570	1,715	1,621
TOTAL OPERATING EXPENSES	2,154	2,135	6,423	6,271
OPERATING INCOME	723	764	1,825	1,850
OTHER INCOME (DEDUCTIONS)
Investment and other income	10	6	23	14
Allowance for equity funds used during construction	3	4	9	10
Other deductions	(22)	(43)	(63)	(123)
TOTAL OTHER INCOME (DEDUCTIONS)	(9)	(33)	(31)	(99)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	714	731	1,794	1,751
INTEREST EXPENSE
Interest on long-term debt	168	167	501	492
Other interest	16	10	52	23
Allowance for borrowed funds used during construction	(3)	(2)	(8)	(7)
NET INTEREST EXPENSE	181	175	545	508
INCOME BEFORE INCOME TAX EXPENSE	533	556	1,249	1,243
INCOME TAX EXPENSE	119	125	271	274
NET INCOME FOR COMMON STOCK	414	431	978	969
CECONY \| Electric
OPERATING REVENUES
Total operating revenues	2,544	2,571	6,174	6,107
CECONY \| Gas
OPERATING REVENUES
Total operating revenues	275	264	1,605	1,540
OPERATING EXPENSES
Operating costs	52	66	445	457
CECONY \| Steam
OPERATING REVENUES
Total operating revenues	58	64	469	474
CECONY \| Power
OPERATING EXPENSES
Operating costs	423	472	1,058	1,117
CECONY \| Fuel
OPERATING EXPENSES
Operating costs	31	39	163	201
CECONY \| Other operations and maintenance
OPERATING EXPENSES
Operating costs	$ 712	$ 666	$ 2,022	$ 1,926

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
NET INCOME	$ 503	$ 435	$ 1,127	$ 1,051
INCOME ATTRIBUTABLE TO NON-CONTROLLING INTEREST	(30)	0	(79)	0
NET INCOME	473	435	1,048	1,051
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	1	2	6	8
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	2	6	8
COMPREHENSIVE INCOME	474	437	1,054	1,059
CECONY
NET INCOME	414	431	978	969
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension and other postretirement benefit plan liability adjustments, net of taxes	1	0	1	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	0	1	1
COMPREHENSIVE INCOME	$ 415	$ 431	$ 979	$ 970

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

+ References + Details

- Definition

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

+ References

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+ Details

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net income	$ 1,127	$ 1,051
Net income	1,048	1,051
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,253	1,061
Deferred income taxes	257	308
Rate case amortization and accruals	(88)	(85)
Common equity component of allowance for funds used during construction	(11)	(11)
Net derivative gains	55	5
Unbilled revenue and net unbilled revenue deferrals	29	135
Gain on sale of assets	(5)	0
Other non-cash items, net	(25)	(44)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable – customers	8	(246)
Materials and supplies, including fuel oil and gas in storage	0	(4)
Revenue decoupling mechanism receivable	(91)	0
Other receivables and other current assets	103	(31)
Taxes receivable	39	47
Prepayments	(520)	(487)
Accounts payable	(67)	(8)
Pensions and retiree benefits obligations, net	253	264
Pensions and retiree benefits contributions	(353)	(475)
Accrued taxes	(27)	(60)
Accrued interest	95	67
Superfund and environmental remediation costs, net	(8)	(14)
Distributions from equity investments	46	88
System benefit charge	9	74
Deferred charges, noncurrent assets and other regulatory assets	(238)	(223)
Deferred credits and other regulatory liabilities	144	382
Other current and noncurrent liabilities	(25)	(194)
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,960	1,600
INVESTING ACTIVITIES
Utility construction expenditures	(2,428)	(2,457)
Cost of removal less salvage	(219)	(188)
Non-utility construction expenditures	(143)	(193)
Investments in electric and gas transmission projects	(159)	(123)
Investments in/acquisitions of renewable electric production projects	0	(15)
Proceeds from sale of assets	48	0
Other investing activities	17	29
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(2,884)	(2,947)
FINANCING ACTIVITIES
Net issuance/(payment) of short-term debt	(1,266)	775
Issuance of long-term debt	1,989	1,905
Retirement of long-term debt	(702)	(1,319)
Debt issuance costs	(15)	(21)
Common stock dividends	(690)	(631)
Issuance of common shares - public offering	825	0
Issuance of common shares for stock plans	40	39
Distribution to noncontrolling interest	(10)	0
NET CASH FLOWS FROM FINANCING ACTIVITIES	171	748
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(753)	(599)
BALANCE AT BEGINNING OF PERIOD	1,006	844
BALANCE AT END OF PERIOD	253	245
Cash paid/(received) during the period for:
Interest	576	519
Income taxes	(28)	(1)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	328	318
Issuance of common shares for dividend reinvestment	36	36
CECONY
Net income	978	969
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	1,020	949
Deferred income taxes	244	346
Rate case amortization and accruals	(87)	(98)
Common equity component of allowance for funds used during construction	(9)	(10)
Unbilled revenue and net unbilled revenue deferrals	38	43
Gain on sale of assets	(5)	0
Other non-cash items, net	(19)	(20)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable – customers	(2)	(218)
Materials and supplies, including fuel oil and gas in storage	9	(3)
Revenue decoupling mechanism receivable	(91)	0
Other receivables and other current assets	107	(47)
Accounts receivable from affiliated companies	14	(267)
Prepayments	(499)	(448)
Accounts payable	(92)	(32)
Accounts payable to affiliated companies	(4)	8
Pensions and retiree benefits obligations, net	237	242
Pensions and retiree benefits contributions	(322)	(436)
Accrued taxes	(23)	(63)
Accrued interest	68	67
Superfund and environmental remediation costs, net	(10)	(14)
System benefit charge	9	70
Accrued taxes to affiliated companies	0	(72)
Deferred charges, noncurrent assets and other regulatory assets	(248)	(158)
Deferred credits and other regulatory liabilities	184	376
Other current and noncurrent liabilities	(7)	(99)
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,490	1,085
INVESTING ACTIVITIES
Utility construction expenditures	(2,271)	(2,315)
Cost of removal less salvage	(214)	(183)
Proceeds from sale of assets	48	0
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(2,437)	(2,498)
FINANCING ACTIVITIES
Net issuance/(payment) of short-term debt	(262)	854
Issuance of long-term debt	700	1,640
Retirement of long-term debt	(475)	(1,236)
Debt issuance costs	(9)	(18)
Capital contribution by parent	875	95
Dividend to parent	(685)	(635)
NET CASH FLOWS FROM FINANCING ACTIVITIES	144	700
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(803)	(713)
BALANCE AT BEGINNING OF PERIOD	818	730
BALANCE AT END OF PERIOD	15	17
Cash paid/(received) during the period for:
Interest	439	424
Income taxes	13	268
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	295	279
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	80	100
Software Licenses \| CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	76	95
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	33	0
Equipment \| CECONY
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 33	$ 0

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and temporary cash investments	$ 78	$ 895
Accounts receivable - customers, less allowance for uncollectible accounts	1,254	1,267
Other receivables, less allowance for uncollectible accounts	169	285
Taxes receivable	10	49
Accrued unbilled revenue	505	514
Fuel oil, gas in storage, materials and supplies, at average cost	358	358
Prepayments	707	187
Regulatory assets	83	76
Restricted cash	175	111
Revenue decoupling mechanism	91	0
Other current assets	151	122
TOTAL CURRENT ASSETS	3,581	3,864
INVESTMENTS	1,983	1,766
UTILITY PLANT, AT ORIGINAL COST
General	3,492	3,331
TOTAL	47,549	45,371
Less: Accumulated depreciation	10,329	9,769
Net	37,220	35,602
Construction work in progress	1,963	1,978
NET UTILITY PLANT	39,183	37,580
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	3,848	4,000
Construction work in progress	203	169
NET PLANT	43,234	41,749
OTHER NONCURRENT ASSETS
Goodwill	446	440
Intangible assets, less accumulated amortization of $103 and $29 in 2019 and 2018, respectively	1,580	1,654
Regulatory assets	4,159	4,294
Operating lease right-of-use asset	834
Other deferred charges and noncurrent assets	123	153
TOTAL OTHER NONCURRENT ASSETS	7,142	6,541
TOTAL ASSETS	55,940	53,920
CURRENT LIABILITIES
Long-term debt due within one year	1,914	650
Term loan	0	825
Notes payable	1,300	1,741
Accounts payable	1,082	1,187
Customer deposits	348	351
Accrued taxes	35	61
Accrued interest	224	129
Accrued wages	115	109
Fair value of derivative liabilities	72	50
Regulatory liabilities	93	114
System benefit charge	636	627
Operating lease liabilities	59
Other current liabilities	341	363
TOTAL CURRENT LIABILITIES	6,219	6,207
NONCURRENT LIABILITIES
Provision for injuries and damages	139	146
Pensions and retiree benefits	810	1,228
Superfund and other environmental costs	767	779
Asset retirement obligations	360	450
Fair value of derivative liabilities	147	16
Deferred income taxes and unamortized investment tax credits	6,136	5,820
Operating lease liabilities	819
Regulatory liabilities	4,590	4,641
Other deferred credits and noncurrent liabilities	282	299
TOTAL NONCURRENT LIABILITIES	14,050	13,379
LONG-TERM DEBT	17,537	17,495
EQUITY
Common shareholders’ equity	17,959	16,726
Noncontrolling interest	175	113
TOTAL EQUITY (See Statement of Equity)	18,134	16,839
TOTAL LIABILITIES AND EQUITY	55,940	53,920
Electric
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	31,584	30,378
Gas
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	9,879	9,100
Steam
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,594	2,562
CECONY
CURRENT ASSETS
Cash and temporary cash investments	15	818
Accounts receivable - customers, less allowance for uncollectible accounts	1,160	1,163
Other receivables, less allowance for uncollectible accounts	104	211
Taxes receivable	0	5
Accrued unbilled revenue	374	392
Accounts receivable from affiliated companies	200	214
Fuel oil, gas in storage, materials and supplies, at average cost	295	304
Prepayments	616	117
Regulatory assets	69	64
Revenue decoupling mechanism	91	0
Other current assets	81	69
TOTAL CURRENT ASSETS	3,005	3,357
INVESTMENTS	436	385
UTILITY PLANT, AT ORIGINAL COST
General	3,201	3,056
TOTAL	44,543	42,508
Less: Accumulated depreciation	9,504	8,988
Net	35,039	33,520
Construction work in progress	1,843	1,850
NET UTILITY PLANT	36,882	35,370
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	3	4
NET PLANT	36,885	35,374
OTHER NONCURRENT ASSETS
Regulatory assets	3,831	3,923
Operating lease right-of-use asset	610	0
Other deferred charges and noncurrent assets	41	69
TOTAL OTHER NONCURRENT ASSETS	4,482	3,992
TOTAL ASSETS	44,808	43,108
CURRENT LIABILITIES
Long-term debt due within one year	350	475
Notes payable	930	1,192
Accounts payable	883	977
Accounts payable to affiliated companies	13	17
Customer deposits	335	339
Accrued taxes	33	55
Accrued interest	180	112
Accrued wages	104	99
Fair value of derivative liabilities	33	25
Regulatory liabilities	56	73
System benefit charge	578	569
Operating lease liabilities	49
Other current liabilities	269	267
TOTAL CURRENT LIABILITIES	3,813	4,200
NONCURRENT LIABILITIES
Provision for injuries and damages	135	141
Pensions and retiree benefits	577	952
Superfund and other environmental costs	684	693
Asset retirement obligations	301	292
Fair value of derivative liabilities	82	6
Deferred income taxes and unamortized investment tax credits	6,082	5,739
Operating lease liabilities	595
Regulatory liabilities	4,200	4,258
Other deferred credits and noncurrent liabilities	236	241
TOTAL NONCURRENT LIABILITIES	12,892	12,322
LONG-TERM DEBT	14,024	13,676
EQUITY
Common shareholders’ equity	14,079	12,910
TOTAL LIABILITIES AND EQUITY	44,808	43,108
CECONY \| Electric
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	29,736	28,595
CECONY \| Gas
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	9,012	8,295
CECONY \| Steam
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,594	$ 2,562

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Accounts receivable - customers, allowance for uncollectible accounts	$ 67	$ 62
Other receivables, allowance for uncollectible accounts	5	5
Non-utility property, accumulated depreciation	357	275
Intangible assets, accumulated amortization	103	29
CECONY
Accounts receivable - customers, allowance for uncollectible accounts	62	57
Other receivables, allowance for uncollectible accounts	3	3
Non-utility property, accumulated depreciation	$ 25	$ 25

Consolidated Statement of Equity/Shareholder's Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Capital Stock Expense	Accumulated Other Comprehensive Income/(Loss)	Non- controlling Interest	CECONY	CECONY Common Stock	CECONY Additional Paid-In Capital	CECONY Retained Earnings	CECONY Repurchased Con Edison Stock	CECONY Capital Stock Expense	CECONY Accumulated Other Comprehensive Income/(Loss)
Beginning Balance (shares) at Dec. 31, 2017		310			23
Beginning Balance (shares) at Dec. 31, 2017										235
Beginning Balance at Dec. 31, 2017	$ 15,425	$ 34	$ 6,298	$ 10,235	$ (1,038)	$ (85)	$ (26)	$ 7
Beginning Balance at Dec. 31, 2017									$ 12,439	$ 589	$ 4,649	$ 8,231	$ (962)	$ (62)	$ (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	428			428
Net income									389			389
Common stock dividends	(221)			(221)					(211)			(211)
Issuance of common shares for stock plans (shares)		1
Issuance of common shares for stock plans	25		25
Capital contribution by parent									45		45
Other comprehensive income	4						4		0
Distributions to noncontrolling interest	0
Ending Balance (shares) at Mar. 31, 2018		311			23
Ending Balance (shares) at Mar. 31, 2018										235
Ending Balance at Mar. 31, 2018	15,661	$ 34	6,323	10,442	$ (1,038)	(85)	(22)	7
Ending Balance at Mar. 31, 2018									12,662	$ 589	4,694	8,409	(962)	(62)	(6)
Beginning Balance (shares) at Dec. 31, 2017		310			23
Beginning Balance (shares) at Dec. 31, 2017										235
Beginning Balance at Dec. 31, 2017	15,425	$ 34	6,298	10,235	$ (1,038)	(85)	(26)	7
Beginning Balance at Dec. 31, 2017									12,439	$ 589	4,649	8,231	(962)	(62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,051
Net income	1,051								969
Other comprehensive income	8								1
Ending Balance (shares) at Sep. 30, 2018		311			23
Ending Balance (shares) at Sep. 30, 2018										235
Ending Balance at Sep. 30, 2018	15,898	$ 34	6,375	10,619	$ (1,038)	(85)	(18)	11
Ending Balance at Sep. 30, 2018									12,869	$ 589	4,744	8,565	(962)	(62)	(5)
Beginning Balance (shares) at Mar. 31, 2018		311			23
Beginning Balance (shares) at Mar. 31, 2018										235
Beginning Balance at Mar. 31, 2018	15,661	$ 34	6,323	10,442	$ (1,038)	(85)	(22)	7
Beginning Balance at Mar. 31, 2018									12,662	$ 589	4,694	8,409	(962)	(62)	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	188			188
Net income									149			149
Common stock dividends	(223)			(223)					(212)			(212)
Issuance of common shares for stock plans (shares)
Issuance of common shares for stock plans	27		27
Capital contribution by parent									25		25
Other comprehensive income	2						2		1						1
Distributions to noncontrolling interest	0
Ending Balance (shares) at Jun. 30, 2018		311			23
Ending Balance (shares) at Jun. 30, 2018										235
Ending Balance at Jun. 30, 2018	15,655	$ 34	6,350	10,407	$ (1,038)	(85)	(20)	7
Ending Balance at Jun. 30, 2018									12,625	$ 589	4,719	8,346	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	435			435
Net income	435								431			431
Common stock dividends	(223)			(223)					(212)			(212)
Issuance of common shares for stock plans (shares)
Issuance of common shares for stock plans	25		25
Capital contribution by parent									25		25
Other comprehensive income	2						2		0
Noncontrolling interest	4							4
Ending Balance (shares) at Sep. 30, 2018		311			23
Ending Balance (shares) at Sep. 30, 2018										235
Ending Balance at Sep. 30, 2018	15,898	$ 34	6,375	10,619	$ (1,038)	(85)	(18)	11
Ending Balance at Sep. 30, 2018									12,869	$ 589	4,744	8,565	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	331			331
Net income									227			227
Common stock dividends	(222)			(222)					(211)			(211)
Issuance of common shares – public offering (shares)		10
Issuance of common shares – public offering	705		719			(14)
Issuance of common shares for stock plans (shares)
Issuance of common shares for stock plans	23		23
Capital contribution by parent									25		25
Other comprehensive income	2						2		0
Noncontrolling interest	102							102
Ending Balance (shares) at Dec. 31, 2018		321			23
Ending Balance (shares) at Dec. 31, 2018										235
Ending Balance at Dec. 31, 2018	16,839	$ 34	7,117	10,728	$ (1,038)	(99)	(16)	113
Ending Balance at Dec. 31, 2018	16,726								12,910	$ 589	4,769	8,581	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	445			424				21
Net income									412			412
Common stock dividends	(237)			(237)					(228)			(228)
Issuance of common shares – public offering (shares)		6
Issuance of common shares – public offering	425		433			(8)
Issuance of common shares for stock plans	27		27
Capital contribution by parent									225		225
Other comprehensive income	4						4		0
Distributions to noncontrolling interest	(2)							(2)
Ending Balance (shares) at Mar. 31, 2019		327			23
Ending Balance (shares) at Mar. 31, 2019										235
Ending Balance at Mar. 31, 2019	17,501	$ 34	7,577	10,915	$ (1,038)	(107)	(12)	132
Ending Balance at Mar. 31, 2019									13,319	$ 589	4,994	8,765	(962)	(62)	(5)
Beginning Balance (shares) at Dec. 31, 2018		321			23
Beginning Balance (shares) at Dec. 31, 2018										235
Beginning Balance at Dec. 31, 2018	16,839	$ 34	7,117	10,728	$ (1,038)	(99)	(16)	113
Beginning Balance at Dec. 31, 2018	16,726								12,910	$ 589	4,769	8,581	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,127
Net income	1,048								978
Other comprehensive income	6								1
Ending Balance (shares) at Sep. 30, 2019		332			23
Ending Balance (shares) at Sep. 30, 2019										235
Ending Balance at Sep. 30, 2019	18,134	$ 35	8,031	11,051	$ (1,038)	(110)	(10)	175
Ending Balance at Sep. 30, 2019	17,959								14,079	$ 589	5,644	8,874	(962)	(62)	(4)
Beginning Balance (shares) at Mar. 31, 2019		327			23
Beginning Balance (shares) at Mar. 31, 2019										235
Beginning Balance at Mar. 31, 2019	17,501	$ 34	7,577	10,915	$ (1,038)	(107)	(12)	132
Beginning Balance at Mar. 31, 2019									13,319	$ 589	4,994	8,765	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	179			152				27
Net income									152			152
Common stock dividends	(242)			(242)					(228)			(228)
Issuance of common shares – public offering (shares)		5
Issuance of common shares – public offering	400	$ 1	402			(3)
Issuance of common shares for stock plans	29		29
Capital contribution by parent									625		625
Other comprehensive income	1						1		0
Distributions to noncontrolling interest	(3)							(3)
Ending Balance (shares) at Jun. 30, 2019		332			23
Ending Balance (shares) at Jun. 30, 2019										235
Ending Balance at Jun. 30, 2019	17,865	$ 35	8,008	10,825	$ (1,038)	(110)	(11)	156
Ending Balance at Jun. 30, 2019									13,868	$ 589	5,619	8,689	(962)	(62)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	503			473				30
Net income	473								414			414
Common stock dividends	(247)			(247)					(229)			(229)
Issuance of common shares for stock plans	23		23
Capital contribution by parent									25		25
Other comprehensive income	1						1		1						1
Distributions to noncontrolling interest	(11)							(11)
Ending Balance (shares) at Sep. 30, 2019		332			23
Ending Balance (shares) at Sep. 30, 2019										235
Ending Balance at Sep. 30, 2019	18,134	$ 35	$ 8,031	$ 11,051	$ (1,038)	$ (110)	$ (10)	$ 175
Ending Balance at Sep. 30, 2019	$ 17,959								$ 14,079	$ 589	$ 5,644	$ 8,874	$ (962)	$ (62)	$ (4)

General	9 Months Ended
General	Sep. 30, 2019
Accounting Policies [Abstract]
General	General These combined notes accompany and form an integral part of the separate consolidated financial statements of each of the two separate registrants: Consolidated Edison, Inc. and its subsidiaries (Con Edison) and Consolidated Edison Company of New York, Inc. and its subsidiaries (CECONY). CECONY is a subsidiary of Con Edison and as such its financial condition and results of operations and cash flows, which are presented separately in the CECONY consolidated financial statements, are also consolidated, along with those of Orange and Rockland Utilities, Inc. (O&R), Con Edison Clean Energy Businesses, Inc. (together with its subsidiaries, the Clean Energy Businesses) and Con Edison Transmission, Inc. (together with its subsidiaries, Con Edison Transmission) in Con Edison’s consolidated financial statements. The term “Utilities” is used in these notes to refer to CECONY and O&R. As used in these notes, the term “Companies” refers to Con Edison and CECONY and, except as otherwise noted, the information in these combined notes relates to each of the Companies. However, CECONY makes no representation as to information relating to Con Edison or the subsidiaries of Con Edison other than itself. The separate interim consolidated financial statements of each of the Companies are unaudited but, in the opinion of their respective managements, reflect all adjustments (which include only normally recurring adjustments) necessary for a fair presentation of the results for the interim periods presented. The Companies’ separate interim consolidated financial statements should be read together with their separate audited financial statements (including the combined notes thereto) included in Item 8 of their combined Annual Report on Form 10-K for the year ended December 31, 2018 and their separate unaudited financial statements (including the combined notes thereto) included in Part 1, Item 1 of their combined Quarterly Report on Form 10-Q for the quarterly periods ended March 31, 2019 and June 30, 2019. Con Edison has two regulated utility subsidiaries: CECONY and O&R. CECONY provides electric service and gas service in New York City and Westchester County. The company also provides steam service in parts of Manhattan. O&R, along with its regulated utility subsidiary, provides electric service in southeastern New York and northern New Jersey and gas service in southeastern New York. Con Edison Clean Energy Businesses, Inc. has three subsidiaries: Consolidated Edison Development, Inc. (Con Edison Development), a company that develops, owns and operates renewable and energy infrastructure projects; Consolidated Edison Energy, Inc. (Con Edison Energy), a company that provides energy-related products and services to wholesale customers; and Consolidated Edison Solutions, Inc. (Con Edison Solutions), a company that provides energy-related products and services to retail customers. Con Edison Transmission, Inc. invests in electric transmission facilities through its subsidiary, Consolidated Edison Transmission, LLC (CET Electric), and invests in gas pipeline and storage facilities through its subsidiary Con Edison Gas Pipeline and Storage, LLC (CET Gas).

Summary of Significant Accounting Policies and Other Matters

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies and Other Matters

Revenue Recognition

The following table presents, for the three and nine months ended September 30, 2019 and 2018, 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.



	For the Three Months Ended September 30, 2019				For the Three Months Ended September 30, 2018
(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
CECONY
Electric	$2,582		$(38)	$2,544	$2,631		$(60)		$2,571
Gas	263		12	275	264		—		264
Steam	54		4	58	64		—		64
Total CECONY	$2,899		$(22)	$2,877	$2,959		$(60)		$2,899
O&R
Electric	205		5	210	215		(3)		212
Gas	25		6	31	31		3		34
Total O&R	$230		$11	$241	$246			$—	$246
Clean Energy Businesses
Renewables	193	(b)	—	193	68	(b)	—		68
Energy services	14		—	14	24		—		24
Other	—		40	40	—		89		89
Total Clean Energy Businesses	$207		$40	$247	$92		$89		$181
Con Edison Transmission	1		—	1	1		—		1
Other (c)	—		(1)	(1)	—		1		1
Total Con Edison	$3,337		$28	$3,365	$3,298		$30		$3,328

(a) For the Utilities, this includes revenue from alternative revenue programs, such as the revenue decoupling mechanisms under their New York electric and gas rate plans.For the Clean Energy Businesses, this includes revenue from wholesale services.

