Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2014	May 02, 2014
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Trading Symbol	ED
Entity Registrant Name	CONSOLIDATED EDISON INC
Entity Central Index Key	0001047862
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		292,894,192
CECONY [Member]
Document Information [Line Items]
Entity Registrant Name	CONSOLIDATED EDISON CO OF NEW YORK INC
Entity Central Index Key	0000023632
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

Consolidated Income Statement (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING REVENUES
Electric	$ 2,237	$ 1,958
Gas	882	742
Steam	341	332
Non-utility	329	152
TOTAL OPERATING REVENUES	3,789	3,184
OPERATING EXPENSES
Purchased power	963	707
Fuel	156	147
Gas purchased for resale	400	250
Other operations and maintenance	825	830
Depreciation and amortization	261	251
Taxes, other than income taxes	499	473
TOTAL OPERATING EXPENSES	3,104	2,658
OPERATING INCOME	685	526
OTHER INCOME (DEDUCTIONS)
Investment and other income	12	4
Allowance for equity funds used during construction	1	1
Other deductions	(3)	(3)
TOTAL OTHER INCOME	10	2
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	695	528
INTEREST EXPENSE
Interest on long-term debt	146	143
Other interest	(9)	136
Allowance for borrowed funds used during construction	(1)
NET INTEREST EXPENSE	136	279
INCOME BEFORE INCOME TAX EXPENSE	559	249
INCOME TAX EXPENSE	198	57
NET INCOME FOR COMMON STOCK	361	192
Net income for common stock per common share-basic	$ 1.23	$ 0.66
Net income for common stock per common share-diluted	$ 1.23	$ 0.65
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 0.630	$ 0.615
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (IN MILLIONS)	292.9	292.9
AVERAGE NUMBER OF SHARES OUTSTANDING-DILUTED (IN MILLIONS)	294.1	294.2
CECONY [Member]
OPERATING REVENUES
Electric	2,074	1,814
Gas	789	660
Steam	341	332
TOTAL OPERATING REVENUES	3,204	2,806
OPERATING EXPENSES
Purchased power	617	455
Fuel	156	147
Gas purchased for resale	346	219
Other operations and maintenance	725	741
Depreciation and amortization	240	233
Taxes, other than income taxes	477	451
TOTAL OPERATING EXPENSES	2,561	2,246
OPERATING INCOME	643	560
OTHER INCOME (DEDUCTIONS)
Investment and other income	7	3
Allowance for equity funds used during construction	1
Other deductions	(2)	(2)
TOTAL OTHER INCOME	6	1
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	649	561
INTEREST EXPENSE
Interest on long-term debt	128	127
Other interest	3	5
NET INTEREST EXPENSE	131	132
INCOME BEFORE INCOME TAX EXPENSE	518	429
INCOME TAX EXPENSE	184	152
NET INCOME FOR COMMON STOCK	$ 334	$ 277

Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
NET INCOME	$ 361	$ 192
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension plan liability adjustments, net	4	3
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	4	3
COMPREHENSIVE INCOME FOR COMMON STOCK	365	195
CECONY [Member]
NET INCOME	334	277
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Pension plan liability adjustments, net	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1
COMPREHENSIVE INCOME	$ 335	$ 277

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

+ References

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+ Details

Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING ACTIVITIES
NET INCOME	$ 361	$ 192
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	261	251
Deferred income taxes	195	(87)
Rate case amortization and accruals	32	10
Common equity component of allowance for funds used during construction	(1)	(1)
Net derivative gains	(20)	(45)
Other non-cash items (net)	4	192
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	(315)	(135)
Special deposits	324	(438)
Materials and supplies, including fuel oil and gas in storage	60	60
Other receivables and other current assets	8	85
Prepayments	(353)	(263)
Accounts payable	113	(84)
Pensions and retiree benefits obligations	193	250
Pensions and retiree benefits contributions	(200)	(235)
Accrued taxes	(378)	(18)
Accrued interest	(39)	174
Superfund and environmental remediation costs (net)	9
Deferred charges, noncurrent assets and other regulatory assets	(103)	12
Deferred credits and other regulatory liabilities	86	(5)
Other assets	27	10
Other liabilities	(40)	(9)
NET CASH FLOWS FROM/(USED IN) OPERATING ACTIVITIES	224	(84)
INVESTING ACTIVITIES
Utility construction expenditures	(498)	(538)
Cost of removal less salvage	(47)	(47)
Non-utility construction expenditures	(61)	(91)
Investments in solar energy projects	(80)
Proceeds from grants related to solar energy projects	36	13
Increase in restricted cash	16
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(634)	(663)
FINANCING ACTIVITIES
Net proceeds of short-term debt	(621)	482
Issuance of long-term debt	850	700
Retirement of long-term debt	(200)	(509)
Debt issuance costs	(6)	(7)
Common stock dividends	(184)	(180)
Issuance of common shares for stock plans, net of repurchases	(1)	(1)
NET CASH FLOWS FROM/(USED IN) FINANCING ACTIVITIES	(162)	485
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(572)	(262)
BALANCE AT BEGINNING OF PERIOD	674	394
BALANCE AT END OF PERIOD	102	132
Cash paid during the period for:
Interest	91	90
Income taxes	416	24
CECONY [Member]
OPERATING ACTIVITIES
NET INCOME	334	277
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	240	233
Deferred income taxes	178	241
Rate case amortization and accruals	32	10
Common equity component of allowance for funds used during construction	(1)
Other non-cash items (net)	2	(10)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	(265)	(102)
Materials and supplies, including fuel oil and gas in storage	46	49
Other receivables and other current assets	(49)	(15)
Prepayments	(295)	(310)
Accounts payable	12	(58)
Pensions and retiree benefits obligations	184	239
Pensions and retiree benefits contributions	(200)	(235)
Accrued taxes	(214)	(79)
Accrued interest	40	46
Superfund and environmental remediation costs (net)	9
Deferred charges, noncurrent assets and other regulatory assets	(115)	39
Deferred credits and other regulatory liabilities	105	(14)
Other liabilities	(32)	39
NET CASH FLOWS FROM/(USED IN) OPERATING ACTIVITIES	11	350
INVESTING ACTIVITIES
Utility construction expenditures	(464)	(515)
Cost of removal less salvage	(46)	(47)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(510)	(562)
FINANCING ACTIVITIES
Net proceeds of short-term debt	(541)	(108)
Issuance of long-term debt	850	700
Retirement of long-term debt	(200)	(505)
Debt issuance costs	(6)	(7)
Dividend to parent	(178)	(182)
NET CASH FLOWS FROM/(USED IN) FINANCING ACTIVITIES	(75)	(102)
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(574)	(314)
BALANCE AT BEGINNING OF PERIOD	633	353
BALANCE AT END OF PERIOD	59	39
Cash paid during the period for:
Interest	85	84
Income taxes	$ 276	$ 45

Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
OTHER NONCURRENT ASSETS
Goodwill	$ 429	$ 429
Intangible assets, less accumulated amortization of $4 in 2014 and 2013.	4	4
Regulatory assets	7,082	7,201
Other deferred charges and noncurrent assets	253	225
TOTAL OTHER NONCURRENT ASSETS	7,768	7,859
TOTAL ASSETS	40,481	40,647
CURRENT ASSETS
Cash and temporary cash investments	102	674
Special deposits	3	327
Accounts receivable - customers, less allowance for uncollectible accounts	1,566	1,251
Other receivables, less allowance for uncollectible accounts	210	240
Accrued unbilled revenue	456	514
Fuel oil, gas in storage, materials and supplies, at average cost	303	363
Prepayments	489	136
Regulatory assets	8	29
Deferred tax assets - current	82	122
Other current assets	265	235
TOTAL CURRENT ASSETS	3,484	3,891
INVESTMENTS	547	461
UTILITY PLANT, AT ORIGINAL COST
General	2,394	2,336
TOTAL	34,212	33,474
Less: Accumulated depreciation	7,208	7,072
Net	27,004	26,402
Construction work in progress	1,076	1,393
NET UTILITY PLANT	28,080	27,795
NON-UTILITY PROPERTY
Non-utility property, less accumulated depreciation	534	605
Construction work in progress	68	36
NET PLANT	28,682	28,436
CURRENT LIABILITIES
Long-term debt due within one year	285	485
Notes payable	830	1,451
Accounts payable	1,079	1,017
Customer deposits	326	321
Accrued taxes	98	476
Accrued interest	210	249
Accrued wages	97	92
Fair value of derivative liabilities	4	13
Regulatory liabilities	243	148
Other current liabilities	404	478
TOTAL CURRENT LIABILITIES	3,576	4,730
NONCURRENT LIABILITIES
Obligations under capital leases	1	1
Provision for injuries and damages	198	195
Pensions and retiree benefits	1,502	1,727
Superfund and other environmental costs	741	749
Asset retirement obligations	144	143
Fair value of derivative liabilities	4	5
Deferred income taxes and investment tax credits	8,564	8,466
Regulatory liabilities	1,800	1,728
Other deferred credits and noncurrent liabilities	187	169
TOTAL NONCURRENT LIABILITIES	13,141	13,183
LONG-TERM DEBT	11,338	10,489
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	12,426	12,245
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	40,481	40,647
CECONY [Member]
OTHER NONCURRENT ASSETS
Regulatory assets	6,522	6,639
Other deferred charges and noncurrent assets	168	146
TOTAL OTHER NONCURRENT ASSETS	6,690	6,785
TOTAL ASSETS	36,326	36,258
CURRENT ASSETS
Cash and temporary cash investments	59	633
Special deposits	2	86
Accounts receivable - customers, less allowance for uncollectible accounts	1,388	1,123
Other receivables, less allowance for uncollectible accounts	112	127
Accrued unbilled revenue	336	405
Accounts receivable from affiliated companies	289	119
Fuel oil, gas in storage, materials and supplies, at average cost	254	300
Prepayments	397	102
Regulatory assets	5	26
Deferred tax assets - current	61	100
Other current assets	66	55
TOTAL CURRENT ASSETS	2,969	3,076
INVESTMENTS	250	247
UTILITY PLANT, AT ORIGINAL COST
General	2,208	2,154
TOTAL	32,022	31,312
Less: Accumulated depreciation	6,595	6,469
Net	25,427	24,843
Construction work in progress	986	1,303
NET UTILITY PLANT	26,413	26,146
NON-UTILITY PROPERTY
Non-utility property, less accumulated depreciation	4	4
NET PLANT	26,417	26,150
CURRENT LIABILITIES
Long-term debt due within one year	275	475
Notes payable	669	1,210
Accounts payable	840	824
Accounts payable to affiliated companies	22	45
Customer deposits	314	308
Accrued taxes	35	46
Accrued taxes to affiliated companies	210	413
Accrued interest	179	139
Accrued wages	88	82
Fair value of derivative liabilities	1	12
Regulatory liabilities	199	107
Other current liabilities	344	385
TOTAL CURRENT LIABILITIES	3,176	4,046
NONCURRENT LIABILITIES
Obligations under capital leases	1	1
Provision for injuries and damages	183	180
Pensions and retiree benefits	1,237	1,453
Superfund and other environmental costs	637	644
Asset retirement obligations	144	143
Fair value of derivative liabilities	2	3
Deferred income taxes and investment tax credits	7,942	7,832
Regulatory liabilities	1,647	1,598
Other deferred credits and noncurrent liabilities	137	145
TOTAL NONCURRENT LIABILITIES	11,930	11,999
LONG-TERM DEBT	10,216	9,366
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	11,004	10,847
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	36,326	36,258
Electric [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	23,955	23,450
Electric [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	22,556	22,073
Gas [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	5,661	5,494
Gas [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	5,056	4,891
Steam [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,202	2,194
Steam [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,202	$ 2,194

Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts receivable - customers, allowance for uncollectible accounts	$ 96	$ 93
Other receivables, allowance for uncollectible accounts	10	10
Non-utility property, accumulated depreciation	97	90
Intangible assets, accumulated amortization	4	4
CECONY [Member]
Accounts receivable - customers, allowance for uncollectible accounts	90	87
Other receivables, allowance for uncollectible accounts	9	8
Non-utility property, accumulated depreciation	$ 25	$ 25

Consolidated Statement of Common Shareholders' Equity (USD $) In Millions, except Share data	Total	CECONY [Member]	Common Stock [Member]	Common Stock [Member] CECONY [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] CECONY [Member]	Retained Earnings [Member]	Retained Earnings [Member] CECONY [Member]	Treasury Stock [Member]	Capital Stock Expense [Member]	Capital Stock Expense [Member] CECONY [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Accumulated Other Comprehensive Income/(Loss) [Member] CECONY [Member]	Repurchased Con Edison Stock [Member] CECONY [Member]
BALANCE at Dec. 31, 2012	$ 11,869	$ 10,552	$ 32	$ 589	$ 4,991	$ 4,234	$ 7,997	$ 6,761	$ (1,037)	$ (61)	$ (61)	$ (53)	$ (9)	$ (962)
BALANCE (In Shares) at Dec. 31, 2012			292,871,896	235,488,094					23,210,700
Net income for common stock	192	277					192
NET INCOME	192	277						277
Common stock dividend to parent	(180)	(182)					(180)	(182)
Issuance of common shares for stock plans, net of repurchases	5				(2)				7
Issuance of common shares for stock plans, net of repurchases (In Shares)			95,468
Issuance of common shares for stock plans, repurchases (In Shares)									(95,468)
Other comprehensive income	3											3
BALANCE at Mar. 31, 2013	11,889	10,647	32	589	4,989	4,234	8,009	6,856	(1,030)	(61)	(61)	(50)	(9)	(962)
BALANCE (In Shares) at Mar. 31, 2013			292,967,364	235,488,094					23,115,232
BALANCE at Dec. 31, 2013	12,245	10,847	32	589	4,995	4,234	8,338	7,053	(1,034)	(61)	(61)	(25)	(6)	(962)
BALANCE (In Shares) at Dec. 31, 2013			292,872,396	235,488,094					23,210,200
Net income for common stock	361	334					361
NET INCOME	361	334						334
Common stock dividend to parent	(184)	(178)					(184)	(178)
Issuance of common shares for stock plans, net of repurchases					(2)				2
Issuance of common shares for stock plans, net of repurchases (In Shares)			51,656
Issuance of common shares for stock plans, repurchases (In Shares)									(51,656)
Other comprehensive income	4	1										4	1
BALANCE at Mar. 31, 2014	$ 12,426	$ 11,004	$ 32	$ 589	$ 4,993	$ 4,234	$ 8,515	$ 7,209	$ (1,032)	$ (61)	$ (61)	$ (21)	$ (5)	$ (962)
BALANCE (In Shares) at Mar. 31, 2014			292,924,052	235,488,094					23,158,544

- Definition

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

+ References

+ Details

General	3 Months Ended
General	Mar. 31, 2014
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 Con Edison’s other utility subsidiary, Orange and Rockland Utilities, Inc. (O&R), and Con Edison’s competitive energy businesses (discussed below) 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, 2013. Certain prior period amounts have been reclassified to conform to the current period presentation. 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 subsidiaries, provides electric service in southeastern New York and adjacent areas of northern New Jersey and eastern Pennsylvania and gas service in southeastern New York and adjacent areas of eastern Pennsylvania. Con Edison has the following competitive energy businesses: Consolidated Edison Solutions, Inc. (Con Edison Solutions), a company which sells to retail customers electricity purchased in wholesale markets and enters into related hedging transactions and also provides energy-related products and services to retail customers; Consolidated Edison Energy, Inc. (Con Edison Energy), a company that provides energy-related products and services to wholesale customers; and Consolidated Edison Development, Inc. (Con Edison Development), a company that participates in infrastructure projects.
CECONY [Member]
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 Con Edison’s other utility subsidiary, Orange and Rockland Utilities, Inc. (O&R), and Con Edison’s competitive energy businesses (discussed below) 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, 2013. Certain prior period amounts have been reclassified to conform to the current period presentation. 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 subsidiaries, provides electric service in southeastern New York and adjacent areas of northern New Jersey and eastern Pennsylvania and gas service in southeastern New York and adjacent areas of eastern Pennsylvania. Con Edison has the following competitive energy businesses: Consolidated Edison Solutions, Inc. (Con Edison Solutions), a company which sells to retail customers electricity purchased in wholesale markets and enters into related hedging transactions and also provides energy-related products and services to retail customers; Consolidated Edison Energy, Inc. (Con Edison Energy), a company that provides energy-related products and services to wholesale customers; and Consolidated Edison Development, Inc. (Con Edison Development), a company that participates in infrastructure projects.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2014

Summary of Significant Accounting Policies

Note A — Summary of Significant Accounting Policies

Earnings Per Common Share

For the three months ended March 31, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


*(Millions of Dollars, except per share amounts/Shares in Millions)*	2014		2013
Net income for common stock	$	361	$	192
Weighted average common shares outstanding – basic		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.2		1.3
Adjusted weighted average common shares outstanding – diluted		294.1		294.2
Net Income for common stock per common share – basic	$	1.23	$	0.66
Net Income for common stock per common share – diluted	$	1.23	$	0.65

The computation of diluted EPS for the three months ended March 31, 2014 excludes immaterial amounts of performance share awards which were not included because of their anti-dilutive effect. No such exclusions were required for the computation of diluted EPS for the three months ended March 31, 2013.