(b) Included within the totals for Renewables revenue at the Clean Energy Businesses is $3 million for the three months ended September 30, 2019 and 2018, of revenue related to engineering, procurement and construction services.


(c)	Parent company and consolidation adjustments.



	For the Nine Months Ended September 30, 2019				For the Nine Months Ended September 30, 2018
(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
CECONY
Electric	$6,048		$126	$6,174	$6,106		$1	$6,107
Gas	1,573		32	1,605	1,516		24	1,540
Steam	456		13	469	467		7	474
Total CECONY	$8,077		$171	$8,248	$8,089		$32	$8,121
O&R
Electric	488		5	493	508		(3)	505
Gas	178		7	185	179		7	186
Total O&R	$666		$12	$678	$687		$4	$691
Clean Energy Businesses
Renewables	465	(b)	—	465	273	(b)	—	273
Energy services	53		—	53	65		—	65
Other	—		178	178	—		235	235
Total Clean Energy Businesses	$518		$178	$696	$338		$235	$573
Con Edison Transmission	3		—	3	3		—	3
Other (c)	—		(2)	(2)	—		—	—
Total Con Edison	$9,264		$359	$9,623	$9,117		$271	$9,388

(b) Included within the totals for Renewables revenue at the Clean Energy Businesses is $9 million and $100 million for the nine months ended September 30, 2019 and 2018, respectively, of revenue related to engineering, procurement and construction services.


(c)	Parent company and consolidation adjustments.



	2019			2018
(Millions of Dollars)	Unbilled contract revenue (a)	Unearned revenue (b)		Unbilled contract revenue (a)	Unearned revenue (b)
Beginning balance as of January 1,	$29	$20		$58	$87
Additions (c)	63	2		111	34
Subtractions (c)	68	2	(d)	138	105	(d)
Ending balance as of September 30,	$24	$20		$31	$16

(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, $2 million and $50 million were included in the balance as of January 1, 2019 and 2018, respectively.

As of September 30, 2019, the aggregate amount of the remaining fixed performance obligations of the Clean Energy Businesses under contracts with customers for energy services is $89 million, of which $53 million will be recognized within the next two years, and the remaining $36 million will be recognized pursuant to long-term service and maintenance agreements.

Utility Plant

General utility plant of Con Edison and CECONY included $95 million and $90 million, respectively, at September 30, 2019 and $100 million and $95 million, respectively, at December 31, 2018, related to a May 2018 acquisition of software licenses. The estimated aggregate annual amortization expense related to the software licenses for Con Edison and CECONY is $7 million. The accumulated amortization for Con Edison and CECONY was $8 million at September 30, 2019 and was $3 million at December 31, 2018.

Long-Lived and Intangible Assets

In January 2019, Pacific Gas and Electric Company (PG&E) filed in the United States Bankruptcy Court for the Northern District of California for reorganization under Chapter 11 of the U.S. Bankruptcy Code. The output of certain Con Edison Development renewable electric production projects with an aggregate generating capacity of 680 MW (AC) (PG&E Projects) is sold to PG&E under long-term power purchase agreements (PG&E PPAs). Most of the PG&E PPAs have contract prices that are higher than estimated market prices. PG&E, as a debtor in possession, may assume or reject the PG&E PPAs, subject to review by the bankruptcy court. In September 2019, PG&E submitted its plan of reorganization to the bankruptcy court. PG&E’s plan includes the assumption by PG&E of all of its power purchase agreements. PG&E’s plan is subject to, among other things: confirmation by the bankruptcy court by June 30, 2020 (or any extension of the date by which PG&E’s bankruptcy must be resolved for PG&E to participate in the insurance fund described below); approval by the California Public Utilities Commission (CPUC) of PG&E’s implementation of the plan and participation in the insurance fund; and PG&E obtaining funding for distributions under the plan. PG&E may revoke, withdraw or delay consideration of the plan prior to its confirmation by the bankruptcy court, and file subsequent amended plans of reorganization. In October 2019, the Ad Hoc PG&E senior note holder committee (Noteholders) and tort claimant committee (TCC) submitted to the bankruptcy court an alternative plan of reorganization for PG&E. The Noteholder/TCC plan also calls for PG&E to assume all of its power purchase agreements and participate in the insurance fund. The Noteholder/TCC plan is also subject to, among other things, confirmation by the bankruptcy court, approval by the CPUC and obtaining funding for distributions under the plan. The Noteholder/TCC plan can be revoked, amended, withdrawn or delayed. Bankruptcy court approval is required for a plan of reorganization to be sent to creditors for consideration.

In January and May 2019, FERC issued orders (which PG&E is challenging) affirming its jurisdiction to review and approve the modification or abrogation of wholesale power contracts that are the subject of rejection in bankruptcy. In June 2019, the bankruptcy court ruled that FERC does not have concurrent jurisdiction with it and that FERC’s January and May 2019 orders are of no force and effect in the bankruptcy proceeding. FERC and additional parties, including Con Edison Development, are challenging the bankruptcy court’s June 2019 ruling in appeals that are pending in the United States Court of Appeals for the Ninth Circuit.

In July 2019, California enacted a law addressing future California wildfires. The law includes provisions for the establishment of wildfire liquidity and insurance funds and possible limitation of future wildfire liabilities for California utilities. PG&E, Southern California Edison Company and San Diego Gas & Electric Company have agreed to participate in the insurance fund. PG&E’s participation will require bankruptcy court approval and is conditioned on, among other things, resolution of PG&E’s bankruptcy by June 30, 2020, and a determination by the CPUC that PG&E’s bankruptcy reorganization plan is consistent with the state’s climate goals as required under the California Renewables Portfolio Standard Program and related procurement requirements of the state.

The PG&E bankruptcy is an event of default under the PG&E PPAs. Unless the lenders for the related project debt otherwise agree, distributions from the related projects to Con Edison Development will not be made during the pendency of the bankruptcy. See “Reconciliation of Cash, Temporary Cash Investments and Restricted Cash,” below.

At September 30, 2019, Con Edison’s consolidated balance sheet included $827 million of net non-utility plant relating to the PG&E Projects, $1,075 million of intangible assets relating to the PG&E PPAs, $287 million of net non-utility plant of additional projects that secure the related project debt and $1,012 million of non-recourse related project debt. See Note C. Con Edison has tested whether its net non-utility plant relating to the PG&E Projects and intangible assets relating to the PG&E PPAs have been impaired. The projected future cash flows used in the test reflected Con Edison’s expectation that the PG&E PPAs are not likely to be rejected. Based on the test, Con Edison has determined that there was no impairment. If, in the future, one or more of the PG&E PPAs is rejected or any such rejection becomes likely, there will be an impairment of the related intangible assets and could be an impairment of the related non-utility plant. The amount of any such impairment could be material.

Acquisitions and Investments

For the nine months ended September 2019, the Clean Energy Businesses reclassified approximately $100 million related to the purchase price adjustments for the December 2018 acquisition by a Con Edison Development subsidiary of Sempra Solar Holdings, LLC. The adjustments primarily decreased property, plant and equipment and asset retirement obligations, and were recorded within the one year available to finalize the purchase price allocation, including working capital and other closing adjustments.

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 and its common shares that are subject to a May 2019 forward sale agreement (see Note C). Before the issuance of common shares upon settlement of the forward sale agreement, the shares will be reflected in the company’s diluted earnings per share calculations using the treasury stock method. Under this method, the number of common shares used in calculating diluted earnings per share is deemed to be increased by the excess, if any, of the number of shares that would be issued upon physical settlement of the forward sale agreement over the number of shares that could be purchased by the company in the market (based on the average market price during the period) using the proceeds due upon physical settlement (based on the adjusted forward sale price at the end of the reporting period).

For the three and nine months ended September 30, 2019 and 2018, basic and diluted EPS for Con Edison are calculated as follows:



	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
(Millions of Dollars, except per share amounts/Shares in Millions)	2019	2018	2019	2018
Net income for common stock	$473	$435	$1,048	$1,051
Weighted average common shares outstanding – basic	332.2	311.1	327.3	310.8
Add: Incremental shares attributable to effect of potentially dilutive securities	1.0	1.2	1.0	1.1
Adjusted weighted average common shares outstanding – diluted	333.2	312.3	328.3	311.9
Net Income per common share – basic	$1.42	$1.40	$3.20	$3.38
Net Income per common share – diluted	$1.42	$1.39	$3.19	$3.37

The computation of diluted EPS for the three and nine months ended September 30, 2018 excludes immaterial amounts of performance share awards that were not included because of their anti-dilutive effect.

Changes in Accumulated Other Comprehensive Income/(Loss) by Component

For the three and nine months ended September 30, 2019 and 2018, changes to accumulated other comprehensive income/(loss) (OCI) for Con Edison and CECONY are as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance, accumulated OCI, net of taxes (a)	$(11)	$(20)	$(5)	$(5)
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2019 and 2018 (a)(b)	1	2	1	—
Current period OCI, net of taxes	1	2	1	—
Ending balance, accumulated OCI, net of taxes	$(10)	$(18)	$(4)	$(5)



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance, accumulated OCI, net of taxes (a)	$(16)	$(26)	$(5)	$(6)
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018	2	3	—	—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) and $(2) for Con Edison in 2019 and 2018, respectively (a)(b)	4	5	1	1
Current period OCI, net of taxes	6	8	1	1
Ending balance, accumulated OCI, net of taxes	$(10)	$(18)	$(4)	$(5)


(a)	Tax reclassified from accumulated OCI is reported in the income tax expense line item of the consolidated income statement.


(b)	For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of total periodic pension and other postretirement benefit cost. See Notes E and F.

Reconciliation of Cash, Temporary Cash Investments and Restricted Cash

Cash, temporary cash investments and restricted cash are presented on a combined basis in the Companies’ consolidated statements of cash flows. At September 30, 2019 and 2018, cash, temporary cash investments and restricted cash for Con Edison and CECONY are as follows:



	At September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Cash and temporary cash investments	$78	$199	$15	$17
Restricted cash (a)	175	46	—	—
Total cash, temporary cash investments and restricted cash	$253	$245	$15	$17

(a)

Restricted cash included cash of Con Edison Development renewable electric production project subsidiaries ($174 million and $44 million at September 30, 2019 and 2018, respectively) that, under the related project debt agreements, is either restricted until the various maturity dates of the project debt to being used for normal operating expenses and capital expenditures, debt service, and required reserves or

restricted as a result of the PG&E bankruptcy. During the pendency of the PG&E bankruptcy, unless the lenders for the related project debt otherwise agree, cash may not be distributed from the related projects to Con Edison Development. See “Long-Lived and Intangible Assets,” above, and Note C. In addition, restricted cash included O&R's New Jersey utility subsidiary, Rockland Electric Company transition bond charge collections, net of principal, interest, trustee and service fees ($1 million and $2 million at September 30, 2019 and 2018, respectively).

Regulatory Matters

9 Months Ended

Sep. 30, 2019

Regulated Operations [Abstract]

Regulatory Matters

Rate Plans

In October 2019, CECONY, the staff of the New York State Public Service Commission (NYSPSC) and other parties entered into a Joint Proposal for CECONY electric and gas rate plans for the three-year period January 2020 through December 2022. The Joint Proposal is subject to NYSPSC approval. The following tables contain a summary of the rate plans.



CECONY Electric
Effective period		January 2020 – December 2022 (c)
Base rate changes (a)		Yr. 1 – $113 million Yr. 2 – $370 million Yr. 3 – $326 million
Amortizations to income of net regulatory liabilities (b)		Yr. 1 – $267 million Yr. 2 – $269 million Yr. 3 – $272 million
Other revenue sources		Retention of $75 million of annual transmission congestion revenues. Potential earnings adjustment mechanism incentives for energy efficiency and other potential incentives of up to: Yr. 1 - $69 million; Yr. 2 - $74 million; and Yr. 3 - $79 million.
Revenue decoupling mechanism		Continuation of reconciliation of actual to authorized electric delivery revenues.
Recoverable energy costs		Continuation of current rate recovery of purchased power and fuel costs.
Negative revenue adjustments		Potential charges if certain performance targets relating to service, reliability, safety and other matters are not met: Yr. 1 - $450 million; Yr. 2 - $461 million; and Yr. 3 - $476 million.
Cost reconciliations		Continuation of reconciliation of expenses for pension and other postretirement benefits, variable-rate debt, major storms, property taxes (d), municipal infrastructure support costs (e), the impact of new laws and environmental site investigation and remediation to amounts reflected in rates. (f)
Net utility plant reconciliations		Target levels reflected in rates: Electric average net plant target excluding advanced metering infrastructure (AMI): Yr. 1 - $24,572 million; Yr. 2 - $25,366 million; Yr. 3 - $26,197 million AMI: Yr. 1 - $572 million; Yr. 2 - $740 million; Yr. 3 - $806 million (g)
Average rate base		Yr. 1 - $21,660 million Yr. 2 - $22,783 million Yr. 3 - $23,926 million
Weighted average cost of capital (after-tax)		6.61 percent
Authorized return on common equity		8.80 percent
Earnings sharing		Most earnings above an annual earnings threshold of 9.3 percent are to be applied to reduce regulatory assets for environmental remediation and other costs accumulated in the rate year.
Cost of long-term debt		4.63 percent
Common equity ratio		48 percent

(a)

Base rates reflect recovery by the company of certain costs of its energy efficiency, Reforming the Energy Vision demonstration projects, non-wire alternative projects (including the Brooklyn Queens demand management program), and off-peak electric vehicle charging programs (Yr. 1 - $206 million; Yr. 2 - $245 million; and Yr. 3 - $251 million) over a ten-year period, including the overall pre-tax rate of return on such costs.

(b)

Amounts reflect amortization of the 2018 tax savings under the federal Tax Cuts and Jobs Act of 2017 (TCJA) allocable to CECONY’s electric customers ($377 million) over a three-year period ($126 million annually), the protected portion of the regulatory liability for excess deferred income taxes allocable to CECONY’s electric customers ($1,663 million) over the remaining lives of the related assets ($49 million in Yr. 1, $50 million in Yr. 2, and $53 million in Yr. 3) and the unprotected portion of the net regulatory liability ($784 million) over five years ($157 million annually). Amounts also reflect amortization of the regulatory asset for deferred MTA power reliability costs ($238 million) over a 5-year period ($48 million annually).


(c)	If at the end of any semi-annual period ending June 30 and December 31, Consolidated Edison Inc.’s investments in its non-utility businesses exceed 15 percent of its total consolidated revenues, assets or cash flow, or if the ratio of holding company debt to total

consolidated debt rises above 20 percent, CECONY is required to notify the NYSPSC and submit a ring-fencing plan or a demonstration why additional ring-fencing measures are not necessary.


(d)	Deferrals for property taxes are limited to 90 percent of the difference from amounts reflected in rates, subject to an annual maximum for the remaining difference of not more than a maximum number of basis points impact on return on common equity: Yr. 1 - 10.0 basis points; Yr. 2 - 7.5 basis points; and Yr. 3 - 5.0 basis points.

(e)

In general, if actual expenses for municipal infrastructure support (other than company labor) are below the amounts reflected in rates the company will defer the difference for credit to customers, and if the actual expenses are above the amount reflected in rates the company will defer for recovery from customers 80 percent of the difference subject to a maximum deferral, subject to certain exceptions, of 15 percent of the amount reflected in rates.


(f)	In addition, the NYSPSC staff has commenced a focused operations audit to investigate the income tax accounting of CECONY and other New York utilities. Any NYSPSC-ordered adjustment to CECONY’s income tax accounting will be refunded to or collected from customers, as determined by the NYSPSC.


(g)	Reconciliation of net utility plant for AMI will be done on a combined basis for electric and gas.



CECONY Gas
Effective period		January 2020 – December 2022 (c)
Base rate changes (a)		Yr. 1 – $84 million Yr. 2 – $122 million Yr. 3 – $167 million
Amortizations to income of net regulatory liabilities (b)		Yr. 1 – $45 million Yr. 2 – $43 million Yr. 3 – $10 million
Other revenue sources		Retention of annual revenues from non-firm customers of up to $65 million and 15 percent of any such revenues above $65 million. Potential earnings adjusted mechanism incentives for energy efficiency and other potential incentives of up to Yr. 1 - $20 million; Yr. 2 - $22 million; and Yr. 3 - $25 million
Revenue decoupling mechanism		Continuation of reconciliation of actual to authorized gas delivery revenues, modified to be calculated based upon revenue per customer class instead of revenue per customer.
Recoverable energy costs		Continuation of current rate recovery of purchased gas costs.
Negative revenue adjustments		Potential charges if performance targets relating to service, safety and other matters are not met: Yr. 1 - $81 million; Yr. 2 - $88 million; and Yr. 3 - $96 million.
Cost reconciliations		Continuation of reconciliation of expenses for pension and other postretirement benefits, variable-rate debt, major storms, property taxes (d), municipal infrastructure support costs (e), the impact of new laws and environmental site investigation and remediation to amounts reflected in rates. (f)
Net utility plant reconciliations		Target levels reflected in rates: Gas average net plant target excluding AMI: Yr. 1 - $8,123 million; Yr. 2 - $8,861 million; Yr. 3 - $9,600 million AMI: Yr. 1 - $142 million; Yr. 2 - $183 million; Yr. 3 - $211 million (g)
Average rate base		Yr. 1 - $7,171 million Yr. 2 - $7,911 million Yr. 3 - $8,622 million
Weighted average cost of capital (after-tax)		6.61 percent
Authorized return on common equity		8.80 percent
Earnings sharing		Most earnings above an annual earnings threshold of 9.3 percent are to be applied to reduce regulatory assets for environmental remediation and other costs accumulated in the rate year.
Cost of long-term debt		4.63 percent
Common equity ratio		48 percent

(a)

At the NYSPSC’s option, the gas base rate increases shown above may be implemented with increases of $47 million in Yr. 1; $176 million in Yr. 2; and $170 million in Yr. 3. Base rates reflect recovery by the company of certain costs of its energy efficiency program (Yr. 1 - $30 million; Yr. 2 - $37 million; and Yr. 3 - $40 million) over a ten-year period, including the overall pre-tax rate of return on such costs.

(b)

Amounts reflect amortization of the remaining 2018 TCJA tax savings allocable to CECONY’s gas customers ($63 million) over a two year period ($32 annually), the protected portion of the regulatory liability for excess deferred income taxes allocable to CECONY’s gas customers ($725 million) over the remaining lives of the related assets ($14 million in Yr. 1, $14 million in Yr. 2, and $12 million in Yr. 3) and the unprotected portion of the net regulatory liability ($107 million) over five years ($21 million annually)


(c)-(g)	See footnotes (c), (d), (e), (f) and (g) to the table under “CECONY Electric,” above.

O&R New York – Electric and Gas

In March 2019, the NYSPSC approved the November 2018 Joint Proposal for new electric and gas rates. The Joint Proposal provides for electric rate increases of $13.4 million, $8.0 million and $5.8 million, effective January 1, 2019, 2020 and 2021, respectively. The Joint Proposal provides for a gas rate decrease of $7.5 million, effective January 1, 2019, and gas rate increases of $3.6 million and $0.7 million, effective January 1, 2020 and 2021, respectively.

Rockland Electric Company (RECO)

In October 2019, the New Jersey Division of Rate Counsel staff submitted testimony in the New Jersey Board of Public Utilities proceeding in which RECO requested an electric rate increase, effective February 2020. The Division of Rate Counsel staff testimony supports an electric rate increase of $5.8 million reflecting, among other things, an 8.9 percent return on common equity and a common equity ratio of 47.14 percent. In October 2019, RECO filed an update to the request it filed in May 2019. The company increased its requested February 2020 rate increase from $19.9 million to $20.3 million. The updated filing reflects an increase to the common equity ratio from 49.93 percent to 50.16 percent and a decrease in the return on common equity from 10.00 percent to 9.60 percent.

Other Regulatory Matters

In August and November 2017, the NYSPSC issued orders in its proceeding investigating an April 21, 2017 Metropolitan Transportation Authority (MTA) subway power outage. The orders indicated that the investigation determined that the outage was caused by a failure of CECONY’s electricity supply to a subway station, which led to a loss of the subway signals, and that one of the secondary services to the MTA facility had been improperly rerouted and was not properly documented by the company. The orders also indicated that the loss of power to the subway station affected multiple subway lines and caused widespread delays across the subway system. Pursuant to the orders, the company was required to take certain actions, including inspecting, repairing and installing certain electrical equipment that serves the subway system, analyzing power supply and power quality events affecting the MTA’s signaling services, and filing monthly reports with the NYSPSC on all of the company's activities related to the subway system. The company completed the required actions in 2018. The company’s costs related to this matter in excess of those reflected in its current electric rate plan were deferred as a regulatory asset and are addressed in the October 2019 Joint Proposal (see footnote (b) to the CECONY - Electric table under “Rate Plans,” above).

In August 2018, the NYSPSC ordered CECONY to begin on January 1, 2019 to credit the company's electric and gas customers, and to begin on October 1, 2018 to credit its steam customers, with the net benefits of the federal Tax Cuts and Jobs Act of 2017 (TCJA) as measured based on amounts reflected in its rate plans prior to the enactment of the TCJA in December 2017. The net benefits include the revenue requirement impact of the reduction in the corporate federal income tax rate to 21 percent, the elimination for utilities of bonus depreciation and the amortization of excess deferred federal income taxes. CECONY estimates that its credit of net benefits of the TCJA to its electric, gas and steam customers in 2019 will amount to $259 million, $113 million and $25 million, respectively. CECONY’s net benefits prior to January 1, 2019 and its net regulatory liability for future income taxes, including both the protected and unprotected portions, allocable to the company’s electric and gas customers are addressed in the October 2019 Joint Proposal (see footnote (b) to the CECONY - Electric and Gas tables under “Rate Plans,” above). CECONY’s net benefits prior to October 1, 2018 allocable to the company’s steam customers ($15 million) are being amortized over a three-year period. CECONY’s net regulatory liability for future income taxes, including both the protected and unprotected portions, allocable to the company’s steam customers ($185 million) is being amortized over the remaining lives of the related assets (with the amortization period for the unprotected portion subject to review in its next steam rate proceeding).

In January 2018, the NYSPSC issued an order initiating a focused operations audit of the income tax accounting of certain utilities, including CECONY and O&R. The Utilities are unable to estimate the amount or range of their possible loss related to this matter. At September 30, 2019, the Utilities had not accrued a liability related to this matter.

In March 2018, Winter Storms Riley and Quinn caused damage to the Utilities’ electric distribution systems and interrupted service to approximately 209,000 CECONY customers, 93,000 O&R customers and 44,000 RECO customers. At September 30, 2019, CECONY's costs related to March 2018 storms, including Riley and Quinn, amounted to $134 million, including operation and maintenance expenses reflected in its electric rate plan ($15 million), operation and maintenance expenses charged against a storm reserve pursuant to its electric rate plan

($84 million), capital expenditures ($29 million) and removal costs ($6 million). At September 30, 2019, O&R and RECO costs related to 2018 storms amounted to $43 million and $17 million, respectively, most of which were deferred as regulatory assets pursuant to their electric rate plans. In January 2019, O&R began recovering its deferred storm costs over a six year period in accordance with its New York electric rate plan. The NYSPSC investigated the preparation and response to the storms by CECONY, O&R, and other New York electric utilities, including all aspects of their emergency response plans. In April 2019, following the issuance of a NYSPSC staff report on the investigation, the NYSPSC ordered the utilities to show cause why the NYSPSC should not commence a penalty action against them for violating their emergency response plans. The Utilities are unable to estimate the amount or range of their possible loss related to this matter. At September 30, 2019, the Utilities had not accrued a liability related to this matter.

In May 2018, FERC denied a complaint the NJBPU filed with FERC seeking the re-allocation to CECONY of certain PJM Interconnection LLC (PJM) transmission costs that had been allocated to the company prior to April 2017 when transmission service provided to the company pursuant to the PJM open access transmission tariff terminated. The transmission service terminated because the company did not exercise its option to continue the service following a series of requests PJM had submitted to FERC that substantially increased the charges for the transmission service. CECONY challenged each of these requests. FERC rejected all but one of CECONY’s protests. In June 2015 and May 2016, CECONY filed appeals of certain FERC decisions with the U.S. Court of Appeals. In July 2018, FERC established a settlement proceeding relating to the allocation of PJM transmission costs. Under CECONY’s electric rate plan, unless and until changed by the NYSPSC, the company will recover all charges incurred associated with the transmission service.