Changes in Accumulated Other Comprehensive Income by Component

For the three months ended March 31, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


	Three Months Ended March 31,
	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Beginning balance, accumulated OCI, net of taxes	$	(25	)	$	(53	)	$	(6	)	$	(9	)
OCI before reclassifications, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively		2			1			—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY ^(a)(b)		2			2			1			—
Current period total OCI, net of taxes	$	4		$	3		$	1		$	—
Ending balance, accumulated OCI, net of taxes ^(b)	$	(21	)	$	(50	)	$	(5	)	$	(9	)

(a)

For the portion of unrecognized pension and other postretirement benefit costs relating to the regulated 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 net periodic pension and other postretirement benefit cost. See Notes E and F.

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

CECONY [Member]

Summary of Significant Accounting Policies

Note A — Summary of Significant Accounting Policies

Earnings Per Common Share

For the three months ended March 31, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


*(Millions of Dollars, except per share amounts/Shares in Millions)*	2014		2013
Net income for common stock	$	361	$	192
Weighted average common shares outstanding – basic		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.2		1.3
Adjusted weighted average common shares outstanding – diluted		294.1		294.2
Net Income for common stock per common share – basic	$	1.23	$	0.66
Net Income for common stock per common share – diluted	$	1.23	$	0.65

Changes in Accumulated Other Comprehensive Income by Component

For the three months ended March 31, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


	Three Months Ended March 31,
	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Beginning balance, accumulated OCI, net of taxes	$	(25	)	$	(53	)	$	(6	)	$	(9	)
OCI before reclassifications, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively		2			1			—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY ^(a)(b)		2			2			1			—
Current period total OCI, net of taxes	$	4		$	3		$	1		$	—
Ending balance, accumulated OCI, net of taxes ^(b)	$	(21	)	$	(50	)	$	(5	)	$	(9	)

(a)

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

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

+ References+ Details

Regulatory Matters

3 Months Ended

Mar. 31, 2014

Regulatory Matters

Note B — Regulatory Matters

Other Regulatory Matters

In February 2009, the New York State Public Service Commission (NYSPSC) commenced a proceeding to examine the prudence of certain CECONY expenditures following the arrests of employees for accepting illegal payments from a construction contractor. Subsequently, additional employees were arrested for accepting illegal payments from materials suppliers and an engineering firm. The arrested employees were terminated by the company and have pled guilty or been convicted. Pursuant to NYSPSC orders, a portion of the company’s revenues (currently, $249 million, $32 million and $6 million on an annual basis for electric, gas and steam service, respectively) is being collected subject to potential refund to customers. The amount of electric revenues collected subject to refund, which was established in a different proceeding, and the amount of gas and steam revenues collected subject to refund were not established as indicative of the company’s potential liability in this proceeding. At March 31, 2014, the company had collected an estimated $1,462 million from customers subject to potential refund in connection with this proceeding. In January 2013, a NYSPSC consultant reported its estimate, with which the company does not agree, of $208 million of overcharges with respect to a substantial portion of the company’s construction expenditures from January 2000 to January 2009. The company is disputing the consultant’s estimate, including its determinations as to overcharges regarding specific construction expenditures it selected to review and its methodology of extrapolating such determinations over a substantial portion of the construction expenditures during this period. The NYSPSC’s consultant has not reviewed the company’s other expenditures. The company and NYSPSC staff are exploring a settlement in this proceeding. In May 2014, the NYSPSC’s Chief Administrative Law Judge appointed a settlement judge to assist the parties. There is no assurance that there will be a settlement, and any settlement would be subject to NYSPSC approval. At March 31, 2014, the company had a $38 million regulatory liability relating to this matter. Included in the regulatory liability was $16 million the company recovered from vendors, arrested employees and insurers relating to this matter. Pursuant to the current rate plans, the company is applying $15 million of these recovered amounts for the benefit of customers to offset a like amount of regulatory assets. The company currently estimates that any additional amount the NYSPSC requires the company to refund to customers could range in amount from $25 million up to an amount based on the NYSPSC consultant’s $208 million estimate of overcharges.

In late October 2012, Superstorm Sandy caused extensive damage to the Utilities’ electric distribution system and interrupted service to approximately 1.4 million customers. Superstorm Sandy also damaged CECONY’s steam system and interrupted service to many of its steam customers. As of March 31, 2014, CECONY and O&R incurred response and restoration costs for Superstorm Sandy of $490 million and $93 million, respectively (including capital expenditures of $149 million and $15 million, respectively). Most of the costs that were not capitalized were deferred for recovery as a regulatory asset under the Utilities’ electric rate plans. See “Regulatory Assets and Liabilities” below. CECONY’s current electric rate plan includes collection from customers of deferred storm costs (including for Superstorm Sandy), subject to refund following NYSPSC review of the costs. O&R expects to request recovery of deferred storm costs for its New York electric operations, which are also subject to NYSPSC review, when it next files with the NYSPSC for a new electric rate plan. In March 2013, the NJBPU established a proceeding to review the prudency of costs incurred by New Jersey utilities in response to major storm events in 2011 and 2012. In November 2013, RECO filed an electric rate request with the NJBPU which includes a proposal for recovery over a three-year period of its deferred storm costs of $27 million. In May 2014, RECO, the NJBPU staff and the New Jersey Division of Rate Counsel entered into a stipulation of settlement regarding RECO’s deferred storm costs. The stipulation, which is subject to NJBPU approval, provides that RECO’s deferred storm costs are deemed reasonable, prudent and eligible for recovery over a period to be determined in RECO’s electric rate proceeding.

Regulatory Assets and Liabilities

Regulatory assets and liabilities at March 31, 2014 and December 31, 2013 were comprised of the following items:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Regulatory assets
Unrecognized pension and other postretirement costs		$2,591		$2,730		$2,478		$2,610
Future income tax		2,183		2,145		2,070		2,030
Environmental remediation costs		921		938		814		830
Deferred storm costs		411		441		307		334
Revenue taxes		216		207		204		196
Pension and other postretirement benefits deferrals		191		237		163		211
Surcharge for New York State assessment		144		78		136		74
Net electric deferrals		78		83		78		83
Unamortized loss on reacquired debt		63		65		60		62
O&R transition bond charges		31		33		—		—
Preferred stock redemption		28		28		28		28
Property tax reconciliation		25		22		—		—
Workers’ compensation		12		12		12		12
Deferred derivative losses – noncurrent		6		8		5		7
Other		182		174		167		162
Regulatory assets – noncurrent		7,082		7,201		6,522		6,639
Deferred derivative losses – current		7		25		5		22
Recoverable energy costs – current		1		4		—		4
Regulatory assets – current		8		29		5		26
Total Regulatory Assets		$7,090		$7,230		$6,527		$6,665
Regulatory liabilities
Allowance for cost of removal less salvage		$ 558		$ 540		$ 466		$ 453
Property tax reconciliation		299		322		299		322
Property tax refunds		119		130		119		130
Long-term interest rate reconciliation		99		105		99		105
Carrying charges on repair allowance and bonus depreciation		81		88		80		87
New York State income tax rate change		66		—		62		—
Net unbilled revenue deferrals		61		133		61		133
World Trade Center settlement proceeds		57		62		57		62
Other postretirement benefit deferrals		51		50		47		50
2014 rate plan base rate revenue deferral		50		—		50		—
Prudence proceeding		38		40		38		40
Unrecognized other postretirement benefits costs		32		—		23		—
Carrying charges on T&D net plant – electric and steam		27		28		21		20
Electric excess earnings		22		22		18		18
Other		240		208		207		178
Regulatory liabilities – noncurrent		1,800		1,728		1,647		1,598
Refundable energy costs – current		160		100		128		66
Deferred derivative gains – current		44		14		36		11
Revenue decoupling mechanism		23		34		19		30
Future income tax		16		—		16		—
Regulatory liabilities – current		243		148		199		107
Total Regulatory Liabilities		$2,043		$1,876		$1,846		$1,705

CECONY [Member]

Regulatory Matters

Note B — Regulatory Matters

Other Regulatory Matters

Regulatory Assets and Liabilities

Regulatory assets and liabilities at March 31, 2014 and December 31, 2013 were comprised of the following items:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Regulatory assets
Unrecognized pension and other postretirement costs		$2,591		$2,730		$2,478		$2,610
Future income tax		2,183		2,145		2,070		2,030
Environmental remediation costs		921		938		814		830
Deferred storm costs		411		441		307		334
Revenue taxes		216		207		204		196
Pension and other postretirement benefits deferrals		191		237		163		211
Surcharge for New York State assessment		144		78		136		74
Net electric deferrals		78		83		78		83
Unamortized loss on reacquired debt		63		65		60		62
O&R transition bond charges		31		33		—		—
Preferred stock redemption		28		28		28		28
Property tax reconciliation		25		22		—		—
Workers’ compensation		12		12		12		12
Deferred derivative losses – noncurrent		6		8		5		7
Other		182		174		167		162
Regulatory assets – noncurrent		7,082		7,201		6,522		6,639
Deferred derivative losses – current		7		25		5		22
Recoverable energy costs – current		1		4		—		4
Regulatory assets – current		8		29		5		26
Total Regulatory Assets		$7,090		$7,230		$6,527		$6,665
Regulatory liabilities
Allowance for cost of removal less salvage		$ 558		$ 540		$ 466		$ 453
Property tax reconciliation		299		322		299		322
Property tax refunds		119		130		119		130
Long-term interest rate reconciliation		99		105		99		105
Carrying charges on repair allowance and bonus depreciation		81		88		80		87
New York State income tax rate change		66		—		62		—
Net unbilled revenue deferrals		61		133		61		133
World Trade Center settlement proceeds		57		62		57		62
Other postretirement benefit deferrals		51		50		47		50
2014 rate plan base rate revenue deferral		50		—		50		—
Prudence proceeding		38		40		38		40
Unrecognized other postretirement benefits costs		32		—		23		—
Carrying charges on T&D net plant – electric and steam		27		28		21		20
Electric excess earnings		22		22		18		18
Other		240		208		207		178
Regulatory liabilities – noncurrent		1,800		1,728		1,647		1,598
Refundable energy costs – current		160		100		128		66
Deferred derivative gains – current		44		14		36		11
Revenue decoupling mechanism		23		34		19		30
Future income tax		16		—		16		—
Regulatory liabilities – current		243		148		199		107
Total Regulatory Liabilities		$2,043		$1,876		$1,846		$1,705

Capitalization

3 Months Ended

Mar. 31, 2014

Capitalization

Note C — Capitalization

In February 2014, CECONY redeemed at maturity $200 million of 4.70 percent 10-year debentures. In March 2014, CECONY issued $850 million aggregate principal amount of 4.45 percent 30-year debentures.

The carrying amounts and fair values of long-term debt are:


*(Millions of Dollars)*	March 31, 2014				December 31, 2013
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison	$	11,623	$	13,000	$	10,974	$	12,082
CECONY	$	10,491	$	11,692	$	9,841	$	10,797

Fair values of long-term debt have been estimated primarily using available market information. For Con Edison, $12,364 million and $636 million of the fair value of long-term debt at March 31, 2014 are classified as Level 2 and Level 3, respectively. For CECONY, $11,056 million and $636 million of the fair value of long-term debt at March 31, 2014 are classified as Level 2 and Level 3, respectively (see Note M). The $636 million of long-term debt classified as Level 3 is CECONY’s tax-exempt, auction-rate securities for which the market is highly illiquid and there is a lack of observable inputs.