In July 2018, the NYSPSC commenced an investigation into the rupture of a CECONY steam main (see Note H).

In March 2019, the NYSPSC ordered CECONY to show cause why the NYSPSC should not commence a penalty action and prudence proceeding against CECONY for alleged violations of gas operator qualification, performance, and inspection requirements. The company is seeking to resolve this matter through settlement negotiations with the NYSPSC staff. Any settlement would be subject to NYSPSC approval. The company is unable to estimate the amount or range of its possible loss related to this matter. At September 30, 2019, the company had not accrued a liability related to this matter.

On July 13, 2019, electric service was interrupted to approximately 72,000 CECONY customers on the west side of Manhattan. The NYSPSC and the Northeast Power Coordinating Council, a regional reliability entity, are investigating the July 13, 2019 power outage. The NYSPSC is also investigating other CECONY power outages that occurred in July 2019. Pursuant to the reliability performance provisions of its electric rate plan, as a result of the July 13, 2019 power outage, the company is subject to a $5 million negative revenue adjustment (which it recognized in the third quarter of 2019). The company is unable to estimate the amount or range of its possible additional loss related to the power outages. At September 30, 2019, the company had accrued a $5 million liability related to the power outages.

Regulatory Assets and Liabilities

Regulatory assets and liabilities at September 30, 2019 and December 31, 2018 were comprised of the following items:



	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Regulatory assets
Unrecognized pension and other postretirement costs	$1,919	$2,238	$1,816	$2,111
Environmental remediation costs	774	810	685	716
Revenue taxes	315	291	302	278
MTA power reliability deferral	245	229	245	229
Property tax reconciliation	160	101	150	86
Deferred derivative losses	99	17	90	11
Municipal infrastructure support costs	80	67	80	67
Pension and other postretirement benefits deferrals	77	73	55	56
Deferred storm costs	69	76	—	—
System peak reduction and energy efficiency programs	60	72	59	70
Meadowlands heater odorization project	35	36	35	36
Brooklyn Queens demand management program	35	39	35	39
Unamortized loss on reacquired debt	30	36	28	34
Preferred stock redemption	22	23	22	23
Recoverable REV demonstration project costs	21	20	18	18
Gate station upgrade project	19	17	19	17
Workers’ compensation	5	5	5	5
O&R transition bond charges	—	2	—	—
Other	194	142	187	127
Regulatory assets – noncurrent	4,159	4,294	3,831	3,923
Deferred derivative losses	68	36	57	29
Recoverable energy costs	15	40	12	35
Regulatory assets – current	83	76	69	64
Total Regulatory Assets	$4,242	$4,370	$3,900	$3,987
Regulatory liabilities
Future income tax	$2,448	$2,515	$2,302	$2,363
Allowance for cost of removal less salvage	952	928	808	790
TCJA net benefits*	462	434	444	411
Net unbilled revenue deferrals	145	117	145	117
Energy efficiency portfolio standard unencumbered funds	123	127	119	122
Pension and other postretirement benefit deferrals	67	62	41	40
Property tax refunds	45	45	45	45
Net proceeds from sale of property	44	6	44	6
System benefit charge carrying charge	43	27	38	24
Earnings sharing - electric, gas and steam	26	36	19	27
BQDM and REV Demo reconciliations	25	18	24	18
Settlement of prudence proceeding	15	37	15	37
Settlement of gas proceedings	11	15	11	15
Unrecognized other postretirement costs	5	7	—	7
Carrying charges on repair allowance and bonus depreciation	4	21	4	21
New York State income tax rate change	3	17	3	17
Base rate change deferrals	1	10	1	10
Property tax reconciliation	—	36	—	36
Other	171	183	137	152
Regulatory liabilities – noncurrent	4,590	4,641	4,200	4,258
Refundable energy costs	36	31	8	8
Deferred derivative gains	33	30	32	29
Revenue decoupling mechanism	24	53	16	36
Regulatory liabilities – current	93	114	56	73
Total Regulatory Liabilities	$4,683	$4,755	$4,256	$4,331

* See "Other Regulatory Matters," above.

Capitalization

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Capitalization

In February 2019, Con Edison borrowed $825 million under a two-year variable-rate term loan to fund the repayment of a six-month variable-rate term loan. In June 2019, Con Edison pre-paid $150 million of the amount borrowed.

In March 2019, Con Edison issued 5,649,369 shares of its common stock for $425 million upon physical settlement of the remaining shares subject to its November 2018 forward sale agreements.

In April 2019, CECONY redeemed at maturity $475 million of 6.65 percent 10-year debentures.

In May 2019, Con Edison entered into a forward sale agreement relating to 5,800,000 shares of its common stock. In June 2019, the company issued 4,750,000 shares for $400 million upon physical settlement of shares subject to the forward sale agreement. At September 30, 2019, 1,050,000 shares remain subject to the forward sale agreement. The company expects the remaining shares under the forward sale agreement to settle by December 28, 2020. The company or the forward purchaser may accelerate the forward sale agreement upon the occurrence of certain events. On a settlement date, if the company decides to physically settle, it will issue shares to the forward purchaser at the then-applicable forward sale price. The forward sale price is equal to $84.83 per share subject to adjustment on a daily basis based on a floating interest rate factor less a spread and will be subject to decrease by amounts related to expected dividends. The remaining shares under the forward sale agreement will be physically settled, unless the company elects cash or net share settlement (which it has the right to do, subject to certain conditions, other than in limited circumstances). In the event the company elects to cash settle or net share settle, the settlement amount will be generally related to (1)(a) the market value of the common stock during the unwind period under the forward sale agreement minus (b) the applicable forward sale price; multiplied by (2) the number of shares subject to such cash settlement or net share settlement. If this settlement amount is a negative number, the forward purchaser will pay the company the absolute value of that amount or deliver to the company a number of shares having a value equal to the absolute value of such amount. If this settlement amount is a positive number, the company will pay the forward purchaser that amount or deliver to the forward purchaser a number of shares having a value equal to such amount.

In May 2019, CECONY issued $700 million aggregate principal amount of 4.125 percent debentures, due 2049.

In May 2019, O&R’s New Jersey utility subsidiary paid the remaining $1 million principal amount of Transition Bonds issued in 2004.

In May 2019, a Con Edison Development subsidiary borrowed $464 million at a variable-rate, due 2026, secured by equity interests in solar electric production projects. The company has entered into fixed-rate interest rate swaps in connection with this borrowing. See Note L.

In September 2019, O&R agreed to issue in November 2019 $43 million aggregate principal amount of 3.73 percent debentures, due 2049 and to issue in December 2019 $44 million aggregate principal amount of 2.94 percent debentures, due 2029 and $38 million aggregate principal amount of 3.46 percent debentures, due 2039.

In October 2019, a Con Edison Development subsidiary issued $303 million aggregate principal amount of 3.82 percent senior notes, due 2038, secured by the company's Panoche Valley and Wistaria Solar renewable electric production projects.

The carrying amounts and fair values of long-term debt at September 30, 2019 and December 31, 2018 were:



(Millions of Dollars)	2019		2018
Long-Term Debt (including current portion) (a)	Carrying Amount	Fair Value	Carrying Amount	Fair Value
Con Edison	$19,451	$22,412	$18,145	$18,740
CECONY	$14,374	$17,047	$14,151	$14,685


(a)	Amounts shown are net of unamortized debt expense and unamortized debt discount of $167 million and $141 million for Con Edison and CECONY, respectively, as of September 30, 2019 and $185 million and $139 million for Con Edison and CECONY, respectively, as of December 31, 2018.

The fair values of the Companies' long-term debt have been estimated primarily using available market information and at September 30, 2019 are classified as Level 2 (see Note M).

At December 31, 2018, the Clean Energy Businesses had $2,076 million of non-recourse project debt secured by the pledge of the applicable renewable energy production projects, of which $1,965 million was included in long-term debt and $111 million was included in long-term debt due within one year in Con Edison's consolidated balance sheet. As a result of the January 2019 PG&E bankruptcy (see "Long-Lived and Intangible Assets" in Note A), during the first quarter of 2019, Con Edison reclassified on its consolidated balance sheet the PG&E-related project debt that was included in long-term debt to long-term debt due within one year. At September 30, 2019, long-term debt due within one year included $1,012 million of PG&E-related project debt. The lenders for the PG&E-related project debt may, upon written notice, declare principal and interest on the PG&E-related project debt to be due and payable immediately and, if such amounts are not timely paid, foreclose on the related projects. The company is seeking to negotiate agreements with the PG&E-related project debt lenders pursuant to which the lenders would defer exercising these remedies.

Environmental Matters

9 Months Ended

Sep. 30, 2019

Environmental Remediation Obligations [Abstract]

Environmental Matters

Superfund Sites

Hazardous substances, such as asbestos, polychlorinated biphenyls (PCBs) and coal tar, have been used or generated in the course of operations of the Utilities and their predecessors and are present at sites and in facilities and equipment they currently or previously owned, including sites at which gas was manufactured or stored.

The Federal Comprehensive Environmental Response, Compensation and Liability Act of 1980 and similar state statutes (Superfund) impose joint and several liability, regardless of fault, upon generators of hazardous substances for investigation and remediation costs (which include costs of demolition, removal, disposal, storage, replacement, containment and monitoring) and natural resource damages. Liability under these laws can be material and may be imposed for contamination from past acts, even though such past acts may have been lawful at the time they occurred. The sites at which the Utilities have been asserted to have liability under these laws, including their manufactured gas plant sites and any neighboring areas to which contamination may have migrated, are referred to herein as “Superfund Sites.”

For Superfund Sites where there are other potentially responsible parties and the Utilities are not managing the site investigation and remediation, the accrued liability represents an estimate of the amount the Utilities will need to pay to investigate and, where determinable, discharge their related obligations. For Superfund Sites (including the manufactured gas plant sites) for which one of the Utilities is managing the investigation and remediation, the accrued liability represents an estimate of the company’s share of the undiscounted cost to investigate the sites and, for sites that have been investigated in whole or in part, the cost to remediate the sites, if remediation is necessary and if a reasonable estimate of such cost can be made. Remediation costs are estimated in light of the information available, applicable remediation standards and experience with similar sites.

The accrued liabilities and regulatory assets related to Superfund Sites at September 30, 2019 and December 31, 2018 were as follows:



	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Accrued Liabilities:
Manufactured gas plant sites	$679	$689	$596	$603
Other Superfund Sites	88	90	88	90
Total	$767	$779	$684	$693
Regulatory assets	$774	$810	$685	$716

Most of the accrued Superfund Site liability relates to sites that have been investigated, in whole or in part. However, for some of the sites, the extent and associated cost of the required remediation has not yet been

determined. As investigations progress and information pertaining to the required remediation becomes available, the Utilities expect that additional liability may be accrued, the amount of which is not presently determinable but may be material. The Utilities are permitted to recover or defer as regulatory assets (for subsequent recovery through rates) prudently incurred site investigation and remediation costs.

Environmental remediation costs incurred related to Superfund Sites for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Remediation costs incurred	$4	$8	$2	$5



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Remediation costs incurred	$15	$17	$10	$14

Insurance and other third-party recoveries received by Con Edison or CECONY were immaterial for the three and nine months ended September 30, 2019 and 2018.

In 2018, Con Edison and CECONY estimated that for their manufactured gas plant sites (including CECONY’s Astoria site), the aggregate undiscounted potential liability for the investigation and remediation of coal tar and/or other environmental contaminants could range up to $2.8 billion and $2.6 billion, respectively. These estimates were based on the assumption that there is contamination at all sites, including those that have not yet been fully investigated and additional assumptions about the extent of the contamination and the type and extent of the remediation that may be required. Actual experience may be materially different.

Asbestos Proceedings

Suits have been brought in New York State and federal courts against the Utilities and many other defendants, wherein a large number of plaintiffs sought large amounts of compensatory and punitive damages for deaths and injuries allegedly caused by exposure to asbestos at various premises of the Utilities. The suits that have been resolved, which are many, have been resolved without any payment by the Utilities, or for amounts that were not, in the aggregate, material to them. The amounts specified in all the remaining thousands of suits total billions of dollars; however, the Utilities believe that these amounts are greatly exaggerated, based on the disposition of previous claims. At September 30, 2019, Con Edison and CECONY have accrued their estimated aggregate undiscounted potential liabilities for these suits and additional suits that may be brought over the next 15 years as shown in the following table. These estimates were based upon a combination of modeling, historical data analysis and risk factor assessment. Courts have begun, and unless otherwise determined on appeal may continue, to apply different standards for determining liability in asbestos suits than the standard that applied historically. As a result, the Companies currently believe that there is a reasonable possibility of an exposure to loss in excess of the liability accrued for the suits. The Companies are unable to estimate the amount or range of such loss. In addition, certain current and former employees have claimed or are claiming workers’ compensation benefits based on alleged disability from exposure to asbestos. CECONY is permitted to defer as regulatory assets (for subsequent recovery through rates) costs incurred for its asbestos lawsuits and workers’ compensation claims.

The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets for the Companies at September 30, 2019 and December 31, 2018 were as follows:



	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Accrued liability – asbestos suits	$8	$8	$7	$7
Regulatory assets – asbestos suits	$8	$8	$7	$7
Accrued liability – workers’ compensation	$79	$79	$75	$75
Regulatory assets – workers’ compensation	$5	$5	$5	$5

Other Material Contingencies

9 Months Ended

Sep. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Other Material Contingencies

Manhattan Explosion and Fire

On March 12, 2014, two multi-use five-story tall buildings located on Park Avenue between 116^th and 117^th 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 the company, 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 the company 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, which caused it to sag and overstressed the defective fusion joint. The NTSB also made safety recommendations, including recommendations to the company 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 the company related to the NYSPSC's investigations of the incident and the practices of qualifying persons to perform plastic fusions. Pursuant to the agreement, the company is providing $27 million of future benefits to customers (for which it has accrued a regulatory liability) and will not recover from customers $126 million of costs for gas emergency response activities that it had previously incurred and expensed. Approximately eighty suits are pending against the company seeking generally unspecified damages and, in some cases, punitive damages, for wrongful death, personal injury, property damage and business interruption. The company has notified its insurers of the incident and believes that the policies in force at the time of the incident will cover the company’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. The company is unable to estimate the amount or range of its possible loss for damages related to the incident. At September 30, 2019, the company had not accrued a liability for damages related to the incident.

Manhattan Steam Main Rupture

In July 2018, a CECONY steam main located on Fifth Avenue and 21^st Street in Manhattan ruptured. Debris from the incident included dirt and mud containing asbestos. The response to the incident required the closing of buildings and streets for various periods. The NYSPSC has commenced an investigation. As of September 30, 2019, with respect to the incident, the company incurred estimated operating costs of $16 million for property damage, clean- up and other response costs and invested $10 million in capital and retirement costs. The company has notified its insurers of the incident and believes that the policies currently in force will cover the company’s costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have for damages to others in connection with the incident. The company is unable to estimate the amount or range of its possible loss related to the incident. At September 30, 2019, the company had not accrued a liability related to the incident.

Other Contingencies

For information about the PG&E bankruptcy, see "Long-Lived and Intangible Assets" in Note A and Note C. Also, for additional contingencies, see "Other Regulatory Matters" in Note B and “Uncertain Tax Positions” in Note J.

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. Maximum amounts guaranteed by Con Edison under these agreements totaled $1,954 million and $2,439 million at September 30, 2019 and December 31, 2018, respectively.

A summary, by type and term, of Con Edison’s total guarantees under these agreements at September 30, 2019 is as follows:



Guarantee Type	0 – 3 years	4 – 10 years	> 10 years		Total
	(Millions of Dollars)
Con Edison Transmission	$162	$411		$—	$573
Energy transactions	501	29	194		724
Renewable electric production projects	124	9	454		587
Other	70	—	—		70
Total	$857	$449	$648		$1,954

Con Edison Transmission — Con Edison has guaranteed payment by CET Electric of the contributions CET Electric agreed to make to New York Transco LLC (NY Transco). CET Electric owns a 45.7 percent interest in NY Transco. In April 2019, the New York Independent System Operator (NYISO) selected a transmission project that was jointly proposed by National Grid and NY Transco. The siting, construction and operation of the project will require approvals and permits from appropriate governmental agencies and authorities, including the NYSPSC. The NYISO indicated it will work with the developers to enter into agreements for the development and operation of the projects, including a schedule for entry into service by December 2023. Guarantee amount shown includes the maximum possible required amount of CET Electric’s contributions for this project as calculated based on the assumptions that the project is completed at 175 percent of its estimated costs and NY Transco does not use any debt financing for the project. Also included within the table above are guarantees for $25 million from Con Edison on behalf of CET Gas in relation to Mountain Valley Pipeline (MVP), LLC, a company developing a proposed gas transmission project in West Virginia and Virginia.

Energy Transactions — Con Edison guarantees payments on behalf of the Clean Energy Businesses in order to facilitate physical and financial transactions in electricity, gas, pipeline capacity, transportation, oil, renewable energy credits and energy services. To the extent that liabilities exist under the contracts subject to these guarantees, such liabilities are included in Con Edison’s consolidated balance sheet.

Renewable Electric Production Projects — Con Edison, Con Edison Development, and Con Edison Solutions guarantee payments on behalf of their wholly-owned subsidiaries associated with their investment in, or development for others of, solar and wind energy facilities.

Other — Other guarantees include $70 million in guarantees provided by Con Edison to Travelers Insurance Company for indemnity agreements for surety bonds in connection with operation of solar energy facilities and energy service projects of Con Edison Development and Con Edison Solutions, respectively.

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

In January 2019, the Companies adopted Accounting Standards Update (ASU) No. 2016-02, “Leases (Topic 842),” including the amendments thereto, using a modified retrospective transition method of adoption that required no prior period adjustments or charges to retained earnings for cumulative impact. The standard supersedes the lease requirements within ASC Topic 840, “Leases.”

The Companies lease land, office buildings, equipment and access rights to support electric transmission facilities. Upon adoption of Topic 842, the Companies recognized 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 are included in operating lease right-of-use asset and operating lease liabilities on the Companies’ consolidated balance sheets. 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. Lessor accounting is similar to the previous model, but updated to align with ASC Topic 606 “Revenue from Contracts with Customers."

The Companies elected the following practical expedients: (1) a package of practical expedients that allows the Companies to not reassess: (a) whether expired or existing contracts contained leases; (b) the lease classification

for expired or existing leases and (c) the initial direct costs for existing leases; (2) for all underlying asset classes, an expedient that allows the Companies to not apply the recognition requirements to short-term leases and an expedient that allows the Companies to account for lease and associated non-lease components as a single lease component; (3) an expedient that allows the use of hindsight to determine lease term; and (4) an expedient that allows the Companies to not evaluate under Topic 842 land easements that exist or expired before the entity’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840.

The Companies, upon adoption of Topic 842 recognized, and for new operating leases at commencement date 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. 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 35 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 may 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.

Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and nine months ended September 30, 2019 were as follows:

As of September 30, 2019, assets recorded as finance leases for Con Edison and CECONY were $2 million and $1 million, respectively, and the accumulated amortization associated with finance leases for Con Edison and CECONY were $5 million and $3 million, respectively. For the three and nine months ended September 30, 2019, 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 $2 million and $1 million, respectively, for the three months ended September 30, 2019 and $3 million and $2 million, respectively, for the nine months ended September 30, 2019.

Other information related to leases for Con Edison and CECONY at September 30, 2019 was as follows:



	Con Edison	CECONY
Weighted Average Remaining Lease Term:
Operating leases	18.9 years	14.3 years
Finance leases	11.2 years	2.3 years
Weighted Average Discount Rate:
Operating leases	4.3%	3.6%
Finance leases	3.8%	4.7%

Future minimum lease payments under non-cancellable leases at September 30, 2019 were as follows:



(Millions of Dollars)	Con Edison			CECONY
Year Ending September 30,	Operating Leases	Finance Leases		Operating Leases	Finance Leases
2020	$74	$1		$58	$1
2021	73	—		57	—
2022	69	—		53	—
2023	69	—		53	—
2024	69	—		53	—
All years thereafter	966	1		550	—
Total future minimum lease payments	$1,320	$2		$824	$1
Less: imputed interest	(442)	—		(180)	—
Total	$878	$2		$644	$1
Reported as of September 30, 2019
Operating lease liabilities (current)	$59		$—	$49		$—
Operating lease liabilities (noncurrent)	819	—		595	—
Other current liabilities	—	1		—	1
Other noncurrent liabilities	—	1		—	—
Total	$878	$2		$644	$1

At September 30, 2019, the Companies do not have material obligations under operating or finance leases that have not yet commenced.

Disclosures related to the three and nine months ended September 30, 2019 are presented as required under Topic 842. Prior period disclosures for the year ended December 31, 2018 are presented under Topic 840. The Companies have elected to use a practical expedient provided by Topic 842 whereby comparative disclosures for prior periods are allowed to be presented under Topic 840. Prior period disclosures under Topic 840 have been provided on an annual basis. As a result, the disclosures presented under Topic 842 and Topic 840 will not be fully comparable in specific disclosure requirements or time period.

The future minimum lease commitments at December 31, 2018, accounted for under Topic 840, for the Companies’ operating lease agreements that are not cancellable by the Companies were as follows:



(Millions of Dollars)	Con Edison	CECONY
2019	$72	$56
2020	72	56
2021	71	54
2022	68	53
2023	68	53
All years thereafter	890	592
Total	$1,241	$864

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 three and nine months ended September 30, 2019.

Leases

Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and nine months ended September 30, 2019 were as follows:

Other information related to leases for Con Edison and CECONY at September 30, 2019 was as follows:



	Con Edison	CECONY
Weighted Average Remaining Lease Term:
Operating leases	18.9 years	14.3 years
Finance leases	11.2 years	2.3 years
Weighted Average Discount Rate:
Operating leases	4.3%	3.6%
Finance leases	3.8%	4.7%

Future minimum lease payments under non-cancellable leases at September 30, 2019 were as follows:



(Millions of Dollars)	Con Edison			CECONY
Year Ending September 30,	Operating Leases	Finance Leases		Operating Leases	Finance Leases
2020	$74	$1		$58	$1
2021	73	—		57	—
2022	69	—		53	—
2023	69	—		53	—
2024	69	—		53	—
All years thereafter	966	1		550	—
Total future minimum lease payments	$1,320	$2		$824	$1
Less: imputed interest	(442)	—		(180)	—
Total	$878	$2		$644	$1
Reported as of September 30, 2019
Operating lease liabilities (current)	$59		$—	$49		$—
Operating lease liabilities (noncurrent)	819	—		595	—
Other current liabilities	—	1		—	1
Other noncurrent liabilities	—	1		—	—
Total	$878	$2		$644	$1

At September 30, 2019, the Companies do not have material obligations under operating or finance leases that have not yet commenced.

The future minimum lease commitments at December 31, 2018, accounted for under Topic 840, for the Companies’ operating lease agreements that are not cancellable by the Companies were as follows:



(Millions of Dollars)	Con Edison	CECONY
2019	$72	$56
2020	72	56
2021	71	54
2022	68	53
2023	68	53
All years thereafter	890	592
Total	$1,241	$864

Income Tax

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Tax

Con Edison’s income tax expense decreased to $116 million for the three months ended September 30, 2019 from $175 million for the three months ended September 30, 2018. The decrease in income tax expense is primarily due to lower income before income tax expense (excluding income attributable to noncontrolling interest (see Note N)), lower state income taxes, the absence of a $42 million re-measurement of deferred tax assets due to the TCJA associated with Con Edison’s 2017 federal net operating loss carryforward into 2018 recognized at the filing of its 2017 federal tax return, an increase in the amortization of excess deferred federal income taxes due to the TCJA and higher renewable energy credits and adjustments for prior period federal income tax returns primarily due to increased research and development credits at the Clean Energy Businesses, offset, in part, by an increase in uncertain tax positions at the Clean Energy Businesses.

CECONY’s income tax expense decreased to $119 million for the three months ended September 30, 2019 from $125 million for the three months ended September 30, 2018. The decrease in income tax expense is primarily due to lower income before income tax expense, lower state income taxes and an increase in the amortization of excess deferred federal income taxes due to the TCJA, offset, in part, by lower tax benefits in 2019 for plant-related flow through items and adjustments for the 2017 federal income tax return primarily due to increased non-deductible business expenses.

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 for the three months ended September 30, 2019 and 2018 is as follows:



	Con Edison				CECONY
(% of Pre-tax income)	2019		2018		2019		2018
STATUTORY TAX RATE
Federal	21	%	21	%	21	%	21	%
Changes in computed taxes resulting from:
State income tax	4		5		5		5
Other plant-related items	—		(1	)	—		(1	)
Renewable energy credits	(1	)	(1	)	—		—
TCJA deferred tax re-measurement	—		7		—		—
Reserve for uncertain tax positions	1		—		—		—
Amortization of excess deferred federal income taxes	(3	)	(2	)	(3	)	(2	)
Prior period return adjustments	(2	)	—		—		—
Other	—		(1	)	(1	)	(1	)
Effective tax rate	20	%	28	%	22	%	22	%

Con Edison’s income tax expense decreased to $243 million for the nine months ended September 30, 2019 from $330 million for the nine months ended September 30, 2018. The decrease in income tax expense is primarily due to lower income before income tax expense (excluding income attributable to noncontrolling interest (see Note N)), lower state income taxes, the absence of a $42 million re-measurement of deferred tax assets due to the TCJA associated with Con Edison’s 2017 federal net operating loss carryforward into 2018 recognized at the filing of its 2017 federal tax return, an increase in the amortization of excess deferred federal income taxes due to the TCJA, higher renewable energy credits and adjustments for prior period federal income tax returns primarily due to increased research and development credits at the Clean Energy Businesses, offset, in part, by an increase in uncertain tax positions at the Clean Energy Businesses.

CECONY’s income tax expense decreased to $271 million for the nine months ended September 30, 2019 from $274 million for the nine months ended September 30, 2018. The decrease in income tax expense is primarily due to lower state income taxes and an increase in the amortization of excess deferred federal income taxes due to the TCJA, offset, in part, by higher income before income tax expense and lower tax benefits in 2019 for plant-related flow through items and adjustments for the 2017 federal income tax returns primarily due to increased non-deductible business expenses.

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 for the nine months ended September 30, 2019 and 2018 is as follows:



	Con Edison				CECONY
(% of Pre-tax income)	2019		2018		2019		2018
STATUTORY TAX RATE
Federal	21	%	21	%	21	%	21	%
Changes in computed taxes resulting from:
State income tax	4		5		5		5
Cost of removal	1		1		1		1
Other plant-related items	—		(1	)	(1	)	(1	)
Renewable energy credits	(2	)	(1	)	—		—
TCJA deferred tax re-measurement	—		3		—		—
Amortization of excess deferred federal income taxes	(4	)	(3	)	(3	)	(3	)
Other	(1	)	(1	)	(1	)	(1	)
Effective tax rate	19	%	24	%	22	%	22	%

CECONY and O&R deferred as regulatory liabilities their estimated net benefits under the TCJA for the nine months ended September 30, 2018. CECONY's net benefits prior to January 1, 2019 for its electric service and amortization of excess deferred federal income taxes for its electric service for the nine months ended September 30, 2019 continue to be deferred. RECO deferred as a regulatory liability its estimated net benefits under the TCJA for the three months ended March 31, 2018. The net benefits include the revenue requirement impact of the reduction in the corporate federal income tax rate to 21 percent, the elimination for utilities of bonus depreciation and the amortization of excess deferred federal income taxes the utilities collected from customers that will not need to be paid to the Internal Revenue Service under the TCJA. See “Other Regulatory Matters” in Note B.

Uncertain Tax Positions

At September 30, 2019, the estimated liability for uncertain tax positions for Con Edison was $15 million ($4 million for CECONY). Con Edison reasonably expects to resolve within the next twelve months approximately $12 million of various federal and state uncertainties due to the expected completion of ongoing tax examinations, of which the entire amount, if recognized, would reduce Con Edison's effective tax rate. The amount related to CECONY is approximately $3 million, which, if recognized, would reduce CECONY’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $15 million ($14 million, net of federal taxes).

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 the three and nine months ended September 30, 2019, the Companies recognized an immaterial amount of interest expense and penalties for uncertain tax positions in their consolidated income statements. At September 30, 2019 and December 31, 2018, the Companies recognized an immaterial amount of accrued interest on their consolidated balance sheets.

Financial Information by Business Segment

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Financial Information by Business Segment

Con Edison’s principal business segments are CECONY’s regulated utility activities, O&R’s regulated utility activities, the Clean Energy Businesses and Con Edison Transmission. CECONY’s principal business segments are its regulated electric, gas and steam utility activities. The financial data for the business segments for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Operating revenues		Inter-segment revenues				Depreciation and amortization		Operating income/(loss)
(Millions of Dollars)	2019	2018	2019		2018		2019	2018	2019	2018
CECONY
Electric	$2,544	$2,571	$4		$4		$266	$248	$803	$850
Gas	275	264	2		2		58	52	(24)	(34)
Steam	58	64	18		19		22	22	(56)	(52)
Consolidation adjustments	—	—	(24)		(25)		—	—	—	—
Total CECONY	$2,877	$2,899		$—		$—	$346	$322	$723	$764
O&R
Electric	$210	$212		$—		$—	$16	$14	$56	$52
Gas	31	34	—		—		6	5	(10)	(10)
Total O&R	$241	$246		$—		$—	$22	$19	$46	$42
Clean Energy Businesses	$247	$181		$—		$—	$53	$18	$100	$25
Con Edison Transmission	1	1	—		—		—	—	(1)	(2)
Other (a)	(1)	1	—		—		—	1	(1)	(3)
Total Con Edison	$3,365	$3,328		$—		$—	$421	$360	$867	$826

(a) Parent company and consolidation adjustments. Other does not represent a business segment.



	For the Nine Months Ended September 30,
	Operating revenues		Inter-segment revenues				Depreciation and amortization		Operating income/(loss)
(Millions of Dollars)	2019	2018	2019		2018		2019	2018	2019	2018
CECONY
Electric	$6,174	$6,107	$13		$12		$785	$732	$1,374	$1,421
Gas	1,605	1,540	6		6		168	152	414	369
Steam	469	474	52		56		67	65	37	60
Consolidation adjustments	—	—	(71)		(74)		—	—	—	—
Total CECONY	$8,248	$8,121		$—		$—	$1,020	$949	$1,825	$1,850
O&R
Electric	$493	$505		$—		$—	$46	$41	$88	$79
Gas	185	186	—		—		17	16	25	31
Total O&R	$678	$691		$—		$—	$63	$57	$113	$110
Clean Energy Businesses	696	573	—		—		169	55	183	59
Con Edison Transmission	3	3	—		—		1	1	(5)	(5)
Other (a)	(2)	—	—		—		—	(1)	(5)	(7)
Total Con Edison	$9,623	$9,388		$—		$—	$1,253	$1,061	$2,111	$2,007

(a) Parent company and consolidation adjustments. Other does not represent a business segment.

Derivative Instruments and Hedging Activities

9 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

The Utilities and the Clean Energy Businesses hedge market price fluctuations associated with physical purchases and sales of electricity, natural gas, steam and, to a lesser extent, refined fuels by using derivative instruments including futures, forwards, basis swaps, options, transmission congestion contracts and financial transmission rights contracts. These are economic hedges, for which the Utilities and the Clean Energy Business do not elect hedge accounting. The Clean Energy Businesses use interest rate swaps to manage the risks associated with interest rates related to outstanding and expected future debt issuances and borrowings. Derivatives are recognized on the consolidated balance sheet at fair value (see Note M), unless an exception is available under the accounting rules for derivatives and hedging. Qualifying derivative contracts that have been designated as normal purchases or normal sales contracts are not reported at fair value under the accounting rules.

In August 2017, the FASB issued amendments to the guidance for derivatives and hedging through ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” The amendments in this update provide greater clarification on hedge accounting for risk components, presentation and disclosure of hedging instruments, and overall targeted improvements to simplify hedge accounting. The amendments were effective for reporting periods beginning after December 15, 2018. The application of the guidance did not have a material impact on the Companies’ financial position, results of operations and liquidity because the Companies do not elect hedge accounting for their derivative instruments and hedging activities.

The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at September 30, 2019 and December 31, 2018 were:



(Millions of Dollars)	2019				2018
Balance Sheet Location	Gross Amounts of Recognized Assets/(Liabilities)	Gross Amounts Offset	Net Amounts of Assets/ (Liabilities) (a)		Gross Amounts of Recognized Assets/(Liabilities)	Gross Amounts Offset	Net Amounts of Assets/ (Liabilities) (a)
Con Edison
Fair value of derivative assets
Current	$51	$(8)	$43	(b)	$43	$(14)	$29	(b)
Noncurrent	7	(7)	—		16	(7)	9	(d)
Total fair value of derivative assets	$58	$(15)	$43		$59	$(21)	$38
Fair value of derivative liabilities
Current	$(89)	$17	$(72)	(c)	$(61)	$11	$(50)
Noncurrent	(156)	9	(147)	(c)	(25)	9	(16)	(d)
Total fair value of derivative liabilities	$(245)	$26	$(219)		$(86)	$20	$(66)
Net fair value derivative assets/(liabilities)	$(187)	$11	$(176)		$(27)	$(1)	$(28)
CECONY
Fair value of derivative assets
Current	$42	$(19)	$23	(b)	$25	$(6)	$19	(b)
Noncurrent	6	(6)	—		11	(5)	6
Total fair value of derivative assets	$48	$(25)	$23		$36	$(11)	$25
Fair value of derivative liabilities
Current	$(61)	$28	$(33)		$(31)	$6	$(25)
Noncurrent	(90)	8	(82)		(12)	6	(6)
Total fair value of derivative liabilities	$(151)	$36	$(115)		$(43)	$12	$(31)
Net fair value derivative assets/(liabilities)	$(103)	$11	$(92)		$(7)	$1	$(6)

(a)

Derivative instruments and collateral were offset on the consolidated balance sheet as applicable under the accounting rules. The Companies enter into master agreements for their commodity derivatives. These agreements typically provide offset in the event of contract termination. In such case, generally the non-defaulting party’s payable will be offset by the defaulting party’s payable. The non-defaulting party will customarily notify the defaulting party within a specific time period and come to an agreement on the early termination amount.

(b)

At September 30, 2019 and December 31, 2018, margin deposits for Con Edison ($7 million) and CECONY ($6 million) were classified as derivative assets on the consolidated balance sheet, but not included in the table. Margin is collateral, typically cash, that the holder of a derivative instrument is required to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange.


(c)	Includes amounts for interest rate swaps of $(7) million in current liabilities and $(57) million in noncurrent liabilities. At September 30, 2019, the Clean Energy Businesses had interest rate swaps with notional amounts of $934 million. The expiration dates of the swaps range from 2024-2041.


(d)	Includes amounts for interest rate swaps of $2 million in noncurrent assets and $(6) million in noncurrent liabilities. At December 31, 2018, the Clean Energy Business had interest rate swaps with notional amounts of $499 million. The expiration dates of the swaps range from 2024-2035.

The Utilities generally recover their prudently incurred fuel, purchased power and gas costs, including hedging gains and losses, in accordance with rate provisions approved by the applicable state utility regulators. In accordance with the accounting rules for regulated operations, the Utilities record a regulatory asset or liability to defer recognition of unrealized gains and losses on their electric and gas derivatives. As gains and losses are realized in future periods, they will be recognized as purchased power, gas and fuel costs in the Companies’ consolidated income statements.

The Clean Energy Businesses record realized and unrealized gains and losses on their derivative contracts in purchased power, gas purchased for resale and non-utility revenue in the reporting period in which they occur. The Clean Energy Businesses record changes in the fair value of their interest rate swaps in other interest expense at the end of each reporting period. Management believes that these derivative instruments represent economic hedges that mitigate exposure to fluctuations in commodity prices and interest rates.

The following table presents the realized and unrealized gains or losses on derivatives that have been deferred or recognized in earnings for the three and nine months ended September 30, 2019 and 2018:



		For the Three Months Ended September 30,
		Con Edison			CECONY
(Millions of Dollars)	Balance Sheet Location	2019	2018		2019		2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$15	$6		$15		$6
Noncurrent	Deferred derivative gains	—	—		—		2
Total deferred gains/(losses)		$15	$6		$15		$8
Current	Deferred derivative losses	$6	$25		$6		$25
Current	Recoverable energy costs	(35)	(4)		(32)		(6)
Noncurrent	Deferred derivative losses	18	15		16		14
Total deferred gains/(losses)		$(11)	$36		$(10)		$33
Net deferred gains/(losses)		$4	$42		$5		$41
	Income Statement Location
Pre-tax gains/(losses) recognized in income
	Gas purchased for resale	$1		$—		$—		$—
	Non-utility revenue	5	(7)		—		—
	Other operations and maintenance expense	(1)	—		(1)
	Other interest expense	(26)	—		—		—
Total pre-tax gains/(losses) recognized in income		$(21)	$(7)		$(1)			$—



		For the Nine Months Ended September 30,
		Con Edison		CECONY
(Millions of Dollars)	Balance Sheet Location	2019	2018	2019		2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$3	$(11)	$3		$(10)
Noncurrent	Deferred derivative gains	(8)	5	(5)		4
Total deferred gains/(losses)		$(5)	$(6)	$(2)		$(6)
Current	Deferred derivative losses	$(32)	$21	$(28)		$23
Current	Recoverable energy costs	(94)	(13)	(82)		(14)
Noncurrent	Deferred derivative losses	(82)	23	(79)		21
Total deferred gains/(losses)		$(208)	$31	$(189)		$30
Net deferred gains/(losses)		$(213)	$25	$(191)		$24
	Income Statement Location
Pre-tax gains/(losses) recognized in income
	Gas purchased for resale	$(2)	$(1)		$—		$—
	Non-utility revenue	20	(7)	—		—
	Other interest expense	(60)	—	—		—
Total pre-tax gains/(losses) recognized in income		$(42)	$(8)		$—		$—

The following table presents the hedged volume of Con Edison’s and CECONY’s commodity derivative transactions at September 30, 2019:



	Electric Energy (MWh) (a)(b)	Capacity (MW) (a)	Natural Gas (Dt) (a)(b)	Refined Fuels (gallons)
Con Edison	27,843,993	25,054	277,395,718	6,720,000
CECONY	25,361,275	16,800	260,350,000	6,720,000


(a)	Volumes are reported net of long and short positions, except natural gas collars where the volumes of long positions are reported.


(b)	Excludes electric congestion and gas basis swap contracts, which are associated with electric and gas contracts and hedged volumes.

The Companies are exposed to credit risk related to transactions entered into primarily for the various energy supply and hedging activities by the Utilities and the Clean Energy Businesses. Credit risk relates to the loss that may result from a counterparty’s nonperformance. The Companies use credit policies to manage this risk, including an established credit approval process, monitoring of counterparty limits, netting provisions within agreements, collateral or prepayment arrangements, credit insurance and credit default swaps. The Companies measure credit risk exposure as the replacement cost for open energy commodity and derivative positions plus amounts owed from counterparties for settled transactions. The replacement cost of open positions represents unrealized gains, net of any unrealized losses where the Companies have a legally enforceable right to offset.

At September 30, 2019, Con Edison and CECONY had $154 million and $6 million of credit exposure in connection with open energy supply net receivables and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $58 million with independent system operators, $50 million with non-investment grade/non-rated counterparties, $35 million with investment-grade counterparties and $11 million with commodity exchange brokers. CECONY’s net credit exposure consisted of $6 million with commodity exchange brokers and an immaterial amount with investment-grade counterparties.

The collateral requirements associated with, and settlement of, derivative transactions are included in net cash flows from operating activities in the Companies’ consolidated statement of cash flows. Most derivative instrument contracts contain provisions that may require a party to provide collateral on its derivative instruments that are in a net liability position. The amount of collateral to be provided will depend on the fair value of the derivative instruments and the party’s credit ratings.

The following table presents the aggregate fair value of the Companies’ derivative instruments with credit-risk-related contingent features that are in a net liability position, the collateral posted for such positions and the additional collateral that would have been required to be posted had the lowest applicable credit rating been reduced one level and to below investment grade at September 30, 2019:



(Millions of Dollars)	Con Edison (a)		CECONY (a)
Aggregate fair value – net liabilities	$112		$95
Collateral posted	26		20
Additional collateral (b) (downgrade one level from current ratings)	18		14
Additional collateral (b) (downgrade to below investment grade from current ratings)	123	(c)	92	(c)

(a)

Non-derivative transactions for the purchase and sale of electricity and gas and qualifying derivative instruments, which have been designated as normal purchases or normal sales, are excluded from the table. These transactions primarily include purchases of electricity from independent system operators. In the event the Utilities and the Clean Energy Businesses were no longer extended unsecured credit for such purchases, the Companies would be required to post an immaterial amount of additional collateral at September 30, 2019. For certain other such non-derivative transactions, the Companies could be required to post collateral under certain circumstances, including in the event counterparties had reasonable grounds for insecurity.

(b)

The Companies measure the collateral requirements by taking into consideration the fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position plus amounts owed to counterparties for settled transactions and amounts required by counterparties for minimum financial security. The fair value amounts represent unrealized losses, net of any unrealized gains where the Companies have a legally enforceable right to offset.

(c)

Derivative instruments that are net assets have been excluded from the table. At September 30, 2019, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $26 million.

Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

The accounting rules for fair value measurements and disclosures define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or

liabilities. These inputs can be readily observable, market corroborated, or generally unobservable firm inputs. The Companies often make certain assumptions that market participants would use in pricing the asset or liability, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. The Companies use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs.

The accounting rules for fair value measurements and disclosures established a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The rules require that assets and liabilities be classified in their entirety based on the level of input that is significant to the fair value measurement. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability, and may affect the valuation of the asset or liability and their placement within the fair value hierarchy. The Companies classify fair value balances based on the fair value hierarchy defined by the accounting rules for fair value measurements and disclosures as follows:

•

Level 1 – Consists of assets or liabilities whose value is based on unadjusted quoted prices in active markets at the measurement date. An active market is one in which transactions for assets or liabilities occur with sufficient frequency and volume to provide pricing information on an ongoing basis. This category includes contracts traded on active exchange markets valued using unadjusted prices quoted directly from the exchange.

•

Level 2 – Consists of assets or liabilities valued using industry standard models and based on prices, other than quoted prices within Level 1, that are either directly or indirectly observable as of the measurement date. The industry standard models consider observable assumptions including time value, volatility factors and current market and contractual prices for the underlying commodities, in addition to other economic measures. This category includes contracts traded on active exchanges or in over-the-counter markets priced with industry standard models.

•

Level 3 – Consists of assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost benefit constraints. This category includes contracts priced using models that are internally developed and contracts placed in illiquid markets. It also includes contracts that expire after the period of time for which quoted prices are available and internal models are used to determine a significant portion of the value.

Assets and liabilities measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018 are summarized below.



	2019						2018
(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)	$4	$33	$2	$11		$50	$6	$36	$7	$(6)	$43
Interest rate swaps (a)(b)(c)	—	—	—	—		—	—	2	—	—	2
Other (a)(b)(d)	330	123	—	—		453	287	114	—	—	401
Total assets	$334	$156	$2	$11		$503	$293	$152	$7	$(6)	$446
Derivative liabilities:
Commodity (a)(b)(c)	$18	$98	$46	$(7)		$155	$8	$43	$20	$(11)	$60
Interest rate swaps (a)(b)(c)	—	64	—	—		64	—	6	—	—	6
Total liabilities	$18	$162	$46	$(7)		$219	$8	$49	$20	$(11)	$66
CECONY
Derivative assets:
Commodity (a)(b)(c)	$3	$25	$1		$—	$29	$3	$28	$1	$(1)	$31
Other (a)(b)(d)	310	117	—	—		427	267	109	—	—	376
Total assets	$313	$142	$1		$—	$456	$270	$137	$1	$(1)	$407
Derivative liabilities:
Commodity (a)(b)(c)	$15	$87	$32	$(19)		$115	$5	$30	$3	$(6)	$32


(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 no transfers between levels 1, 2, and 3 during the nine months ended September 30, 2019.

Con Edison and CECONY had $2 million of commodity derivative liabilities transferred from level 3 to level 2 during the year ended December 31, 2018 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, 2018 to less than three years as of December 31, 2018.

(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, 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 September 30, 2019 and December 31, 2018, the Companies determined that nonperformance risk would have no material impact on their financial position or results of operations.


(d)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.


(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.

The employees in the Companies’ risk management group develop and maintain the Companies’ valuation policies and procedures for, and verify pricing and fair value valuation of, commodity derivatives and interest rate swaps. Under the Companies’ policies and procedures, multiple independent sources of information are obtained for forward price curves used to value commodity derivatives and interest rate swaps. Fair value and changes in fair value of commodity derivatives and interest rate swaps are reported on a monthly basis to the Companies’ risk committees, comprised of officers and employees of the Companies that oversee energy hedging at the Utilities and the Clean Energy Businesses. The risk management group reports to the Companies’ Vice President and Treasurer.



	Fair Value of Level 3 at September 30, 2019	Valuation Techniques	Unobservable Inputs	Range
	(Millions of Dollars)	Valuation Techniques	Unobservable Inputs	Range
Con Edison – Commodity
Electricity	$(26)	Discounted Cash Flow	Forward energy prices (a)	$16.20-$71.77 per MWh
	(18)	Discounted Cash Flow	Forward capacity prices (a)	$0.45-$7.75 per kW-month
Natural Gas	(1)	Discounted Cash Flow	Forward natural gas prices (a)	$0.97-$2.43 per Dt
Transmission Congestion Contracts/Financial Transmission Rights	1	Discounted Cash Flow	Inter-zonal forward price curves adjusted for historical zonal losses (b)	$(1.00)-$7.03 per MWh
Total Con Edison—Commodity	$(44)
CECONY – Commodity
Electricity	$(24)	Discounted Cash Flow	Forward energy prices (a)	$23.40-$71.77 per MWh
	(8)	Discounted Cash Flow	Forward capacity prices (a)	$0.45-$7.75 per kW-month
Transmission Congestion Contracts	1	Discounted Cash Flow	Inter-zonal forward price curves adjusted for historical zonal losses (b)	$0.35-$4.11 per MWh
Total CECONY—Commodity	$(31)


(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.

The table listed below provides a reconciliation of the beginning and ending net balances for assets and liabilities measured at fair value as of September 30, 2019 and 2018 and classified as Level 3 in the fair value hierarchy:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance as of July 1,	$(46)	$(4)	$(30)		$—
Included in earnings	4	4	1	2
Included in regulatory assets and liabilities	(1)	(4)	(1)	—
Settlements	(1)	(6)	(1)	(2)
Ending balance as of September 30,	$(44)	$(10)	$(31)		$—



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance as of January 1,	$(13)	$1	$(2)	$4
Included in earnings	(2)	4	1	4
Included in regulatory assets and liabilities	(32)	(7)	(29)	(5)
Settlements	3	(9)	(1)	(4)
Transfer out of level 3	—	1	—	1
Ending balance as of September 30,	$(44)	$(10)	$(31)		$—

For the Utilities, realized gains and losses on Level 3 commodity derivative assets and liabilities are reported as part of purchased power, gas and fuel costs. The Utilities generally recover these costs in accordance with rate provisions approved by the applicable state public utilities regulators. Unrealized gains and losses for commodity derivatives are generally deferred on the consolidated balance sheet in accordance with the accounting rules for regulated operations.

For the Clean Energy Businesses, realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues ($3 million gain and $1 million loss) and purchased power costs (immaterial for both periods) on the consolidated income statement for the three months ended September 30, 2019 and 2018, respectively. Realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues ($2 million gain and $4 million loss) and purchased power costs (immaterial for both periods) on the consolidated income statement for the nine months ended September 30, 2019 and 2018, respectively. The change in fair value relating to Level 3 commodity derivative assets and liabilities held at September 30, 2019 and 2018 is included in non-utility revenues ($3 million gain and $1 million loss) and purchased power costs (immaterial for both periods) on the consolidated income statement for the three months ended September 30, 2019 and 2018, respectively. For the nine months ended September 30, 2019 and 2018, the change in fair value relating to Level 3 commodity derivatives assets and liabilities is included in non-utility revenues ($2 million gain and $5 million loss) and purchased power costs (immaterial for both periods), respectively, on the consolidated income statement.

Variable Interest Entities

9 Months Ended

Sep. 30, 2019

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 2018, 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. The payments for this contract constitute CECONY’s maximum exposure to loss with respect to the potential VIE.