CECONY [Member]

Capitalization

Note C — Capitalization

In February 2014, CECONY redeemed at maturity $200 million of 4.70 percent 10-year debentures. In March 2014, CECONY issued $850 million aggregate principal amount of 4.45 percent 30-year debentures.

The carrying amounts and fair values of long-term debt are:


*(Millions of Dollars)*	March 31, 2014				December 31, 2013
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison	$	11,623	$	13,000	$	10,974	$	12,082
CECONY	$	10,491	$	11,692	$	9,841	$	10,797

Short-Term Borrowing	3 Months Ended
Short-Term Borrowing	Mar. 31, 2014
Short-Term Borrowing	Note D — Short-Term Borrowing At March 31, 2014, Con Edison had $830 million of commercial paper outstanding of which $669 million was outstanding under CECONY’s program. The weighted average interest rate was 0.2 percent for both Con Edison and CECONY. At December 31, 2013, Con Edison had $1,451 million of commercial paper outstanding of which $1,210 million was outstanding under CECONY’s program. The weighted average interest rate was 0.2 percent for both Con Edison and CECONY. At March 31, 2014 and December 31, 2013, no loans were outstanding under the Companies’ credit agreement and $56 million (including $11 million for CECONY) and $26 million (including $11 million for CECONY) of letters of credit were outstanding, respectively, under the credit agreement.
CECONY [Member]
Short-Term Borrowing	Note D — Short-Term Borrowing At March 31, 2014, Con Edison had $830 million of commercial paper outstanding of which $669 million was outstanding under CECONY’s program. The weighted average interest rate was 0.2 percent for both Con Edison and CECONY. At December 31, 2013, Con Edison had $1,451 million of commercial paper outstanding of which $1,210 million was outstanding under CECONY’s program. The weighted average interest rate was 0.2 percent for both Con Edison and CECONY. At March 31, 2014 and December 31, 2013, no loans were outstanding under the Companies’ credit agreement and $56 million (including $11 million for CECONY) and $26 million (including $11 million for CECONY) of letters of credit were outstanding, respectively, under the credit agreement.

- Definition

The entire disclosure for short-term debt.

+ References+ Details

Pension Benefits

3 Months Ended

Mar. 31, 2014

Pension Benefits

Note E — Pension Benefits

Net Periodic Benefit Cost

The components of the Companies’ net periodic benefit costs for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Service cost – including administrative expenses		$ 57			$ 67			$ 53			$ 62
Interest cost on projected benefit obligation		143			134			134			126
Expected return on plan assets		(208	)		(187	)		(197	)		(178	)
Recognition of net actuarial loss		154			208			146			197
Recognition of prior service costs		1			1			1			1
NET PERIODIC BENEFIT COST		$ 147			$ 223			$ 137			$ 208
Cost capitalized		(51	)		(82	)		(49	)		(79	)
Reconciliation to rate level		26			11			23			13
Cost charged to operating expenses		$ 122			$ 152			$ 111			$ 142

Expected Contributions

Based on estimates as of March 31, 2014, the Companies expect to make contributions to the pension plan during 2014 of $564 million (of which $524 million is to be contributed by CECONY). The Companies’ policy is to fund their accounting cost to the extent tax deductible. During the first quarter of 2014, CECONY contributed $200 million to the pension plan. The Companies expect to fund $13 million for the non-qualified supplemental plans in 2014.

CECONY [Member]

Pension Benefits

Note E — Pension Benefits

Net Periodic Benefit Cost

The components of the Companies’ net periodic benefit costs for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Service cost – including administrative expenses		$ 57			$ 67			$ 53			$ 62
Interest cost on projected benefit obligation		143			134			134			126
Expected return on plan assets		(208	)		(187	)		(197	)		(178	)
Recognition of net actuarial loss		154			208			146			197
Recognition of prior service costs		1			1			1			1
NET PERIODIC BENEFIT COST		$ 147			$ 223			$ 137			$ 208
Cost capitalized		(51	)		(82	)		(49	)		(79	)
Reconciliation to rate level		26			11			23			13
Cost charged to operating expenses		$ 122			$ 152			$ 111			$ 142

Expected Contributions

Other Postretirement Benefits

3 Months Ended

Mar. 31, 2014

Other Postretirement Benefits

Note F — Other Postretirement Benefits

Net Periodic Benefit Cost

The components of the Companies’ net periodic postretirement benefit costs for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Service cost	$	5		$	6		$	4		$	5
Interest cost on accumulated other postretirement benefit obligation		15			14			13			12
Expected return on plan assets		(19	)		(19	)		(17	)		(17	)
Recognition of net actuarial loss		14			16			13			14
Recognition of prior service cost		(5	)		(7	)		(4	)		(6	)
NET PERIODIC POSTRETIREMENT BENEFIT COST	$	10		$	10		$	9		$	8
Cost capitalized		(4	)		(3	)		(3	)		(2	)
Reconciliation to rate level		3			12			—			11
Cost charged to operating expenses	$	9		$	19		$	6		$	17

Expected Contributions

Based on estimates as of March 31, 2014, Con Edison expects to make a contribution of $7 million, nearly all of which is for CECONY, to the other postretirement benefit plans in 2014.

Environmental Matters

3 Months Ended

Mar. 31, 2014

Environmental Matters

Note G — 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 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 March 31, 2014 and December 31, 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Accrued Liabilities:
Manufactured gas plant sites		$663		$665		$560		$562
Other Superfund Sites		78		84		77		82
Total		$741		$749		$637		$644
Regulatory assets		$921		$938		$814		$830

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. Under their current rate plans, the Utilities are permitted to recover or defer as regulatory assets (for subsequent recovery through rates) certain site investigation and remediation costs.

Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Remediation costs incurred		$9		$10		$8		$7
Insurance recoveries received*		5		—		5		—
* Reduced amount deferred for recovery from customers

In 2013, CECONY estimated that for its manufactured gas plant sites, its aggregate undiscounted potential liability for the investigation and remediation of coal tar and/or other manufactured gas plant-related environmental contaminants could range up to $2.4 billion. In 2013, O&R estimated that for its manufactured gas plant sites, each of which has been investigated, the aggregate undiscounted potential liability for the remediation of such contaminants could range up to $167 million. 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. In 2013, Con Edison and CECONY estimated that their aggregate undiscounted potential liabilities for these suits and additional suits that may be brought over the next 15 years were $8 million and $7 million, respectively. The estimates were based upon a combination of modeling, historical data analysis and risk factor assessment. Actual experience may be materially different. In addition, certain current and former employees have claimed or are claiming workers’ compensation benefits based on alleged disability from exposure to asbestos. Under its current rate plans, 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 March 31, 2014 and December 31, 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Accrued liability – asbestos suits	$	8	$	8	$	7	$	7
Regulatory assets – asbestos suits	$	8	$	8	$	7	$	7
Accrued liability – workers’ compensation	$	87	$	87	$	82	$	82
Regulatory assets – workers’ compensation	$	12	$	12	$	12	$	12

CECONY [Member]

Environmental Matters

Note G — Environmental Matters

Superfund Sites

The accrued liabilities and regulatory assets related to Superfund Sites at March 31, 2014 and December 31, 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Accrued Liabilities:
Manufactured gas plant sites		$663		$665		$560		$562
Other Superfund Sites		78		84		77		82
Total		$741		$749		$637		$644
Regulatory assets		$921		$938		$814		$830

Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Remediation costs incurred		$9		$10		$8		$7
Insurance recoveries received*		5		—		5		—
* Reduced amount deferred for recovery from customers

Asbestos Proceedings


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Accrued liability – asbestos suits	$	8	$	8	$	7	$	7
Regulatory assets – asbestos suits	$	8	$	8	$	7	$	7
Accrued liability – workers’ compensation	$	87	$	87	$	82	$	82
Regulatory assets – workers’ compensation	$	12	$	12	$	12	$	12

- Definition

The entire disclosure for environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. This element may be used for all of an entity's disclosures about environmental loss contingencies.

+ References+ Details

Other Material Contingencies

3 Months Ended

Mar. 31, 2014

Other Material Contingencies

Note H – Other Material Contingencies

Manhattan Steam Main Rupture

In July 2007, a CECONY steam main located in midtown Manhattan ruptured. It has been reported that one person died and others were injured as a result of the incident. Several buildings in the area were damaged. Debris from the incident included dirt and mud containing asbestos. The response to the incident required the closing of several buildings and streets for various periods. Approximately 90 suits are pending against the company seeking generally unspecified compensatory and, in some cases, punitive damages, for 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 to satisfy its liability to others in connection with the suits. At March 31, 2014, the company had accrued its estimated liability for the suits of $50 million and an insurance receivable in the same amount.

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 Street 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 48 people were injured. Additional buildings were also damaged. The National Transportation Safety Board is investigating. The parties to the investigation include the company, the City of New York, the Pipeline and Hazardous Materials Safety Administration and the NYSPSC (which is also conducting an investigation). Several suits are pending against the company seeking generally unspecified damages for personal injury and property damage. 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 related to the incident. At March 31, 2014, the company had not accrued a liability for the incident.

Other Contingencies

See “Other Regulatory Matters” in Note B.

Guarantees

Con Edison and its subsidiaries enter into various agreements providing financial or performance assurance primarily to third parties on behalf of their subsidiaries. Maximum amounts guaranteed by Con Edison totaled $1,500 million and $1,331 million at March 31, 2014 and December 31, 2013, respectively.

A summary, by type and term, of Con Edison’s total guarantees at March 31, 2014 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions	$	785	$	35	$	68	$	888
Solar energy projects		568		13		—		581
Other		31		—		—		31
Total	$	1,384	$	48	$	68	$	1,500

Energy Transactions — Con Edison guarantees payments on behalf of its competitive energy businesses in order to facilitate physical and financial transactions in gas, pipeline capacity, transportation, oil, electricity, 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.

Solar Energy Projects — Con Edison and Con Edison Development guarantee payments associated with the investment in solar energy facilities on behalf

of their wholly-owned subsidiaries. In addition, Con Edison Development has entered into two guarantees ($80 million maximum and $208 million maximum, respectively) on behalf of two entities in which it has a 50 percent interest in connection with the construction of solar energy facilities. Con Edison Development also provided $3 million in guarantees to Travelers Insurance Company for indemnity agreements for surety bonds in connection with the construction and operation of solar energy facilities performed by its subsidiaries.

Other — Other guarantees primarily relate to guarantees provided by Con Edison to Travelers Insurance Company for indemnity agreements for surety bonds in connection with energy service projects performed by Con Edison Solutions ($25 million). In addition, Con Edison issued a guarantee to the Public Utility Commission of Texas covering obligations of Con Edison Solutions as a retail electric provider. Con Edison’s estimate of the maximum potential obligation for this guarantee is $5 million as of March 31, 2014.

CECONY [Member]

Other Material Contingencies

Note H – Other Material Contingencies

Manhattan Steam Main Rupture

Manhattan Explosion and Fire

Other Contingencies

See “Other Regulatory Matters” in Note B.