Con Edison Development

In September 2019, Con Edison Development, which previously owned an 80 percent membership interest in OCI Solar San Antonio 4 LLC (Texas Solar 4), acquired the remaining 20 percent interest. Texas Solar 4 is a consolidated entity. Prior to the acquisition, Con Edison had a variable interest in Texas Solar 4, as to which Con Edison was the primary beneficiary since the power to direct the activities that most significantly impact the economics of Texas Solar 4 was held by a Con Edison Development subsidiary. Texas Solar 4 owns a project company that developed a 40 MW (AC) solar electric production project. Electricity generated by the project is sold

pursuant to a long-term power purchase agreement. Con Edison's losses from Texas Solar 4 for the three and nine months ended September 30, 2019 and 2018 were immaterial.

In December 2018, a Con Edison Development subsidiary 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. The Tax Equity Projects are consolidated entities in which Con Edison has less than a 100 percent membership interest. Con Edison is the primary beneficiary since the power to direct the activities that most significantly impact the economics of the Tax Equity Projects is held by Con Edison Development subsidiaries. Electricity generated by the Tax Equity Projects is sold to utilities and municipalities pursuant to long-term power purchase agreements. For the three months ended September 30, 2019, the hypothetical liquidation at book value (HLBV) method of accounting for the Tax Equity Projects resulted in $30 million of income ($23 million, after tax) for the tax equity investor and a $13 million loss ($10 million, after tax) for Con Edison. For the nine months ended September 30, 2019, the HLBV method of accounting for the Tax Equity Projects resulted in $79 million of income ($60 million, after-tax) for the tax equity investor and a $47 million loss ($36 million, after-tax) for Con Edison.

At September 30, 2019 and December 31, 2018, Con Edison’s consolidated balance sheet included the following amounts associated with its VIEs:



	Tax Equity Projects
	Great Valley Solar (c)(d)				Copper Mountain - Mesquite Solar (c)(e)				Texas Solar 4 (c)(f)
(Millions of Dollars)	2019		2018		2019		2018		2018
Restricted cash		$—		$—		$—		$—	$4
Non-utility property, less accumulated depreciation (g)(h)	295		313		465		492		98
Other assets	47		18		131		97		9
Total assets (a)	$342		$331		$596		$589		$111
Long-term debt due within one year		$—		$—		$—		$—	$2
Other liabilities	19		17		22		33		26
Long-term debt	—		—		—		—		56
Total liabilities (b)	$19		$17		$22		$33		$84


(a)	The assets of the Tax Equity Projects represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE.


(b)	The liabilities of the Tax Equity Projects represent liabilities of a consolidated VIE for which creditors do not have recourse to the general credit of the primary beneficiary.


(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 $57 million and $33 million at September 30, 2019 and December 31, 2018, respectively.


(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 $115 million and $71 million at September 30, 2019 and December 31, 2018, respectively.


(f)	Noncontrolling interest of the third party was $7 million at December 31, 2018.


(g)	Non-utility property is reduced by accumulated depreciation of $7 million for Great Valley Solar and $10 million for Copper Mountain - Mesquite Solar at September 30, 2019.

(h)

Non-utility property is reduced by accumulated depreciation of $1 million for Great Valley Solar, $1 million for Copper Mountain - Mesquite Solar and $15 million for Texas Solar 4 at December 31, 2018.

New Financial Accounting Standards	9 Months Ended
New Financial Accounting Standards	Sep. 30, 2019
Accounting Changes and Error Corrections [Abstract]
New Financial Accounting Standards	New Financial Accounting Standards In June 2016, the FASB issued amendments to the guidance for recognition of credit losses for financial instruments through ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments replace the incurred loss impairment methodology which involved delayed recognition of credit losses. The amendments introduce an expected credit loss impairment model which requires immediate recognition of anticipated losses over the instrument’s life. A broader range of reasonable and supportable information must be considered in developing the credit loss estimates. The Companies' financial instruments that would be subject to the amendments include their accounts receivable - customers and other receivables. For public entities, the amendments are effective, and the Companies plan to adopt the amendments, for reporting periods beginning after December 15, 2019. The adoption of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity. The Companies will implement additional internal controls related to the amendments, however the adoption of the amendments is not expected to require a change that will materially affect the Companies’ internal control over financial reporting. In January 2017, the FASB issued amendments to the guidance for the subsequent measurement of goodwill through ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The amendments in this update simplify goodwill impairment testing by eliminating Step 2 of the goodwill impairment test wherein an entity has to compute the implied fair value of goodwill by performing procedures to determine the fair value of its assets and liabilities. Under the new guidance, an entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value up to the total amount of goodwill allocated to that reporting unit. For public entities, the amendments are effective for reporting periods beginning after December 15, 2019. Early adoption is permitted. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity.

Summary of Significant Accounting Policies and Other Matters (Tables)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Disaggregation of Revenue



	For the Three Months Ended September 30, 2019				For the Three Months Ended September 30, 2018
(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
CECONY
Electric	$2,582		$(38)	$2,544	$2,631		$(60)		$2,571
Gas	263		12	275	264		—		264
Steam	54		4	58	64		—		64
Total CECONY	$2,899		$(22)	$2,877	$2,959		$(60)		$2,899
O&R
Electric	205		5	210	215		(3)		212
Gas	25		6	31	31		3		34
Total O&R	$230		$11	$241	$246			$—	$246
Clean Energy Businesses
Renewables	193	(b)	—	193	68	(b)	—		68
Energy services	14		—	14	24		—		24
Other	—		40	40	—		89		89
Total Clean Energy Businesses	$207		$40	$247	$92		$89		$181
Con Edison Transmission	1		—	1	1		—		1
Other (c)	—		(1)	(1)	—		1		1
Total Con Edison	$3,337		$28	$3,365	$3,298		$30		$3,328


(c)	Parent company and consolidation adjustments.



	For the Nine Months Ended September 30, 2019				For the Nine Months Ended September 30, 2018
(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
CECONY
Electric	$6,048		$126	$6,174	$6,106		$1	$6,107
Gas	1,573		32	1,605	1,516		24	1,540
Steam	456		13	469	467		7	474
Total CECONY	$8,077		$171	$8,248	$8,089		$32	$8,121
O&R
Electric	488		5	493	508		(3)	505
Gas	178		7	185	179		7	186
Total O&R	$666		$12	$678	$687		$4	$691
Clean Energy Businesses
Renewables	465	(b)	—	465	273	(b)	—	273
Energy services	53		—	53	65		—	65
Other	—		178	178	—		235	235
Total Clean Energy Businesses	$518		$178	$696	$338		$235	$573
Con Edison Transmission	3		—	3	3		—	3
Other (c)	—		(2)	(2)	—		—	—
Total Con Edison	$9,264		$359	$9,623	$9,117		$271	$9,388

(c)

Parent company and consolidation adjustments.

Change in Unbilled Contract and Unearned Revenues



	2019			2018
(Millions of Dollars)	Unbilled contract revenue (a)	Unearned revenue (b)		Unbilled contract revenue (a)	Unearned revenue (b)
Beginning balance as of January 1,	$29	$20		$58	$87
Additions (c)	63	2		111	34
Subtractions (c)	68	2	(d)	138	105	(d)
Ending balance as of September 30,	$24	$20		$31	$16

(a)


(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, $2 million and $50 million were included in the balance as of January 1, 2019 and 2018, respectively.

Basic and Diluted Earnings Per Share

For the three and nine months ended September 30, 2019 and 2018, basic and diluted EPS for Con Edison are calculated as follows:



	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
(Millions of Dollars, except per share amounts/Shares in Millions)	2019	2018	2019	2018
Net income for common stock	$473	$435	$1,048	$1,051
Weighted average common shares outstanding – basic	332.2	311.1	327.3	310.8
Add: Incremental shares attributable to effect of potentially dilutive securities	1.0	1.2	1.0	1.1
Adjusted weighted average common shares outstanding – diluted	333.2	312.3	328.3	311.9
Net Income per common share – basic	$1.42	$1.40	$3.20	$3.38
Net Income per common share – diluted	$1.42	$1.39	$3.19	$3.37

Changes in Accumulated Other Comprehensive Income/(Loss)

For the three and nine months ended September 30, 2019 and 2018, changes to accumulated other comprehensive income/(loss) (OCI) for Con Edison and CECONY are as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance, accumulated OCI, net of taxes (a)	$(11)	$(20)	$(5)	$(5)
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2019 and 2018 (a)(b)	1	2	1	—
Current period OCI, net of taxes	1	2	1	—
Ending balance, accumulated OCI, net of taxes	$(10)	$(18)	$(4)	$(5)



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance, accumulated OCI, net of taxes (a)	$(16)	$(26)	$(5)	$(6)
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018	2	3	—	—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) and $(2) for Con Edison in 2019 and 2018, respectively (a)(b)	4	5	1	1
Current period OCI, net of taxes	6	8	1	1
Ending balance, accumulated OCI, net of taxes	$(10)	$(18)	$(4)	$(5)


(a)	Tax reclassified from accumulated OCI is reported in the income tax expense line item of the consolidated income statement.

(b)

For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of total periodic pension and other postretirement benefit cost. See Notes E and F.

Restrictions on Cash and Cash Equivalents

At September 30, 2019 and 2018, cash, temporary cash investments and restricted cash for Con Edison and CECONY are as follows:



	At September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Cash and temporary cash investments	$78	$199	$15	$17
Restricted cash (a)	175	46	—	—
Total cash, temporary cash investments and restricted cash	$253	$245	$15	$17

(a)

Schedule of Cash and Cash Equivalents

At September 30, 2019 and 2018, cash, temporary cash investments and restricted cash for Con Edison and CECONY are as follows:



	At September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Cash and temporary cash investments	$78	$199	$15	$17
Restricted cash (a)	175	46	—	—
Total cash, temporary cash investments and restricted cash	$253	$245	$15	$17

(a)

Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2019

Regulated Operations [Abstract]

Summary of Utilities Rate Plans

The following tables contain a summary of the rate plans.



CECONY Electric
Effective period		January 2020 – December 2022 (c)
Base rate changes (a)		Yr. 1 – $113 million Yr. 2 – $370 million Yr. 3 – $326 million
Amortizations to income of net regulatory liabilities (b)		Yr. 1 – $267 million Yr. 2 – $269 million Yr. 3 – $272 million
Other revenue sources		Retention of $75 million of annual transmission congestion revenues. Potential earnings adjustment mechanism incentives for energy efficiency and other potential incentives of up to: Yr. 1 - $69 million; Yr. 2 - $74 million; and Yr. 3 - $79 million.
Revenue decoupling mechanism		Continuation of reconciliation of actual to authorized electric delivery revenues.
Recoverable energy costs		Continuation of current rate recovery of purchased power and fuel costs.
Negative revenue adjustments		Potential charges if certain performance targets relating to service, reliability, safety and other matters are not met: Yr. 1 - $450 million; Yr. 2 - $461 million; and Yr. 3 - $476 million.
Cost reconciliations		Continuation of reconciliation of expenses for pension and other postretirement benefits, variable-rate debt, major storms, property taxes (d), municipal infrastructure support costs (e), the impact of new laws and environmental site investigation and remediation to amounts reflected in rates. (f)
Net utility plant reconciliations		Target levels reflected in rates: Electric average net plant target excluding advanced metering infrastructure (AMI): Yr. 1 - $24,572 million; Yr. 2 - $25,366 million; Yr. 3 - $26,197 million AMI: Yr. 1 - $572 million; Yr. 2 - $740 million; Yr. 3 - $806 million (g)
Average rate base		Yr. 1 - $21,660 million Yr. 2 - $22,783 million Yr. 3 - $23,926 million
Weighted average cost of capital (after-tax)		6.61 percent
Authorized return on common equity		8.80 percent
Earnings sharing		Most earnings above an annual earnings threshold of 9.3 percent are to be applied to reduce regulatory assets for environmental remediation and other costs accumulated in the rate year.
Cost of long-term debt		4.63 percent
Common equity ratio		48 percent

(a)

(b)


(c)	If at the end of any semi-annual period ending June 30 and December 31, Consolidated Edison Inc.’s investments in its non-utility businesses exceed 15 percent of its total consolidated revenues, assets or cash flow, or if the ratio of holding company debt to total

consolidated debt rises above 20 percent, CECONY is required to notify the NYSPSC and submit a ring-fencing plan or a demonstration why additional ring-fencing measures are not necessary.


(d)	Deferrals for property taxes are limited to 90 percent of the difference from amounts reflected in rates, subject to an annual maximum for the remaining difference of not more than a maximum number of basis points impact on return on common equity: Yr. 1 - 10.0 basis points; Yr. 2 - 7.5 basis points; and Yr. 3 - 5.0 basis points.

(e)


(f)	In addition, the NYSPSC staff has commenced a focused operations audit to investigate the income tax accounting of CECONY and other New York utilities. Any NYSPSC-ordered adjustment to CECONY’s income tax accounting will be refunded to or collected from customers, as determined by the NYSPSC.


(g)	Reconciliation of net utility plant for AMI will be done on a combined basis for electric and gas.



CECONY Gas
Effective period		January 2020 – December 2022 (c)
Base rate changes (a)		Yr. 1 – $84 million Yr. 2 – $122 million Yr. 3 – $167 million
Amortizations to income of net regulatory liabilities (b)		Yr. 1 – $45 million Yr. 2 – $43 million Yr. 3 – $10 million
Other revenue sources		Retention of annual revenues from non-firm customers of up to $65 million and 15 percent of any such revenues above $65 million. Potential earnings adjusted mechanism incentives for energy efficiency and other potential incentives of up to Yr. 1 - $20 million; Yr. 2 - $22 million; and Yr. 3 - $25 million
Revenue decoupling mechanism		Continuation of reconciliation of actual to authorized gas delivery revenues, modified to be calculated based upon revenue per customer class instead of revenue per customer.
Recoverable energy costs		Continuation of current rate recovery of purchased gas costs.
Negative revenue adjustments		Potential charges if performance targets relating to service, safety and other matters are not met: Yr. 1 - $81 million; Yr. 2 - $88 million; and Yr. 3 - $96 million.
Cost reconciliations		Continuation of reconciliation of expenses for pension and other postretirement benefits, variable-rate debt, major storms, property taxes (d), municipal infrastructure support costs (e), the impact of new laws and environmental site investigation and remediation to amounts reflected in rates. (f)
Net utility plant reconciliations		Target levels reflected in rates: Gas average net plant target excluding AMI: Yr. 1 - $8,123 million; Yr. 2 - $8,861 million; Yr. 3 - $9,600 million AMI: Yr. 1 - $142 million; Yr. 2 - $183 million; Yr. 3 - $211 million (g)
Average rate base		Yr. 1 - $7,171 million Yr. 2 - $7,911 million Yr. 3 - $8,622 million
Weighted average cost of capital (after-tax)		6.61 percent
Authorized return on common equity		8.80 percent
Earnings sharing		Most earnings above an annual earnings threshold of 9.3 percent are to be applied to reduce regulatory assets for environmental remediation and other costs accumulated in the rate year.
Cost of long-term debt		4.63 percent
Common equity ratio		48 percent

(a)

(b)

(c)-(g)

See footnotes (c), (d), (e), (f) and (g) to the table under “CECONY Electric,” above.

Schedule of Regulatory Assets

Regulatory assets and liabilities at September 30, 2019 and December 31, 2018 were comprised of the following items:



	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Regulatory assets
Unrecognized pension and other postretirement costs	$1,919	$2,238	$1,816	$2,111
Environmental remediation costs	774	810	685	716
Revenue taxes	315	291	302	278
MTA power reliability deferral	245	229	245	229
Property tax reconciliation	160	101	150	86
Deferred derivative losses	99	17	90	11
Municipal infrastructure support costs	80	67	80	67
Pension and other postretirement benefits deferrals	77	73	55	56
Deferred storm costs	69	76	—	—
System peak reduction and energy efficiency programs	60	72	59	70
Meadowlands heater odorization project	35	36	35	36
Brooklyn Queens demand management program	35	39	35	39
Unamortized loss on reacquired debt	30	36	28	34
Preferred stock redemption	22	23	22	23
Recoverable REV demonstration project costs	21	20	18	18
Gate station upgrade project	19	17	19	17
Workers’ compensation	5	5	5	5
O&R transition bond charges	—	2	—	—
Other	194	142	187	127
Regulatory assets – noncurrent	4,159	4,294	3,831	3,923
Deferred derivative losses	68	36	57	29
Recoverable energy costs	15	40	12	35
Regulatory assets – current	83	76	69	64
Total Regulatory Assets	$4,242	$4,370	$3,900	$3,987
Regulatory liabilities
Future income tax	$2,448	$2,515	$2,302	$2,363
Allowance for cost of removal less salvage	952	928	808	790
TCJA net benefits*	462	434	444	411
Net unbilled revenue deferrals	145	117	145	117
Energy efficiency portfolio standard unencumbered funds	123	127	119	122
Pension and other postretirement benefit deferrals	67	62	41	40
Property tax refunds	45	45	45	45
Net proceeds from sale of property	44	6	44	6
System benefit charge carrying charge	43	27	38	24
Earnings sharing - electric, gas and steam	26	36	19	27
BQDM and REV Demo reconciliations	25	18	24	18
Settlement of prudence proceeding	15	37	15	37
Settlement of gas proceedings	11	15	11	15
Unrecognized other postretirement costs	5	7	—	7
Carrying charges on repair allowance and bonus depreciation	4	21	4	21
New York State income tax rate change	3	17	3	17
Base rate change deferrals	1	10	1	10
Property tax reconciliation	—	36	—	36
Other	171	183	137	152
Regulatory liabilities – noncurrent	4,590	4,641	4,200	4,258
Refundable energy costs	36	31	8	8
Deferred derivative gains	33	30	32	29
Revenue decoupling mechanism	24	53	16	36
Regulatory liabilities – current	93	114	56	73
Total Regulatory Liabilities	$4,683	$4,755	$4,256	$4,331

* See "Other Regulatory Matters," above.

Schedule of Regulatory Liabilities

Regulatory assets and liabilities at September 30, 2019 and December 31, 2018 were comprised of the following items:



	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Regulatory assets
Unrecognized pension and other postretirement costs	$1,919	$2,238	$1,816	$2,111
Environmental remediation costs	774	810	685	716
Revenue taxes	315	291	302	278
MTA power reliability deferral	245	229	245	229
Property tax reconciliation	160	101	150	86
Deferred derivative losses	99	17	90	11
Municipal infrastructure support costs	80	67	80	67
Pension and other postretirement benefits deferrals	77	73	55	56
Deferred storm costs	69	76	—	—
System peak reduction and energy efficiency programs	60	72	59	70
Meadowlands heater odorization project	35	36	35	36
Brooklyn Queens demand management program	35	39	35	39
Unamortized loss on reacquired debt	30	36	28	34
Preferred stock redemption	22	23	22	23
Recoverable REV demonstration project costs	21	20	18	18
Gate station upgrade project	19	17	19	17
Workers’ compensation	5	5	5	5
O&R transition bond charges	—	2	—	—
Other	194	142	187	127
Regulatory assets – noncurrent	4,159	4,294	3,831	3,923
Deferred derivative losses	68	36	57	29
Recoverable energy costs	15	40	12	35
Regulatory assets – current	83	76	69	64
Total Regulatory Assets	$4,242	$4,370	$3,900	$3,987
Regulatory liabilities
Future income tax	$2,448	$2,515	$2,302	$2,363
Allowance for cost of removal less salvage	952	928	808	790
TCJA net benefits*	462	434	444	411
Net unbilled revenue deferrals	145	117	145	117
Energy efficiency portfolio standard unencumbered funds	123	127	119	122
Pension and other postretirement benefit deferrals	67	62	41	40
Property tax refunds	45	45	45	45
Net proceeds from sale of property	44	6	44	6
System benefit charge carrying charge	43	27	38	24
Earnings sharing - electric, gas and steam	26	36	19	27
BQDM and REV Demo reconciliations	25	18	24	18
Settlement of prudence proceeding	15	37	15	37
Settlement of gas proceedings	11	15	11	15
Unrecognized other postretirement costs	5	7	—	7
Carrying charges on repair allowance and bonus depreciation	4	21	4	21
New York State income tax rate change	3	17	3	17
Base rate change deferrals	1	10	1	10
Property tax reconciliation	—	36	—	36
Other	171	183	137	152
Regulatory liabilities – noncurrent	4,590	4,641	4,200	4,258
Refundable energy costs	36	31	8	8
Deferred derivative gains	33	30	32	29
Revenue decoupling mechanism	24	53	16	36
Regulatory liabilities – current	93	114	56	73
Total Regulatory Liabilities	$4,683	$4,755	$4,256	$4,331

* See "Other Regulatory Matters," above.

Pension Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Total Periodic Benefit Costs

The components of the Companies’ total periodic benefit cost for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost – including administrative expenses	$62	$72	$58	$68
Interest cost on projected benefit obligation	150	140	141	131
Expected return on plan assets	(247)	(258)	(234)	(245)
Recognition of net actuarial loss	130	172	123	163
Recognition of prior service cost/(credit)	(4)	(4)	(5)	(5)
TOTAL PERIODIC BENEFIT COST	$91	$122	$83	$112
Cost capitalized	(26)	(32)	(24)	(30)
Reconciliation to rate level	(5)	(22)	(4)	(24)
Total expense recognized	$60	$68	$55	$58



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost – including administrative expenses	$187	$218	$175	$204
Interest cost on projected benefit obligation	451	420	423	394
Expected return on plan assets	(741)	(775)	(702)	(734)
Recognition of net actuarial loss	389	516	369	488
Recognition of prior service cost/(credit)	(13)	(13)	(15)	(15)
TOTAL PERIODIC BENEFIT COST	$273	$366	$250	$337
Cost capitalized	(80)	(94)	(76)	(89)
Reconciliation to rate level	(12)	(68)	(10)	(74)
Total expense recognized	$181	$204	$164	$174

The components of the Companies’ total periodic other postretirement benefit cost/(credit) for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost	$4	$5	$3	$3
Interest cost on accumulated other postretirement benefit obligation	11	11	9	9
Expected return on plan assets	(16)	(18)	(14)	(16)
Recognition of net actuarial loss/(gain)	(2)	2	(2)	1
Recognition of prior service cost/(credit)	(1)	(2)	—	(1)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	$(4)	$(2)	$(4)	$(4)
Cost capitalized	(1)	(2)	(2)	(1)
Reconciliation to rate level	3	2	2	2
Total expense/(credit) recognized	$(2)	$(2)	$(4)	$(3)



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost	$13	$15	$9	$10
Interest cost on accumulated other postretirement benefit obligation	33	32	27	26
Expected return on plan assets	(49)	(55)	(41)	(47)
Recognition of net actuarial loss/(gain)	(6)	6	(7)	2
Recognition of prior service cost/(credit)	(2)	(5)	(1)	(2)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	$(11)	$(7)	$(13)	$(11)
Cost capitalized	(6)	(6)	(4)	(4)
Reconciliation to rate level	10	6	6	7
Total expense/(credit) recognized	$(7)	$(7)	$(11)	$(8)

Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Total Periodic Benefit Costs

The components of the Companies’ total periodic benefit cost for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost – including administrative expenses	$62	$72	$58	$68
Interest cost on projected benefit obligation	150	140	141	131
Expected return on plan assets	(247)	(258)	(234)	(245)
Recognition of net actuarial loss	130	172	123	163
Recognition of prior service cost/(credit)	(4)	(4)	(5)	(5)
TOTAL PERIODIC BENEFIT COST	$91	$122	$83	$112
Cost capitalized	(26)	(32)	(24)	(30)
Reconciliation to rate level	(5)	(22)	(4)	(24)
Total expense recognized	$60	$68	$55	$58



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost – including administrative expenses	$187	$218	$175	$204
Interest cost on projected benefit obligation	451	420	423	394
Expected return on plan assets	(741)	(775)	(702)	(734)
Recognition of net actuarial loss	389	516	369	488
Recognition of prior service cost/(credit)	(13)	(13)	(15)	(15)
TOTAL PERIODIC BENEFIT COST	$273	$366	$250	$337
Cost capitalized	(80)	(94)	(76)	(89)
Reconciliation to rate level	(12)	(68)	(10)	(74)
Total expense recognized	$181	$204	$164	$174

The components of the Companies’ total periodic other postretirement benefit cost/(credit) for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost	$4	$5	$3	$3
Interest cost on accumulated other postretirement benefit obligation	11	11	9	9
Expected return on plan assets	(16)	(18)	(14)	(16)
Recognition of net actuarial loss/(gain)	(2)	2	(2)	1
Recognition of prior service cost/(credit)	(1)	(2)	—	(1)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	$(4)	$(2)	$(4)	$(4)
Cost capitalized	(1)	(2)	(2)	(1)
Reconciliation to rate level	3	2	2	2
Total expense/(credit) recognized	$(2)	$(2)	$(4)	$(3)



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Service cost	$13	$15	$9	$10
Interest cost on accumulated other postretirement benefit obligation	33	32	27	26
Expected return on plan assets	(49)	(55)	(41)	(47)
Recognition of net actuarial loss/(gain)	(6)	6	(7)	2
Recognition of prior service cost/(credit)	(2)	(5)	(1)	(2)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	$(11)	$(7)	$(13)	$(11)
Cost capitalized	(6)	(6)	(4)	(4)
Reconciliation to rate level	10	6	6	7
Total expense/(credit) recognized	$(7)	$(7)	$(11)	$(8)

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Lease Costs, Cash Flows and Other Related Information

Other information related to leases for Con Edison and CECONY at September 30, 2019 was as follows:



	Con Edison	CECONY
Weighted Average Remaining Lease Term:
Operating leases	18.9 years	14.3 years
Finance leases	11.2 years	2.3 years
Weighted Average Discount Rate:
Operating leases	4.3%	3.6%
Finance leases	3.8%	4.7%

Operating lease cost and cash paid for amounts included in the measurement of lease liabilities for the three and nine months ended September 30, 2019 were as follows:

Operating Leases, Future Minimum Lease Payments

Future minimum lease payments under non-cancellable leases at September 30, 2019 were as follows:



(Millions of Dollars)	Con Edison			CECONY
Year Ending September 30,	Operating Leases	Finance Leases		Operating Leases	Finance Leases
2020	$74	$1		$58	$1
2021	73	—		57	—
2022	69	—		53	—
2023	69	—		53	—
2024	69	—		53	—
All years thereafter	966	1		550	—
Total future minimum lease payments	$1,320	$2		$824	$1
Less: imputed interest	(442)	—		(180)	—
Total	$878	$2		$644	$1
Reported as of September 30, 2019
Operating lease liabilities (current)	$59		$—	$49		$—
Operating lease liabilities (noncurrent)	819	—		595	—
Other current liabilities	—	1		—	1
Other noncurrent liabilities	—	1		—	—
Total	$878	$2		$644	$1

Finance Leases, Future Minimum Lease Payments

Future minimum lease payments under non-cancellable leases at September 30, 2019 were as follows:



(Millions of Dollars)	Con Edison			CECONY
Year Ending September 30,	Operating Leases	Finance Leases		Operating Leases	Finance Leases
2020	$74	$1		$58	$1
2021	73	—		57	—
2022	69	—		53	—
2023	69	—		53	—
2024	69	—		53	—
All years thereafter	966	1		550	—
Total future minimum lease payments	$1,320	$2		$824	$1
Less: imputed interest	(442)	—		(180)	—
Total	$878	$2		$644	$1
Reported as of September 30, 2019
Operating lease liabilities (current)	$59		$—	$49		$—
Operating lease liabilities (noncurrent)	819	—		595	—
Other current liabilities	—	1		—	1
Other noncurrent liabilities	—	1		—	—
Total	$878	$2		$644	$1

Future Minimum Lease Commitments Accounted for Under Topic 840

The future minimum lease commitments at December 31, 2018, accounted for under Topic 840, for the Companies’ operating lease agreements that are not cancellable by the Companies were as follows:



(Millions of Dollars)	Con Edison	CECONY
2019	$72	$56
2020	72	56
2021	71	54
2022	68	53
2023	68	53
All years thereafter	890	592
Total	$1,241	$864

Financial Information by Business Segment (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Financial Data for Business Segments

The financial data for the business segments for the three and nine months ended September 30, 2019 and 2018 were as follows:



	For the Three Months Ended September 30,
	Operating revenues		Inter-segment revenues				Depreciation and amortization		Operating income/(loss)
(Millions of Dollars)	2019	2018	2019		2018		2019	2018	2019	2018
CECONY
Electric	$2,544	$2,571	$4		$4		$266	$248	$803	$850
Gas	275	264	2		2		58	52	(24)	(34)
Steam	58	64	18		19		22	22	(56)	(52)
Consolidation adjustments	—	—	(24)		(25)		—	—	—	—
Total CECONY	$2,877	$2,899		$—		$—	$346	$322	$723	$764
O&R
Electric	$210	$212		$—		$—	$16	$14	$56	$52
Gas	31	34	—		—		6	5	(10)	(10)
Total O&R	$241	$246		$—		$—	$22	$19	$46	$42
Clean Energy Businesses	$247	$181		$—		$—	$53	$18	$100	$25
Con Edison Transmission	1	1	—		—		—	—	(1)	(2)
Other (a)	(1)	1	—		—		—	1	(1)	(3)
Total Con Edison	$3,365	$3,328		$—		$—	$421	$360	$867	$826

(a) Parent company and consolidation adjustments. Other does not represent a business segment.



	For the Nine Months Ended September 30,
	Operating revenues		Inter-segment revenues				Depreciation and amortization		Operating income/(loss)
(Millions of Dollars)	2019	2018	2019		2018		2019	2018	2019	2018
CECONY
Electric	$6,174	$6,107	$13		$12		$785	$732	$1,374	$1,421
Gas	1,605	1,540	6		6		168	152	414	369
Steam	469	474	52		56		67	65	37	60
Consolidation adjustments	—	—	(71)		(74)		—	—	—	—
Total CECONY	$8,248	$8,121		$—		$—	$1,020	$949	$1,825	$1,850
O&R
Electric	$493	$505		$—		$—	$46	$41	$88	$79
Gas	185	186	—		—		17	16	25	31
Total O&R	$678	$691		$—		$—	$63	$57	$113	$110
Clean Energy Businesses	696	573	—		—		169	55	183	59
Con Edison Transmission	3	3	—		—		1	1	(5)	(5)
Other (a)	(2)	—	—		—		—	(1)	(5)	(7)
Total Con Edison	$9,623	$9,388		$—		$—	$1,253	$1,061	$2,111	$2,007

(a) Parent company and consolidation adjustments. Other does not represent a business segment.

Derivative Instruments and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Offsetting of Liabilities

The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at September 30, 2019 and December 31, 2018 were:



(Millions of Dollars)	2019				2018
Balance Sheet Location	Gross Amounts of Recognized Assets/(Liabilities)	Gross Amounts Offset	Net Amounts of Assets/ (Liabilities) (a)		Gross Amounts of Recognized Assets/(Liabilities)	Gross Amounts Offset	Net Amounts of Assets/ (Liabilities) (a)
Con Edison
Fair value of derivative assets
Current	$51	$(8)	$43	(b)	$43	$(14)	$29	(b)
Noncurrent	7	(7)	—		16	(7)	9	(d)
Total fair value of derivative assets	$58	$(15)	$43		$59	$(21)	$38
Fair value of derivative liabilities
Current	$(89)	$17	$(72)	(c)	$(61)	$11	$(50)
Noncurrent	(156)	9	(147)	(c)	(25)	9	(16)	(d)
Total fair value of derivative liabilities	$(245)	$26	$(219)		$(86)	$20	$(66)
Net fair value derivative assets/(liabilities)	$(187)	$11	$(176)		$(27)	$(1)	$(28)
CECONY
Fair value of derivative assets
Current	$42	$(19)	$23	(b)	$25	$(6)	$19	(b)
Noncurrent	6	(6)	—		11	(5)	6
Total fair value of derivative assets	$48	$(25)	$23		$36	$(11)	$25
Fair value of derivative liabilities
Current	$(61)	$28	$(33)		$(31)	$6	$(25)
Noncurrent	(90)	8	(82)		(12)	6	(6)
Total fair value of derivative liabilities	$(151)	$36	$(115)		$(43)	$12	$(31)
Net fair value derivative assets/(liabilities)	$(103)	$11	$(92)		$(7)	$1	$(6)

(a)

(b)


(c)	Includes amounts for interest rate swaps of $(7) million in current liabilities and $(57) million in noncurrent liabilities. At September 30, 2019, the Clean Energy Businesses had interest rate swaps with notional amounts of $934 million. The expiration dates of the swaps range from 2024-2041.

(d)

Includes amounts for interest rate swaps of $2 million in noncurrent assets and $(6) million in noncurrent liabilities. At December 31, 2018, the Clean Energy Business had interest rate swaps with notional amounts of $499 million. The expiration dates of the swaps range from 2024-2035.

Offsetting of Assets

The fair values of the Companies’ derivatives including the offsetting of assets and liabilities on the consolidated balance sheet at September 30, 2019 and December 31, 2018 were:



(Millions of Dollars)	2019				2018
Balance Sheet Location	Gross Amounts of Recognized Assets/(Liabilities)	Gross Amounts Offset	Net Amounts of Assets/ (Liabilities) (a)		Gross Amounts of Recognized Assets/(Liabilities)	Gross Amounts Offset	Net Amounts of Assets/ (Liabilities) (a)
Con Edison
Fair value of derivative assets
Current	$51	$(8)	$43	(b)	$43	$(14)	$29	(b)
Noncurrent	7	(7)	—		16	(7)	9	(d)
Total fair value of derivative assets	$58	$(15)	$43		$59	$(21)	$38
Fair value of derivative liabilities
Current	$(89)	$17	$(72)	(c)	$(61)	$11	$(50)
Noncurrent	(156)	9	(147)	(c)	(25)	9	(16)	(d)
Total fair value of derivative liabilities	$(245)	$26	$(219)		$(86)	$20	$(66)
Net fair value derivative assets/(liabilities)	$(187)	$11	$(176)		$(27)	$(1)	$(28)
CECONY
Fair value of derivative assets
Current	$42	$(19)	$23	(b)	$25	$(6)	$19	(b)
Noncurrent	6	(6)	—		11	(5)	6
Total fair value of derivative assets	$48	$(25)	$23		$36	$(11)	$25
Fair value of derivative liabilities
Current	$(61)	$28	$(33)		$(31)	$6	$(25)
Noncurrent	(90)	8	(82)		(12)	6	(6)
Total fair value of derivative liabilities	$(151)	$36	$(115)		$(43)	$12	$(31)
Net fair value derivative assets/(liabilities)	$(103)	$11	$(92)		$(7)	$1	$(6)

(a)

(b)


(c)	Includes amounts for interest rate swaps of $(7) million in current liabilities and $(57) million in noncurrent liabilities. At September 30, 2019, the Clean Energy Businesses had interest rate swaps with notional amounts of $934 million. The expiration dates of the swaps range from 2024-2041.


(d)	Includes amounts for interest rate swaps of $2 million in noncurrent assets and $(6) million in noncurrent liabilities. At December 31, 2018, the Clean Energy Business had interest rate swaps with notional amounts of $499 million. The expiration dates of the swaps range from 2024-2035.

Realized and Unrealized Gains or Losses on Commodity Derivatives



		For the Three Months Ended September 30,
		Con Edison			CECONY
(Millions of Dollars)	Balance Sheet Location	2019	2018		2019		2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$15	$6		$15		$6
Noncurrent	Deferred derivative gains	—	—		—		2
Total deferred gains/(losses)		$15	$6		$15		$8
Current	Deferred derivative losses	$6	$25		$6		$25
Current	Recoverable energy costs	(35)	(4)		(32)		(6)
Noncurrent	Deferred derivative losses	18	15		16		14
Total deferred gains/(losses)		$(11)	$36		$(10)		$33
Net deferred gains/(losses)		$4	$42		$5		$41
	Income Statement Location
Pre-tax gains/(losses) recognized in income
	Gas purchased for resale	$1		$—		$—		$—
	Non-utility revenue	5	(7)		—		—
	Other operations and maintenance expense	(1)	—		(1)
	Other interest expense	(26)	—		—		—
Total pre-tax gains/(losses) recognized in income		$(21)	$(7)		$(1)			$—



		For the Nine Months Ended September 30,
		Con Edison		CECONY
(Millions of Dollars)	Balance Sheet Location	2019	2018	2019		2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$3	$(11)	$3		$(10)
Noncurrent	Deferred derivative gains	(8)	5	(5)		4
Total deferred gains/(losses)		$(5)	$(6)	$(2)		$(6)
Current	Deferred derivative losses	$(32)	$21	$(28)		$23
Current	Recoverable energy costs	(94)	(13)	(82)		(14)
Noncurrent	Deferred derivative losses	(82)	23	(79)		21
Total deferred gains/(losses)		$(208)	$31	$(189)		$30
Net deferred gains/(losses)		$(213)	$25	$(191)		$24
	Income Statement Location
Pre-tax gains/(losses) recognized in income
	Gas purchased for resale	$(2)	$(1)		$—		$—
	Non-utility revenue	20	(7)	—		—
	Other interest expense	(60)	—	—		—
Total pre-tax gains/(losses) recognized in income		$(42)	$(8)		$—		$—

Hedged Volume of Derivative Transactions

The following table presents the hedged volume of Con Edison’s and CECONY’s commodity derivative transactions at September 30, 2019:



	Electric Energy (MWh) (a)(b)	Capacity (MW) (a)	Natural Gas (Dt) (a)(b)	Refined Fuels (gallons)
Con Edison	27,843,993	25,054	277,395,718	6,720,000
CECONY	25,361,275	16,800	260,350,000	6,720,000


(a)	Volumes are reported net of long and short positions, except natural gas collars where the volumes of long positions are reported.


(b)	Excludes electric congestion and gas basis swap contracts, which are associated with electric and gas contracts and hedged volumes.

Aggregate Fair Value of Companies' Derivative Instruments with Credit-Risk-Related Contingent Features



(Millions of Dollars)	Con Edison (a)		CECONY (a)
Aggregate fair value – net liabilities	$112		$95
Collateral posted	26		20
Additional collateral (b) (downgrade one level from current ratings)	18		14
Additional collateral (b) (downgrade to below investment grade from current ratings)	123	(c)	92	(c)

(a)

(b)

(c)

- Definition

Tabular disclosure of credit derivatives which includes information by sellers of credit derivatives, about each credit derivative, or each group of similar credit derivatives, including (a) the nature of the credit derivative - its term, how it arose, the events or circumstances that would require the seller to perform under the credit derivative, and the current status of the payment/performance risk of the credit derivative; (b) the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative; (c) the current fair value of the credit derivative; and (d) the nature of any recourse provisions under the credit derivative, and any assets held either as collateral or by third parties. A credit derivative is a derivative instrument (1) in which one or more of its underlyings are related to the credit risk of a specified entity (or a group of entities) or an index based on the credit risk of a group of entities and (2) that exposes the seller to potential loss from credit-risk-related events specified in the contract. Examples of credit derivatives within the scope of this paragraph include, but are not limited to, credit default swaps, credit spread options, and credit index products; also includes a hybrid instrument that has an embedded credit derivative (for example, but not limited to, a credit-linked note).

+ References + Details

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

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+ Details

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018 are summarized below.



	2019						2018
(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)	$4	$33	$2	$11		$50	$6	$36	$7	$(6)	$43
Interest rate swaps (a)(b)(c)	—	—	—	—		—	—	2	—	—	2
Other (a)(b)(d)	330	123	—	—		453	287	114	—	—	401
Total assets	$334	$156	$2	$11		$503	$293	$152	$7	$(6)	$446
Derivative liabilities:
Commodity (a)(b)(c)	$18	$98	$46	$(7)		$155	$8	$43	$20	$(11)	$60
Interest rate swaps (a)(b)(c)	—	64	—	—		64	—	6	—	—	6
Total liabilities	$18	$162	$46	$(7)		$219	$8	$49	$20	$(11)	$66
CECONY
Derivative assets:
Commodity (a)(b)(c)	$3	$25	$1		$—	$29	$3	$28	$1	$(1)	$31
Other (a)(b)(d)	310	117	—	—		427	267	109	—	—	376
Total assets	$313	$142	$1		$—	$456	$270	$137	$1	$(1)	$407
Derivative liabilities:
Commodity (a)(b)(c)	$15	$87	$32	$(19)		$115	$5	$30	$3	$(6)	$32


(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 no transfers between levels 1, 2, and 3 during the nine months ended September 30, 2019.

(b)

(c)


(d)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.


(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.

Schedule of Commodity Derivatives



	Fair Value of Level 3 at September 30, 2019	Valuation Techniques	Unobservable Inputs	Range
	(Millions of Dollars)	Valuation Techniques	Unobservable Inputs	Range
Con Edison – Commodity
Electricity	$(26)	Discounted Cash Flow	Forward energy prices (a)	$16.20-$71.77 per MWh
	(18)	Discounted Cash Flow	Forward capacity prices (a)	$0.45-$7.75 per kW-month
Natural Gas	(1)	Discounted Cash Flow	Forward natural gas prices (a)	$0.97-$2.43 per Dt
Transmission Congestion Contracts/Financial Transmission Rights	1	Discounted Cash Flow	Inter-zonal forward price curves adjusted for historical zonal losses (b)	$(1.00)-$7.03 per MWh
Total Con Edison—Commodity	$(44)
CECONY – Commodity
Electricity	$(24)	Discounted Cash Flow	Forward energy prices (a)	$23.40-$71.77 per MWh
	(8)	Discounted Cash Flow	Forward capacity prices (a)	$0.45-$7.75 per kW-month
Transmission Congestion Contracts	1	Discounted Cash Flow	Inter-zonal forward price curves adjusted for historical zonal losses (b)	$0.35-$4.11 per MWh
Total CECONY—Commodity	$(31)


(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



	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance as of July 1,	$(46)	$(4)	$(30)		$—
Included in earnings	4	4	1	2
Included in regulatory assets and liabilities	(1)	(4)	(1)	—
Settlements	(1)	(6)	(1)	(2)
Ending balance as of September 30,	$(44)	$(10)	$(31)		$—



	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2019	2018	2019	2018
Beginning balance as of January 1,	$(13)	$1	$(2)	$4
Included in earnings	(2)	4	1	4
Included in regulatory assets and liabilities	(32)	(7)	(29)	(5)
Settlements	3	(9)	(1)	(4)
Transfer out of level 3	—	1	—	1
Ending balance as of September 30,	$(44)	$(10)	$(31)		$—

Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 2019

Equity Method Investments and Joint Ventures [Abstract]

Summary of VIEs

At September 30, 2019 and December 31, 2018, Con Edison’s consolidated balance sheet included the following amounts associated with its VIEs:



	Tax Equity Projects
	Great Valley Solar (c)(d)				Copper Mountain - Mesquite Solar (c)(e)				Texas Solar 4 (c)(f)
(Millions of Dollars)	2019		2018		2019		2018		2018
Restricted cash		$—		$—		$—		$—	$4
Non-utility property, less accumulated depreciation (g)(h)	295		313		465		492		98
Other assets	47		18		131		97		9
Total assets (a)	$342		$331		$596		$589		$111
Long-term debt due within one year		$—		$—		$—		$—	$2
Other liabilities	19		17		22		33		26
Long-term debt	—		—		—		—		56
Total liabilities (b)	$19		$17		$22		$33		$84


(a)	The assets of the Tax Equity Projects represent assets of a consolidated VIE that can be used only to settle obligations of the consolidated VIE.


(b)	The liabilities of the Tax Equity Projects represent liabilities of a consolidated VIE for which creditors do not have recourse to the general credit of the primary beneficiary.


(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 $57 million and $33 million at September 30, 2019 and December 31, 2018, respectively.


(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 $115 million and $71 million at September 30, 2019 and December 31, 2018, respectively.


(f)	Noncontrolling interest of the third party was $7 million at December 31, 2018.


(g)	Non-utility property is reduced by accumulated depreciation of $7 million for Great Valley Solar and $10 million for Copper Mountain - Mesquite Solar at September 30, 2019.

(h)

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Summary of Significant Accounting Policies and Other Matters - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 3,337	$ 3,298	$ 9,264	$ 9,117
Total revenues	3,365	3,328	9,623	9,388
Other
Disaggregation of Revenue [Line Items]
Total revenues	28	30	359	271
Clean Energy Businesses \| Renewables \| Engineering, procurement and construction
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3	3	9	100
CECONY
Disaggregation of Revenue [Line Items]
Total revenues	2,877	2,899	8,248	8,121
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	3,365	3,328	9,623	9,388
Operating Segments \| Clean Energy Businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	207	92	518	338
Total revenues	247	181	696	573
Operating Segments \| Clean Energy Businesses \| Other
Disaggregation of Revenue [Line Items]
Total revenues	40	89	178	235
Operating Segments \| Clean Energy Businesses \| Renewables
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	193	68	465	273
Total revenues	193	68	465	273
Operating Segments \| Clean Energy Businesses \| Renewables \| Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments \| Clean Energy Businesses \| Energy services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	14	24	53	65
Total revenues	14	24	53	65
Operating Segments \| Clean Energy Businesses \| Energy services \| Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments \| Clean Energy Businesses \| Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Total revenues	40	89	178	235
Operating Segments \| Clean Energy Businesses \| Other \| Other
Disaggregation of Revenue [Line Items]
Total revenues	40	89	178	235
Operating Segments \| Con Edison Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1	1	3	3
Total revenues	1	1	3	3
Operating Segments \| Con Edison Transmission \| Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating Segments \| CECONY
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,899	2,959	8,077	8,089
Total revenues	2,877	2,899	8,248	8,121
Operating Segments \| CECONY \| Other
Disaggregation of Revenue [Line Items]
Total revenues	(22)	(60)	171	32
Operating Segments \| CECONY \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,582	2,631	6,048	6,106
Total revenues	2,544	2,571	6,174	6,107
Operating Segments \| CECONY \| Electric \| Other
Disaggregation of Revenue [Line Items]
Total revenues	(38)	(60)	126	1
Operating Segments \| CECONY \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	263	264	1,573	1,516
Total revenues	275	264	1,605	1,540
Operating Segments \| CECONY \| Gas \| Other
Disaggregation of Revenue [Line Items]
Total revenues	12	0	32	24
Operating Segments \| CECONY \| Steam
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	54	64	456	467
Total revenues	58	64	469	474
Operating Segments \| CECONY \| Steam \| Other
Disaggregation of Revenue [Line Items]
Total revenues	4	0	13	7
Operating Segments \| O&R
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	230	246	666	687
Total revenues	241	246	678	691
Operating Segments \| O&R \| Other
Disaggregation of Revenue [Line Items]
Total revenues	11	0	12	4
Operating Segments \| O&R \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	205	215	488	508
Total revenues	210	212	493	505
Operating Segments \| O&R \| Electric \| Other
Disaggregation of Revenue [Line Items]
Total revenues	5	(3)	5	(3)
Operating Segments \| O&R \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	25	31	178	179
Total revenues	31	34	185	186
Operating Segments \| O&R \| Gas \| Other
Disaggregation of Revenue [Line Items]
Total revenues	6	3	7	7
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Total revenues	(1)	1	(2)	0
Other \| Other
Disaggregation of Revenue [Line Items]
Total revenues	$ (1)	$ 1	$ (2)	$ 0

Summary of Significant Accounting Policies and Other Matters - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
Unbilled contract revenue
Beginning balance	$ 29	$ 58
Additions	63	111
Subtractions	68	138
Ending balance	24	31
Unearned revenue
Beginning balance	20	87
Additions	2	34
Subtractions	2	105
Ending balance	$ 20	$ 16
Contracts with customer, revenue recognized, amount outstanding end of last period			$ 2	$ 50

Summary of Significant Accounting Policies and Other Matters - Revenue Recognition, Remaining Performance Obligation (Details) $ in Millions	Sep. 30, 2019 USD ($)
Accounting Policies [Abstract]
Remaining performance obligation	$ 89
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 53
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 36
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction

Summary of Significant Accounting Policies and Other Matters - Utility Plant (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 103	$ 29
Software Licenses
Finite-Lived Intangible Assets [Line Items]
Gross asset	95	100
Estimated aggregate annual amortization expense	7
Accumulated amortization	8	3
CECONY \| Software Licenses
Finite-Lived Intangible Assets [Line Items]
Gross asset	90	95
Estimated aggregate annual amortization expense	7
Accumulated amortization	$ 8	$ 3

Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) MW	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	$ 43,234	$ 41,749
Intangible assets	1,580	$ 1,654
PG&E Project
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	827
Intangible assets	1,075
Long-term debt	1,012
PG&E Project \| Secured Related to Project Debt
Finite-Lived Intangible Assets [Line Items]
Net non-utility plant	$ 287
Con Edison Development \| PG&E Project
Finite-Lived Intangible Assets [Line Items]
Aggregate power to be sold (in MW) \| MW	680

Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Net income for common stock	$ 473	$ 435	$ 1,048	$ 1,051
Weighted average common shares outstanding – basic (shares)	332.2	311.1	327.3	310.8
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.0	1.2	1.0	1.1
Adjusted weighted average common shares outstanding – diluted (shares)	333.2	312.3	328.3	311.9
Net income per common share - basic (dollars per share)	$ 1.42	$ 1.40	$ 3.20	$ 3.38
Net income per common share - diluted (dollars per share)	$ 1.42	$ 1.39	$ 3.19	$ 3.37

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

- Definition

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.

+ References

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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

Summary of Significant Accounting Policies and Other Matters - Changes in Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended							9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 17,865	$ 17,501	$ 16,839	$ 15,898	$ 15,655	$ 15,661	$ 15,425	$ 16,839	$ 15,425
Beginning Balance			16,726					16,726
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	1	4	2	2	2	4	6	8
Ending Balance	18,134	17,865	17,501	16,839	15,898	15,655	15,661	18,134	15,898
Ending Balance	17,959			16,726				17,959
Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(11)	(12)	(16)	(18)	(20)	(22)	(26)	(16)	(26)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	1	4	2	2	2	4
Ending Balance	(10)	(11)	(12)	(16)	(18)	(20)	(22)	(10)	(18)
Pension Plan LIabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018								2	3
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	1				2			4	5
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1				2			6	8
Pension Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, tax								(1)	(1)
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax	(1)				(1)			(1)	(2)
CECONY
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	13,868	13,319	12,910	12,869	12,625	12,662	12,439	12,910	12,439
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	0	0	0	0	1	0	1	1
Ending Balance	14,079	13,868	13,319	12,910	12,869	12,625	12,662	14,079	12,869
CECONY \| Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5)	(5)	(5)	(5)	(5)	(6)	(6)	(5)	(6)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1					1
Ending Balance	(4)	$ (5)	$ (5)	$ (5)	(5)	$ (5)	$ (6)	(4)	(5)
CECONY \| Pension Plan Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
OCI before reclassifications, net of tax of $(1) for Con Edison in 2019 and 2018								0	0
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2018	1				0			1	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	$ 1				$ 0			$ 1	$ 1

Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and temporary cash investments	$ 78	$ 895	$ 199
Restricted cash	175		46
Total cash, temporary cash investments and restricted cash	253	1,006	245	$ 844
CEB \| Cash Collateral Held for Project Finance Agreements
Cash and Cash Equivalents [Line Items]
Restricted cash	174		44
CECONY
Cash and Cash Equivalents [Line Items]
Cash and temporary cash investments	15	818	17
Restricted cash	0		0
Total cash, temporary cash investments and restricted cash	15	$ 818	17	$ 730
RECO \| Transition Bond
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 1		$ 2

Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions	1 Months Ended	10 Months Ended	12 Months Ended			36 Months Ended
	May 31, 2019	Oct. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022
CECONY \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)						8.80%
CECONY \| Gas \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)						8.80%
O&R \| NYSPSC \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 5.8	$ 8.0	$ 13.4
O&R \| NYSPSC \| Gas \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 0.7	$ 3.6	$ (7.5)
RECO \| Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 19.9
Return on common equity (as a percent)	49.93%
Common equity ratio (as a percent)	10.00%
Subsequent Event \| RECO \| Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 20.3
Return on common equity (as a percent)		50.16%
Common equity ratio (as a percent)		9.60%
Subsequent Event \| RECO \| New Jersey Board of Public Utilities \| Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 5.8
Return on common equity (as a percent)		8.90%
Common equity ratio (as a percent)		47.14%

Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended		15 Months Ended	36 Months Ended
	Jul. 13, 2019 customer	Mar. 31, 2018 customer	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets			$ 4,242	$ 4,242			$ 4,370
CECONY
Public Utilities, General Disclosures [Line Items]
Regulatory assets			3,900	3,900			$ 3,987
CECONY \| Electric \| West Side of Manhattan
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer	72
Revenues			5
Accrued liabilities, power outages			5	5
CECONY \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		209
Restoration costs								$ 134
Operation and maintenance expenses								15
Operation and maintenance expenses charged against a storm reserve								84
Capital expenditures			$ 29	29
Removal costs								6
CECONY \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA									$ 377
Tax credit, amortization period									3 years
O&R \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		93
Restoration costs								43
RECO \| Electric \| Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers affected with interrupted service \| customer		44
Restoration costs								$ 17
NYSPSC \| CECONY \| Electric \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA						$ 259
NYSPSC \| CECONY \| Gas \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA						113
NYSPSC \| CECONY \| Steam
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA					$ 15
Tax credit, amortization period							3 years
Impact in regulatory liability resulting from TCJA				$ 185
NYSPSC \| CECONY \| Steam \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA						$ 25

Regulatory Matters - Regulatory Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	$ 4,159	$ 4,294
Regulatory assets – current	83	76
Total Regulatory Assets	4,242	4,370
Unrecognized pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	1,919	2,238
Environmental remediation costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	774	810
Revenue taxes
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	315	291
MTA power reliability deferral
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	245	229
Property tax reconciliation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	160	101
Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	99	17
Municipal infrastructure support costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	80	67
Pension and other postretirement benefits deferrals
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	77	73
Deferred storm costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	69	76
System peak reduction and energy efficiency programs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	60	72
Meadowlands heater odorization project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	35	36
Brooklyn Queens demand management program
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	35	39
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	30	36
Preferred stock redemption
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	22	23
Recoverable REV demonstration project costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	21	20
Gate station upgrade project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	19	17
Workers’ compensation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	5	5
O&R transition bond charges
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	2
Other
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	194	142
Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – current	68	36
Recoverable energy costs
Regulatory Assets [Line Items]
Regulatory assets – current	15	40
CECONY
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	3,831	3,923
Regulatory assets – current	69	64
Total Regulatory Assets	3,900	3,987
CECONY \| Unrecognized pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	1,816	2,111
CECONY \| Environmental remediation costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	685	716
CECONY \| Revenue taxes
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	302	278
CECONY \| MTA power reliability deferral
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	245	229
CECONY \| Property tax reconciliation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	150	86
CECONY \| Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	90	11
CECONY \| Municipal infrastructure support costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	80	67
CECONY \| Pension and other postretirement benefits deferrals
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	55	56
CECONY \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	0
CECONY \| System peak reduction and energy efficiency programs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	59	70
CECONY \| Meadowlands heater odorization project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	35	36
CECONY \| Brooklyn Queens demand management program
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	35	39
CECONY \| Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	28	34
CECONY \| Preferred stock redemption
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	22	23
CECONY \| Recoverable REV demonstration project costs
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	18	18
CECONY \| Gate station upgrade project
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	19	17
CECONY \| Workers’ compensation
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	5	5
CECONY \| O&R transition bond charges
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	0	0
CECONY \| Other
Regulatory Assets [Line Items]
Regulatory assets – noncurrent	187	127
CECONY \| Deferred derivative losses
Regulatory Assets [Line Items]
Regulatory assets – current	57	29
CECONY \| Recoverable energy costs
Regulatory Assets [Line Items]
Regulatory assets – current	$ 12	$ 35

Regulatory Matters - Regulatory Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	$ 4,590	$ 4,641
Regulatory liabilities – current	93	114
Total Regulatory Liabilities	4,683	4,755
Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2,448	2,515
Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	952	928
TCJA net benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	462	434
Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	145	117
Energy efficiency portfolio standard unencumbered funds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	123	127
Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	67	62
Property tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	45	45
Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	44	6
System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	43	27
Earnings sharing - electric, gas and steam
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	26	36
BQDM and REV Demo reconciliations
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	25	18
Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	15	37
Settlement of gas proceedings
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	11	15
Unrecognized other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	5	7
Carrying charges on repair allowance and bonus depreciation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4	21
New York State income tax rate change
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	3	17
Base rate change deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1	10
Property tax reconciliation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	0	36
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	171	183
Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	36	31
Deferred derivative gains
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	33	30
Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	24	53
CECONY
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4,200	4,258
Regulatory liabilities – current	56	73
Total Regulatory Liabilities	4,256	4,331
CECONY \| Future income tax
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	2,302	2,363
CECONY \| Allowance for cost of removal less salvage
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	808	790
CECONY \| TCJA net benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	444	411
CECONY \| Net unbilled revenue deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	145	117
CECONY \| Energy efficiency portfolio standard unencumbered funds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	119	122
CECONY \| Pension and other postretirement benefit deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	41	40
CECONY \| Property tax refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	45	45
CECONY \| Net proceeds from sale of property
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	44	6
CECONY \| System benefit charge carrying charge
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	38	24
CECONY \| Earnings sharing - electric, gas and steam
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	19	27
CECONY \| BQDM and REV Demo reconciliations
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	24	18
CECONY \| Settlement of prudence proceeding
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	15	37
CECONY \| Settlement of gas proceedings
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	11	15
CECONY \| Unrecognized other postretirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	0	7
CECONY \| Carrying charges on repair allowance and bonus depreciation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	4	21
CECONY \| New York State income tax rate change
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	3	17
CECONY \| Base rate change deferrals
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	1	10
CECONY \| Property tax reconciliation
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	0	36
CECONY \| Other
Regulatory Liabilities [Line Items]
Regulatory liabilities – noncurrent	137	152
CECONY \| Refundable energy costs
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	8	8
CECONY \| Deferred derivative gains
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	32	29
CECONY \| Revenue decoupling mechanism
Regulatory Liabilities [Line Items]
Regulatory liabilities – current	$ 16	$ 36

Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Electric) (Details) - CECONY - Electric - Scenario, Forecast	36 Months Ended
	Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Retention of annual transmission congestion revenues	$ 75,000,000
Weighted average cost of capital (after-tax) (percent)	6.61%
Authorized return on common equity (percent)	8.80%
Earnings sharing (percent)	9.30%
Cost of long-term debt (percent)	4.63%
Common equity ratio (percent)	48.00%
Income tax benefit to be credited to customers resulting from TCJA	$ 377,000,000
Tax credit, amortization period	3 years
Percentage of total consolidated revenues	15.00%
Percentage of debt to total consolidated debt	20.00%
Deferrals for property taxes limitation from rates (percent)	90.00%
Recovery deferral (percent)	80.00%
Maximum deferral (percent)	15.00%
Deferred MTA Power Reliability Costs
Public Utilities, General Disclosures [Line Items]
Amortization to income of net regulatory (assets) and liabilities	$ 238,000,000
Amortization period	5 years
Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes	$ 113,000,000
Amortization to income of net regulatory (assets) and liabilities	267,000,000
Potential earnings adjustment mechanism incentives	69,000,000
Negative revenue adjustments	450,000,000
Average rate base	21,660,000,000
Base rate, amount of cost recovery	$ 206,000,000
Base rate cost recovery period	10 years
Deferral, annual maximum (not more than) (percent)	0.10%
Year 1 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	$ 24,572,000,000
Year 1 \| Advanced metering infrastructure (AMI)
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	572,000,000
Year 2
Public Utilities, General Disclosures [Line Items]
Base rate changes	370,000,000
Amortization to income of net regulatory (assets) and liabilities	269,000,000
Potential earnings adjustment mechanism incentives	74,000,000
Negative revenue adjustments	461,000,000
Average rate base	22,783,000,000
Base rate, amount of cost recovery	$ 245,000,000
Deferral, annual maximum (not more than) (percent)	0.075%
Year 2 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	$ 25,366,000,000
Year 2 \| Advanced metering infrastructure (AMI)
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	740,000,000
Year 3
Public Utilities, General Disclosures [Line Items]
Base rate changes	326,000,000
Amortization to income of net regulatory (assets) and liabilities	272,000,000
Potential earnings adjustment mechanism incentives	79,000,000
Negative revenue adjustments	476,000,000
Average rate base	23,926,000,000
Base rate, amount of cost recovery	$ 251,000,000
Deferral, annual maximum (not more than) (percent)	0.05%
Year 3 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	$ 26,197,000,000
Year 3 \| Advanced metering infrastructure (AMI)
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	806,000,000
Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	1,663,000,000
Protected Portion \| Year 1
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	49,000,000
Protected Portion \| Year 2
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	50,000,000
Protected Portion \| Year 3
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	53,000,000
Unprotected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	$ 784,000,000
TCJA regulatory liabilities amortization period	5 years
Annually
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA	$ 126,000,000
Annually \| Deferred MTA Power Reliability Costs
Public Utilities, General Disclosures [Line Items]
Amortization to income of net regulatory (assets) and liabilities	48,000,000
Annually \| Unprotected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	$ 157,000,000

Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Gas) (Details) - CECONY - Gas - Scenario, Forecast	36 Months Ended
	Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Percentage of revenue reserve	15.00%
Weighted average cost of capital (after-tax) (percent)	6.61%
Authorized return on common equity (percent)	8.80%
Earnings sharing (percent)	9.30%
Cost of long-term debt (percent)	4.63%
Common equity ratio (percent)	48.00%
Income tax benefit to be credited to customers resulting from TCJA	$ 63,000,000
Base rate cost recovery period	10 years
Tax credit, amortization period	2 years
Maximum
Public Utilities, General Disclosures [Line Items]
Retention of annual transmission congestion revenues	$ 65,000,000
Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes	84,000,000
Amortization to income of net regulatory (assets) and liabilities	45,000,000
Potential incentives if performance targets are met	20,000,000
Negative revenue adjustments	81,000,000
Average rate base	7,171,000,000
Year 1 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	8,123,000,000
Year 1 \| AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	142,000,000
Year 2
Public Utilities, General Disclosures [Line Items]
Base rate changes	122,000,000
Amortization to income of net regulatory (assets) and liabilities	43,000,000
Potential incentives if performance targets are met	22,000,000
Negative revenue adjustments	88,000,000
Average rate base	7,911,000,000
Year 2 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	8,861,000,000
Year 2 \| AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	183,000,000
Year 3
Public Utilities, General Disclosures [Line Items]
Base rate changes	167,000,000
Amortization to income of net regulatory (assets) and liabilities	10,000,000
Potential incentives if performance targets are met	25,000,000
Negative revenue adjustments	96,000,000
Average rate base	8,622,000,000
Year 3 \| Electric average excluding AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	9,600,000,000
Year 3 \| AMI
Public Utilities, General Disclosures [Line Items]
Net utility plant reconciliations	211,000,000
NYSPSC \| Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	47,000,000
Base rate, amount of cost recovery	30,000,000
NYSPSC \| Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	176,000,000
Base rate, amount of cost recovery	37,000,000
NYSPSC \| Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	170,000,000
Base rate, amount of cost recovery	40,000,000
Annually
Public Utilities, General Disclosures [Line Items]
Income tax benefit to be credited to customers resulting from TCJA	32,000,000
Protected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	725,000,000
Protected Portion \| Year 1
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	14,000,000
Protected Portion \| Year 2
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	14,000,000
Protected Portion \| Year 3
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	12,000,000
Unprotected Portion
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	$ 107,000,000
TCJA regulatory liabilities amortization period	5 years
Unprotected Portion \| Annually
Public Utilities, General Disclosures [Line Items]
Impact in regulatory liability resulting from TCJA	$ 21,000,000

Capitalization - Additional Information (Details) - USD ($)	1 Months Ended					3 Months Ended
	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Nov. 30, 2019	Oct. 31, 2019	Sep. 30, 2019
Schedule of Capitalization [Line Items]
Number of shares of common stock issued (shares)				5,649,369
Value of common stock issued				$ 425,000,000		$ 400,000,000	$ 425,000,000	$ 705,000,000
Term loan								825,000,000				$ 0
PG&E Project
Schedule of Capitalization [Line Items]
Term loan												$ 1,012,000,000
Clean Energy Businesses
Schedule of Capitalization [Line Items]
Non-recourse debt								2,076,000,000
Clean Energy Businesses \| Long-term debt due within one year
Schedule of Capitalization [Line Items]
Non-recourse debt								1,965,000,000
Clean Energy Businesses \| Long-term debt
Schedule of Capitalization [Line Items]
Non-recourse debt								$ 111,000,000
Term Loan
Schedule of Capitalization [Line Items]
Face amount of debt					$ 825,000,000
Debt term					2 years
Repayment of debt	$ 150,000,000
Debentures \| 4.125% Debentures Due 2049 \| CECONY
Schedule of Capitalization [Line Items]
Face amount of debt		$ 700,000,000
Interest rate		4.125%
Debentures \| 6.65% 10-Year Debentures \| CECONY
Schedule of Capitalization [Line Items]
Debt term			10 years
Repayment of debt			$ 475,000,000
Interest rate			665.00%
Transition Bond \| O&R
Schedule of Capitalization [Line Items]
Repayment of debt		$ 1,000,000
Secured Debt \| Term Loan Due 2026 \| Con Edison Development
Schedule of Capitalization [Line Items]
Borrowings		$ 464,000,000
Common Stock
Schedule of Capitalization [Line Items]
Number of shares of common stock issued (shares)						5,000,000	6,000,000	10,000,000
Value of common stock issued						$ 1,000,000
Forward Contracts
Schedule of Capitalization [Line Items]
Common stock reserved for issuance (shares)		5,800,000										1,050,000
Share price (dollars per share)		$ 84.83
Forward Contracts \| Common Stock
Schedule of Capitalization [Line Items]
Number of shares of common stock issued (shares)	4,750,000
Value of common stock issued	$ 400,000,000
Scenario, Forecast \| Debentures \| 3.73% Debentures Due 2049 \| O&R
Schedule of Capitalization [Line Items]
Face amount of debt										$ 43,000,000
Interest rate										3.73%
Scenario, Forecast \| Debentures \| 2.94% Debentures Due 2029 \| O&R
Schedule of Capitalization [Line Items]
Face amount of debt									$ 44,000,000
Interest rate									2.94%
Scenario, Forecast \| Debentures \| 3.46% Debentures Due 2039 \| O&R
Schedule of Capitalization [Line Items]
Face amount of debt									$ 38,000,000
Interest rate									3.46%
Subsequent Event \| Senior Notes \| 3.82% Senior Notes Due 2038 \| Con Edison Development
Schedule of Capitalization [Line Items]
Face amount of debt											$ 303,000,000
Interest rate											3.82%

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized debt expense	$ 167	$ 185
Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	19,451	18,145
Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	22,412	18,740
CECONY
Debt Instrument [Line Items]
Unamortized debt discount	141	139
CECONY \| Carrying Amount
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	14,374	14,151
CECONY \| Fair Value
Debt Instrument [Line Items]
Long-Term Debt (including current portion)	$ 17,047	$ 14,685

Short-Term Borrowing (Details) - USD ($)	Sep. 30, 2019	Apr. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 1,300,000,000		$ 1,741,000,000
Loans outstanding under the credit agreement	$ 0		$ 0
Revolving Credit
Short-term Debt [Line Items]
Aggregate commitment		$ 2,200,000,000
Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate	2.30%		3.00%
CECONY
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 930,000,000		$ 1,192,000,000
CECONY \| Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate	2.30%		3.00%

Pension Benefits - Total Periodic Benefit Costs (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	$ 62	$ 72	$ 187	$ 218
Interest cost on projected benefit obligation	150	140	451	420
Expected return on plan assets	(247)	(258)	(741)	(775)
Recognition of net actuarial loss	130	172	389	516
Recognition of prior service cost/(credit)	(4)	(4)	(13)	(13)
TOTAL PERIODIC BENEFIT COST	91	122	273	366
Cost capitalized	(26)	(32)	(80)	(94)
Reconciliation to rate level	(5)	(22)	(12)	(68)
Total expense/(credit) recognized	60	68	181	204
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost – including administrative expenses	58	68	175	204
Interest cost on projected benefit obligation	141	131	423	394
Expected return on plan assets	(234)	(245)	(702)	(734)
Recognition of net actuarial loss	123	163	369	488
Recognition of prior service cost/(credit)	(5)	(5)	(15)	(15)
TOTAL PERIODIC BENEFIT COST	83	112	250	337
Cost capitalized	(24)	(30)	(76)	(89)
Reconciliation to rate level	(4)	(24)	(10)	(74)
Total expense/(credit) recognized	$ 55	$ 58	$ 164	$ 174

Pension Benefits - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
CECONY \| Nonqualified Supplemental Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 15
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	350
Contributions	346
Pension Benefits \| CECONY
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	318
Contributions	$ 315

Other Postretirement Benefits - Periodic Postretirement Benefit Costs (Details) - Other Postretirement Benefits - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 5	$ 13	$ 15
Interest cost on accumulated other postretirement benefit obligation	11	11	33	32
Expected return on plan assets	(16)	(18)	(49)	(55)
Recognition of net actuarial loss/(gain)	(2)	2	(6)	6
Recognition of prior service cost/(credit)	(1)	(2)	(2)	(5)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	(4)	(2)	(11)	(7)
Cost capitalized	(1)	(2)	(6)	(6)
Reconciliation to rate level	3	2	10	6
Total expense/(credit) recognized	(2)	(2)	(7)	(7)
CECONY
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	9	10
Interest cost on accumulated other postretirement benefit obligation	9	9	27	26
Expected return on plan assets	(14)	(16)	(41)	(47)
Recognition of net actuarial loss/(gain)	(2)	1	(7)	2
Recognition of prior service cost/(credit)	0	(1)	(1)	(2)
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST/(CREDIT)	(4)	(4)	(13)	(11)
Cost capitalized	(2)	(1)	(4)	(4)
Reconciliation to rate level	2	2	6	7
Total expense/(credit) recognized	$ (4)	$ (3)	$ (11)	$ (8)

Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Site Contingency [Line Items]
Accrued liabilities	$ 767	$ 779
Regulatory assets	4,242	4,370
Manufactured gas plant sites
Site Contingency [Line Items]
Accrued liabilities	679	689
Other Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	88	90
Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	767	779
Regulatory assets	774	810
CECONY
Site Contingency [Line Items]
Accrued liabilities	684	693
Regulatory assets	3,900	3,987
CECONY \| Manufactured gas plant sites
Site Contingency [Line Items]
Accrued liabilities	596	603
CECONY \| Other Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	88	90
CECONY \| Superfund Sites
Site Contingency [Line Items]
Accrued liabilities	684	693
Regulatory assets	$ 685	$ 716

Environmental Matters - Accrued Liability (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Site Contingency [Line Items]
Regulatory assets	$ 4,242	$ 4,370
Asbestos Suits
Site Contingency [Line Items]
Accrued liability	8	8
Regulatory assets	8	8
Workers’ Compensation
Site Contingency [Line Items]
Accrued liability	79	79
Regulatory assets	5	5
CECONY
Site Contingency [Line Items]
Regulatory assets	3,900	3,987
CECONY \| Asbestos Suits
Site Contingency [Line Items]
Accrued liability	7	7
Regulatory assets	7	7
CECONY \| Workers’ Compensation
Site Contingency [Line Items]
Accrued liability	75	75
Regulatory assets	$ 5	$ 5

Other Material Contingencies - Manhattan Explosion and Fire (Details) $ in Millions		1 Months Ended
	Mar. 12, 2014 building people	Feb. 28, 2017 USD ($)	Sep. 30, 2019 USD ($) lawsuit	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 4,590	$ 4,641
Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability			$ 11	$ 15
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
Number of pending lawsuits \| lawsuit			80
Manhattan Explosion and Fire \| Settlement of Gas Proceedings
Loss Contingencies [Line Items]
Accrued regulatory liability		$ 27

Other Material Contingencies - Guarantees (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 1,954	$ 2,439
Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	573
Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	724
Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	587
Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	70
0 – 3 years
Guarantor Obligations [Line Items]
Total guarantees, by type and term	857
0 – 3 years \| Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	162
0 – 3 years \| Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	501
0 – 3 years \| Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	124
0 – 3 years \| Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	70
4 – 10 years
Guarantor Obligations [Line Items]
Total guarantees, by type and term	449
4 – 10 years \| Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	411
4 – 10 years \| Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	29
4 – 10 years \| Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	9
4 – 10 years \| Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	0
Greater than 10 years
Guarantor Obligations [Line Items]
Total guarantees, by type and term	648
Greater than 10 years \| Con Edison Transmission
Guarantor Obligations [Line Items]
Total guarantees, by type and term	0
Greater than 10 years \| Energy transactions
Guarantor Obligations [Line Items]
Total guarantees, by type and term	194
Greater than 10 years \| Renewable electric production projects
Guarantor Obligations [Line Items]
Total guarantees, by type and term	454
Greater than 10 years \| Other
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 0

Leases - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Leases - Additional Information (Details) $ in Millions	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Assets under finance leases	$ 2	$ 2
Finance leases, accumulated amortization	5	5
Right-of-use asset obtained in exchange for operating lease liability	2	3
CECONY
Lessee, Lease, Description [Line Items]
Assets under finance leases	1	1
Finance leases, accumulated amortization	3	3
Right-of-use asset obtained in exchange for operating lease liability	$ 1	$ 2
Minimum
Lessee, Lease, Description [Line Items]
Lease, term	1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, term	35 years	35 years
Lease, renewal term	5 years	5 years

Leases - Other Related Information (Details)	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	18 years 10 months 24 days
Weighted Average Remaining Lease Term, Finance leases	11 years 2 months 12 days
Weighted Average Discount Rate, Operating leases	4.30%
Weighted Average Discount Rate, Finance leases	3.80%
CECONY
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	14 years 3 months 18 days
Weighted Average Remaining Lease Term, Finance leases	2 years 3 months 18 days
Weighted Average Discount Rate, Operating leases	3.60%
Weighted Average Discount Rate, Finance leases	4.70%

Leases - Future Minimum Lease Payments (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
2020	$ 74
2021	73
2022	69
2023	69
2024	69
All years thereafter	966
Total future minimum lease payments	1,320
Less: imputed interest	(442)
Total	878
Operating lease liabilities (current)	59
Operating lease liabilities (noncurrent)	819
Total	878
Finance Leases
2020	1
2021	0
2022	0
2023	0
2024	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
CECONY
Operating Leases
2020	58
2021	57
2022	53
2023	53
2024	53
All years thereafter	550
Total future minimum lease payments	824
Less: imputed interest	(180)
Total	644
Operating lease liabilities (current)	49
Operating lease liabilities (noncurrent)	595
Total	644
Finance Leases
2020	1
2021	0
2022	0
2023	0
2024	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

Leases - Future Minimum Lease Commitments Under Topic 840 (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
2019	$ 72
2020	72
2021	71
2022	68
2023	68
All years thereafter	890
Total	1,241
CECONY
Operating Leased Assets [Line Items]
2019	56
2020	56
2021	54
2022	53
2023	53
All years thereafter	592
Total	$ 864

Income Tax - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Taxes Disclosure [Line Items]
Income tax expense	$ 116	$ 175	$ 243	$ 330
Re-measurement of deferred tax assets due to TCJA			42
Estimated liability for uncertain tax positions	15		15
Effective income tax rate reconciliation, uncertainty of taxes			12
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate	15		15
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate, net of federal taxes	14		14
CECONY
Income Taxes Disclosure [Line Items]
Income tax expense	119	$ 125	271	$ 274
Estimated liability for uncertain tax positions	$ 4		4
Effective income tax rate reconciliation, uncertainty of taxes			$ 3

Income Tax - Income Tax Reconciliation (Details)	3 Months Ended		9 Months Ended
Income Tax - Income Tax Reconciliation (Details)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax	4.00%	5.00%	4.00%	5.00%
Cost of removal			1.00%	1.00%
Other plant-related items	0.00%	(1.00%)	0.00%	(1.00%)
Renewable energy credits	(1.00%)	(1.00%)	(2.00%)	(1.00%)
TCJA deferred tax re-measurement	0	0.07	0	0.03
Reserve for uncertain tax positions	1.00%	0.00%
Amortization of excess deferred federal income taxes	(3.00%)	(2.00%)	(4.00%)	(3.00%)
Prior period return adjustments	(2.00%)	0.00%
Other	0.00%	(1.00%)	(1.00%)	(1.00%)
Effective tax rate	20.00%	28.00%	19.00%	24.00%
CECONY
STATUTORY TAX RATE
Federal	21.00%	21.00%	21.00%	21.00%
Changes in computed taxes resulting from:
State income tax	5.00%	5.00%	5.00%	5.00%
Cost of removal			1.00%	1.00%
Other plant-related items	0.00%	(1.00%)	(1.00%)	(1.00%)
Renewable energy credits	0.00%	0.00%	0.00%	0.00%
TCJA deferred tax re-measurement	0	0	0	0
Reserve for uncertain tax positions	0.00%	0.00%
Amortization of excess deferred federal income taxes	(3.00%)	(2.00%)	(3.00%)	(3.00%)
Prior period return adjustments	0.00%	0.00%
Other	(1.00%)	(1.00%)	(1.00%)	(1.00%)
Effective tax rate	22.00%	22.00%	22.00%	22.00%

Financial Information by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 3,365	$ 3,328	$ 9,623	$ 9,388
Depreciation and amortization	421	360	1,253	1,061
Operating income/(loss)	867	826	2,111	2,007
Clean Energy Businesses
Segment Reporting Information [Line Items]
Depreciation and amortization	53	18	169	55
Operating income/(loss)	100	25	183	59
Con Edison Transmission
Segment Reporting Information [Line Items]
Depreciation and amortization	0	0	1	1
Operating income/(loss)	(1)	(2)	(5)	(5)
CECONY
Segment Reporting Information [Line Items]
Total revenues	2,877	2,899	8,248	8,121
Depreciation and amortization	346	322	1,020	949
Operating income/(loss)	723	764	1,825	1,850
CECONY \| Electric
Segment Reporting Information [Line Items]
Depreciation and amortization	266	248	785	732
Operating income/(loss)	803	850	1,374	1,421
CECONY \| Gas
Segment Reporting Information [Line Items]
Depreciation and amortization	58	52	168	152
Operating income/(loss)	(24)	(34)	414	369
CECONY \| Steam
Segment Reporting Information [Line Items]
Depreciation and amortization	22	22	67	65
Operating income/(loss)	(56)	(52)	37	60
O&R
Segment Reporting Information [Line Items]
Depreciation and amortization	22	19	63	57
Operating income/(loss)	46	42	113	110
O&R \| Electric
Segment Reporting Information [Line Items]
Depreciation and amortization	16	14	46	41
Operating income/(loss)	56	52	88	79
O&R \| Gas
Segment Reporting Information [Line Items]
Depreciation and amortization	6	5	17	16
Operating income/(loss)	(10)	(10)	25	31
Operating segment
Segment Reporting Information [Line Items]
Total revenues	3,365	3,328	9,623	9,388
Operating segment \| Clean Energy Businesses
Segment Reporting Information [Line Items]
Total revenues	247	181	696	573
Operating segment \| Con Edison Transmission
Segment Reporting Information [Line Items]
Total revenues	1	1	3	3
Operating segment \| CECONY
Segment Reporting Information [Line Items]
Total revenues	2,877	2,899	8,248	8,121
Operating segment \| CECONY \| Electric
Segment Reporting Information [Line Items]
Total revenues	2,544	2,571	6,174	6,107
Operating segment \| CECONY \| Gas
Segment Reporting Information [Line Items]
Total revenues	275	264	1,605	1,540
Operating segment \| CECONY \| Steam
Segment Reporting Information [Line Items]
Total revenues	58	64	469	474
Operating segment \| O&R
Segment Reporting Information [Line Items]
Total revenues	241	246	678	691
Operating segment \| O&R \| Electric
Segment Reporting Information [Line Items]
Total revenues	210	212	493	505
Operating segment \| O&R \| Gas
Segment Reporting Information [Line Items]
Total revenues	31	34	185	186
Other
Segment Reporting Information [Line Items]
Total revenues	(1)	1	(2)	0
Depreciation and amortization	0	1	0	(1)
Operating income/(loss)	(1)	(3)	(5)	(7)
Inter-segment \| CECONY
Segment Reporting Information [Line Items]
Total revenues	(24)	(25)	(71)	(74)
Inter-segment \| CECONY \| Electric
Segment Reporting Information [Line Items]
Total revenues	4	4	13	12
Inter-segment \| CECONY \| Gas
Segment Reporting Information [Line Items]
Total revenues	2	2	6	6
Inter-segment \| CECONY \| Steam
Segment Reporting Information [Line Items]
Total revenues	$ 18	$ 19	$ 52	$ 56

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	$ 503	$ 446
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(219)	(66)
Net fair value derivative assets/(liabilities)
Gross Amounts of Recognized Assets/(Liabilities)	(187)	(27)
Gross Amounts Offset	11	(1)
Net Amounts of Assets/ (Liabilities)	(176)	(28)
Margin deposits	7	7
Interest Rate Swap
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	0	2
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(64)	(6)
CECONY
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)	456	407
Net fair value derivative assets/(liabilities)
Gross Amounts of Recognized Assets/(Liabilities)	(103)	(7)
Gross Amounts Offset	11	1
Net Amounts of Assets/ (Liabilities)	(92)	(6)
Margin deposits	6	6
Clean Energy Businesses \| Interest Rate Swap
Net fair value derivative assets/(liabilities)
Notional amount	934	499
Fair Value of Derivative Liabilities, Current
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(89)	(61)
Gross Amounts Offset	17	11
Net Amounts of Assets/ (Liabilities)	(72)	(50)
Fair Value of Derivative Liabilities, Current \| Interest Rate Swap
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(7)
Fair Value of Derivative Liabilities, Current \| CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(61)	(31)
Gross Amounts Offset	28	6
Net Amounts of Assets/ (Liabilities)	(33)	(25)
Fair Value of Derivative Liabilities, Noncurrent
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(156)	(25)
Gross Amounts Offset	9	9
Net Amounts of Assets/ (Liabilities)	(147)	(16)
Fair Value of Derivative Liabilities, Noncurrent \| Interest Rate Swap
Fair value of derivative liabilities
Net Amounts of Assets/ (Liabilities)	(57)	(6)
Fair Value of Derivative Liabilities, Noncurrent \| CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(90)	(12)
Gross Amounts Offset	8	6
Net Amounts of Assets/ (Liabilities)	(82)	(6)
Fair Value of Derivative Liabilities
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(245)	(86)
Gross Amounts Offset	26	20
Net Amounts of Assets/ (Liabilities)	(219)	(66)
Fair Value of Derivative Liabilities \| CECONY
Fair value of derivative liabilities
Gross Amounts of Recognized Assets/(Liabilities)	(151)	(43)
Gross Amounts Offset	36	12
Net Amounts of Assets/ (Liabilities)	(115)	(31)
Fair Value of Derivative Assets, Current
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	51	43
Gross Amounts Offset	(8)	(14)
Net Amounts of Assets/ (Liabilities)	43	29
Fair Value of Derivative Assets, Current \| CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	42	25
Gross Amounts Offset	(19)	(6)
Net Amounts of Assets/ (Liabilities)	23	19
Fair Value of Derivative Assets, Noncurrent
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	7	16
Gross Amounts Offset	(7)	(7)
Net Amounts of Assets/ (Liabilities)	0	9
Fair Value of Derivative Assets, Noncurrent \| Interest Rate Swap
Fair value of derivative assets
Net Amounts of Assets/ (Liabilities)		2
Fair Value of Derivative Assets, Noncurrent \| CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	6	11
Gross Amounts Offset	(6)	(5)
Net Amounts of Assets/ (Liabilities)	0	6
Fair Value of Derivative Assets
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	58	59
Gross Amounts Offset	(15)	(21)
Net Amounts of Assets/ (Liabilities)	43	38
Fair Value of Derivative Assets \| CECONY
Fair value of derivative assets
Gross Amounts of Recognized Assets/(Liabilities)	48	36
Gross Amounts Offset	(25)	(11)
Net Amounts of Assets/ (Liabilities)	$ 23	$ 25

Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ 15	$ 6	$ (5)	$ (6)
Total deferred gains/(losses)	(11)	36	(208)	31
Net deferred gains/(losses)	4	42	(213)	25
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(21)	(7)	(42)	(8)
Gas purchased for resale
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	1	0	(2)	(1)
Non-utility revenue
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	5	(7)	20	(7)
Other interest expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(26)	0	(60)	0
Other operations and maintenance expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(1)	0
Deferred Derivative Gains, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	15	6	3	(11)
Deferred Derivative Gains, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	0	0	(8)	5
Deferred Derivative Losses, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	6	25	(32)	21
Recoverable Energy Costs, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(35)	(4)	(94)	(13)
Deferred Derivative Losses, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	18	15	(82)	23
CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	15	8	(2)	(6)
Total deferred gains/(losses)	(10)	33	(189)	30
Net deferred gains/(losses)	5	41	(191)	24
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(1)	0	0	0
CECONY \| Gas purchased for resale
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY \| Non-utility revenue
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY \| Other interest expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	0	0	0	0
CECONY \| Other operations and maintenance expense
Pre-tax gains/(losses) recognized in income
Total pre-tax gains/(losses) recognized in income	(1)
CECONY \| Deferred Derivative Gains, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	15	6	3	(10)
CECONY \| Deferred Derivative Gains, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	0	2	(5)	4
CECONY \| Deferred Derivative Losses, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	6	25	(28)	23
CECONY \| Recoverable Energy Costs, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(32)	(6)	(82)	(14)
CECONY \| Deferred Derivative Losses, Noncurrent
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ 16	$ 14	$ (79)	$ 21

Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 154
Makeup of net credit exposure non-investment grade/non-rated counterparties	50
Makeup of net credit exposure independent system operators	58
Makeup of net credit exposure with investment-grade counterparties	35
Makeup of net credit exposure with commodity exchange brokers	11
CECONY
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	6
Makeup of net credit exposure with commodity exchange brokers	$ 6

Derivative Instruments and Hedging Activities - Credit-Risk-Related Contingent Features (Details) $ in Millions	Sep. 30, 2019 USD ($)
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	$ 112
Collateral posted	26
Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	18
Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	123
Derivatives in net asset position additional collateral	26
CECONY
Derivatives, Fair Value [Line Items]
Aggregate fair value – net liabilities	95
Collateral posted	20
CECONY \| Downgrade One Level from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	14
CECONY \| Downgrade to Below Investment Grade from Current Ratings
Derivatives, Fair Value [Line Items]
Additional collateral	$ 92

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 503		$ 446
Derivative liabilities	219		66
Transfer out of level 3	0	$ 1
CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	456		407
Transfer out of level 3	0	$ 1
Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11		(6)
Derivative liabilities	(7)		(11)
Netting Adjustment \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		(1)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	334		293
Derivative liabilities	18		8
Level 1 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	313		270
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	156		152
Derivative liabilities	162		49
Level 2 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	142		137
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		7
Derivative liabilities	46		20
Level 3 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1		1
Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	50		43
Derivative liabilities	155		60
Transfer out of level 3			2
Commodity \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	29		31
Derivative liabilities	115		32
Transfer out of level 3			2
Commodity \| Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11		(6)
Derivative liabilities	(7)		(11)
Commodity \| Netting Adjustment \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		(1)
Derivative liabilities	(19)		(6)
Commodity \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4		6
Derivative liabilities	18		8
Commodity \| Level 1 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3		3
Derivative liabilities	15		5
Commodity \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	33		36
Derivative liabilities	98		43
Commodity \| Level 2 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	25		28
Derivative liabilities	87		30
Commodity \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2		7
Derivative liabilities	46		20
Commodity \| Level 3 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1		1
Derivative liabilities	32		3
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		2
Derivative liabilities	64		6
Interest rate swap \| Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Interest rate swap \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Interest rate swap \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		2
Derivative liabilities	64		6
Interest rate swap \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Derivative liabilities	0		0
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	453		401
Other \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	427		376
Other \| Netting Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Other \| Netting Adjustment \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Other \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	330		287
Other \| Level 1 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	310		267
Other \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	123		114
Other \| Level 2 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	117		109
Other \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Other \| Level 3 \| CECONY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 0		$ 0

Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Level 3 Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (46)	$ (4)	$ (13)	$ 1	$ 1
Included in earnings	4	4	(2)	4
Included in regulatory assets and liabilities	(1)	(4)	(32)	(7)
Settlements	(1)	(6)	3	(9)
Transfer out of level 3			0	1
Ending balance	(44)	(10)	(44)	(10)	(13)
CECONY
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(30)	0	(2)	4	4
Included in earnings	1	2	1	4
Included in regulatory assets and liabilities	(1)	0	(29)	(5)
Settlements	(1)	(2)	(1)	(4)
Transfer out of level 3			0	1
Ending balance	$ (31)	$ 0	$ (31)	$ 0	$ (2)

Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 MW
Texas Solar 4
Variable Interest Entity [Line Items]
Generating capacity (MW AC) \| MW			40
Tax Equity Projects
Variable Interest Entity [Line Items]
Net income (loss)	$ (13)	$ (47)
Income (loss) before tax	$ (10)	$ (36)
Con Edison Development \| Texas Solar 4
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)			80.00%
Ownership percentage acquired	20.00%	20.00%
Con Edison Development \| Tax Equity Projects
Variable Interest Entity [Line Items]
Percentage of variable interests (less than)			100.00%
Tax Equity Investors \| Tax Equity Projects
Variable Interest Entity [Line Items]
Net income (loss)	$ 30	$ 79
Income (loss) before tax	$ 23	$ 60

Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 175	$ 113
Great Valley Solar
Variable Interest Entity [Line Items]
Restricted cash	0	0
Non-utility property, less accumulated depreciation	295	313
Other assets	47	18
Total assets	342	331
Long-term debt due within one year	0	0
Other liabilities	19	17
Long-term debt	0	0
Total liabilities	19	17
Accumulated depreciation	7	1
Great Valley Solar \| Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	57	33
Copper Mountain - Mesquite Solar
Variable Interest Entity [Line Items]
Restricted cash	0	0
Non-utility property, less accumulated depreciation	465	492
Other assets	131	97
Total assets	596	589
Long-term debt due within one year	0	0
Other liabilities	22	33
Long-term debt	0	0
Total liabilities	22	33
Accumulated depreciation	10	1
Copper Mountain - Mesquite Solar \| Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 115	71
Texas Solar 4
Variable Interest Entity [Line Items]
Restricted cash		4
Non-utility property, less accumulated depreciation		98
Other assets		9
Total assets		111
Long-term debt due within one year		2
Other liabilities		26
Long-term debt		56
Total liabilities		84
Accumulated depreciation		15
Texas Solar 4 \| Third Party
Variable Interest Entity [Line Items]
Noncontrolling interest		$ 7

Consolidated Statement of Equity/Shareholder's Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share (dollars per share)	$ 0.74	$ 0.74	$ 0.74	$ 0.715	$ 0.715	$ 0.715	$ 0.715

General (Details)	9 Months Ended
General (Details)	Sep. 30, 2019 subsidiary registrant
Accounting Policies [Abstract]
Number of registrants \| registrant	2
Number of regulated utility subsidiaries	2
Clean Energy Businesses
Investment [Line Items]
Number of subsidiaries	3

Summary of Significant Accounting Policies and Other Matters - Acquisitions and Investments (Details) - Sempra Solar Holdings, LLC - Con Edison Development $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Purchase price adjustment, reclassification, decrease in property, plant and equipment	$ 100
Purchase price adjustment, reclassification, decrease in asset retirement obligations	$ 100

Environmental Matters - Additional Information (Details) - USD ($) $ in Billions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
CECONY \| Asbestos Proceedings
Site Contingency [Line Items]
Estimated undiscounted asbestos liability (years)	15 years
Superfund Sites \| Manufactured Gas Plant Sites \| Maximum
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)		$ 2.8
Superfund Sites \| Manufactured Gas Plant Sites \| Maximum \| CECONY
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)		$ 2.6

Short-Term Borrowing	9 Months Ended
Short-Term Borrowing	Sep. 30, 2019
Debt Disclosure [Abstract]
Short-Term Borrowing	Short-Term Borrowing At September 30, 2019, Con Edison had $1,300 million of commercial paper outstanding of which $930 million was outstanding under CECONY’s program. The weighted average interest rate at September 30, 2019 was 2.3 percent for both Con Edison and CECONY. At December 31, 2018, Con Edison had $1,741 million of commercial paper outstanding of which $1,192 million was outstanding under CECONY’s program. The weighted average interest rate at December 31, 2018 was 3.0 percent for both Con Edison and CECONY. At September 30, 2019 and December 31, 2018, no loans were outstanding under the Companies' December 2016 credit agreement (Credit Agreement). An immaterial amount of letters of credit were outstanding under the Credit Agreement as of September 30, 2019 and December 31, 2018. In April 2019, the termination date of the Credit Agreement was extended from December 2022 to December 2023 with respect to banks with aggregate commitments of $2,200 million.

Other Postretirement Benefits - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 7

Other Material Contingencies - Manhattan Steam Main Rupture (Details) $ in Millions	Sep. 30, 2019 USD ($)
Property Damage, Clean Up and Other Response Costs Related with Manhattan Steam Main Rupture
Loss Contingencies [Line Items]
Loss contingency	$ 16
Capital, Retirement and Other Costs Related with Manhattan Steam Main Rupture
Loss Contingencies [Line Items]
Loss contingency	$ 10

Other Material Contingencies - Other (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 1,954	$ 2,439
Financial Guarantee for Indemnity Agreements for Surety Bonds
Guarantor Obligations [Line Items]
Guarantee obligations maximum exposure	$ 70

Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Sep. 30, 2019 MW gal MWh MMBTU
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount \| MWh	27,843,993
Capacity
Derivatives, Fair Value [Line Items]
Notional amount \| MW	25,054
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount \| MMBTU	277,395,718
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount \| gal	6,720,000
CECONY \| Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount \| MWh	25,361,275
CECONY \| Capacity
Derivatives, Fair Value [Line Items]
Notional amount \| MW	16,800
CECONY \| Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount \| MMBTU	260,350,000
CECONY \| Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount \| gal	6,720,000

Fair Value Measurements - Schedule of Commodity Derivatives (Details) $ in Millions	Sep. 30, 2019 USD ($) $ / kW-month $ / MWh $ / Dt	Dec. 31, 2018 USD ($)
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 503	$ 446
CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	456	407
Level 3
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	2	7
Level 3 \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	1	$ 1
Level 3 \| Electricity \| Forward energy prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (26)
Level 3 \| Electricity \| Forward energy prices \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	16.20
Level 3 \| Electricity \| Forward energy prices \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	71.77
Level 3 \| Electricity \| Forward energy prices \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (24)
Level 3 \| Electricity \| Forward energy prices \| CECONY \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	23.40
Level 3 \| Electricity \| Forward energy prices \| CECONY \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	71.77
Level 3 \| Electricity \| Forward capacity prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (18)
Level 3 \| Electricity \| Forward capacity prices \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / kW-month	0.45
Level 3 \| Electricity \| Forward capacity prices \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / kW-month	7.75
Level 3 \| Electricity \| Forward capacity prices \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (8)
Level 3 \| Electricity \| Forward capacity prices \| CECONY \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / kW-month	0.45
Level 3 \| Electricity \| Forward capacity prices \| CECONY \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / kW-month	7.75
Level 3 \| Natural Gas \| Forward natural gas prices
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (1)
Level 3 \| Natural Gas \| Forward natural gas prices \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / Dt	0.97
Level 3 \| Natural Gas \| Forward natural gas prices \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / Dt	2.43
Level 3 \| Transmission Congestion Contracts/Financial Transmission Rights \| Inter-zonal forward price curves adjusted for historical zonal losses
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 1
Level 3 \| Transmission Congestion Contracts/Financial Transmission Rights \| Inter-zonal forward price curves adjusted for historical zonal losses \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	(1.00)
Level 3 \| Transmission Congestion Contracts/Financial Transmission Rights \| Inter-zonal forward price curves adjusted for historical zonal losses \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	7.03
Level 3 \| Transmission Congestion Contracts \| Inter-zonal forward price curves adjusted for historical zonal losses \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 1
Level 3 \| Transmission Congestion Contracts \| Inter-zonal forward price curves adjusted for historical zonal losses \| CECONY \| Minimum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	0.35
Level 3 \| Transmission Congestion Contracts \| Inter-zonal forward price curves adjusted for historical zonal losses \| CECONY \| Maximum
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range (dollar per unit) \| $ / MWh	4.11
Level 3 \| Commodity
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (44)
Level 3 \| Commodity \| CECONY
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ (31)

For the Three Months Ended September 30, 2019

(Millions of Dollars)

Con Edison

Operating lease cost

Operating lease cash flows