Guarantees

A summary, by type and term, of Con Edison’s total guarantees at March 31, 2014 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions	$	785	$	35	$	68	$	888
Solar energy projects		568		13		—		581
Other		31		—		—		31
Total	$	1,384	$	48	$	68	$	1,500

Solar Energy Projects — Con Edison and Con Edison Development guarantee payments associated with the investment in solar energy facilities on behalf

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Lease In/Lease Out Transactions

3 Months Ended

Mar. 31, 2014

Lease In/Lease Out Transactions

Note I – Lease In/Lease Out Transactions

As a result of the January 2013 Court of Appeals decision, in March 2013, Con Edison recorded an after-tax charge of $150 million to reflect, as required by the accounting rules for leveraged lease transactions, the recalculation of the accounting effect of the LILO transactions based on the revised after-tax cash flows projected from the inception of the leveraged leases as well as the interest on the potential tax liability resulting from the disallowance of federal and state income tax losses with respect to the LILO transactions. In the first quarter of 2014, the interest accrued on the liability was reduced by $13 million ($7 million, net of tax). See “Uncertain Tax Positions” in Note J.

The effect of the LILO transactions on Con Edison’s consolidated income statement for the three months ended as of March 31, 2014 and 2013 were as follows:


*(Millions of Dollars)*	For the Three Months Ended March 31,
*(Millions of Dollars)*	2014			2013
Increase/(decrease) to non-utility operating revenues		$—			$(121	)
(Increase)/decrease to other interest expense		13			(131	)
Income tax benefit/(expense)		(6	)		102
Total increase/(decrease) in net income		$7			$(150	)

In January 2013, to defray interest charges, the company deposited $447 million with federal and state tax agencies relating primarily to the potential tax liability from the LILO transactions in past tax years and interest thereon. During 2013, $125 million of the deposit was returned from the IRS at the company’s request. Also in 2013, the deposit balance was reduced by an additional $48 million, due to a $10 million refund from the IRS and the application of $38 million toward the settlement of tax and interest for certain tax years, primarily relating to tax liability from the LILO transactions. In the first quarter of 2014, Con Edison applied the remainder of the deposit against its federal and state tax liabilities, including interest. See “Uncertain Tax Positions” in Note J.

CECONY [Member]

Lease In/Lease Out Transactions

Note I – Lease In/Lease Out Transactions

The effect of the LILO transactions on Con Edison’s consolidated income statement for the three months ended as of March 31, 2014 and 2013 were as follows:


*(Millions of Dollars)*	For the Three Months Ended March 31,
*(Millions of Dollars)*	2014			2013
Increase/(decrease) to non-utility operating revenues		$—			$(121	)
(Increase)/decrease to other interest expense		13			(131	)
Income tax benefit/(expense)		(6	)		102
Total increase/(decrease) in net income		$7			$(150	)

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References+ Details

Income Tax	3 Months Ended
Income Tax	Mar. 31, 2014
Income Tax	Note J — Income Tax In the first quarter of 2013, the IRS accepted on audit Con Edison’s claim for manufacturing tax deductions. Accordingly, Con Edison’s effective tax rate was favorably impacted by $15 million. In addition, as a result of interest expense on the LILO disallowances and reduction to non-utility operating revenues (see Note I), income before income tax expense for the first quarter of 2013 was significantly lower than the first quarter of 2014. Other recurring tax rate reconciling items in the first quarter of 2014 and 2013 are comparable. However, as a result of lower income before income tax expense in 2013, Con Edison’s effective tax rate was 23 percent for the three months ended March 31, 2013, compared to 35 percent for the same period in 2014. On March 31, 2014, tax legislation was enacted in the State of New York that reduces the corporate franchise tax rate from 7.1 percent to 6.5 percent, beginning January 1, 2016. The application of this legislation decreased Con Edison’s accumulated deferred tax liabilities by $77 million ($72 million for CECONY), decreased Con Edison’s regulatory asset for future income tax by $11 million ($10 million for CECONY) and increased Con Edison’s regulatory liability by $66 million ($62 million for CECONY). The impact of this tax legislation on Con Edison’s effective tax rate was immaterial and there was no impact on CECONY’s effective tax rate for the three months ended March 31, 2014. Uncertain Tax Positions During the first quarter of 2013, the IRS accepted Con Edison’s deductions for repair costs to utility plant (the “repair allowance deductions”). As a result of this settlement, Con Edison and CECONY reduced their estimated liabilities for prior year uncertain tax positions by $72 million and $66 million, respectively, with a corresponding increase to accumulated deferred income tax liabilities. In addition, as a result of the January 2013 Court of Appeals decision (see Note I), Con Edison increased its estimated prior year liabilities for federal and state uncertain tax positions by $249 million in the first quarter of 2013, with a corresponding reduction to accumulated deferred income tax liabilities. These changes to the Companies’ estimated liabilities for uncertain tax positions had no impact on income tax expense in the first quarter of 2013. As a result of positions taken on the various amended state tax returns filed in the first quarter of 2014, Con Edison increased its estimated liabilities for uncertain tax positions by $22 million. The amended state tax returns contain uncertain tax positions unique to the states, and the returns remain open for examination. At March 31, 2014, the estimated liability for uncertain tax positions for Con Edison was $31 million and was reflected as a noncurrent liability on its consolidated balance sheet. CECONY had no liabilities for uncertain tax positions. 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 first quarter of 2014, Con Edison recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in its consolidated income statements. In the first quarter of 2013, Con Edison recognized $126 million of interest expense ($131 million related to the LILO transactions, less a reduction of $5 million in accrued interest expense primarily associated with repair allowance deductions). At March 31, 2014 and December 31, 2013, Con Edison recognized an immaterial amount of accrued interest on its consolidated balance sheets. As of March 31, 2014, Con Edison reasonably expects to resolve approximately $13 million ($8 million, net of federal taxes) of its uncertainties related to certain tax matters within the next twelve months, of which the entire amount, if recognized, would affect Con Edison’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would affect Con Edison’s effective tax rate is $31 million ($20 million, net of federal taxes).
CECONY [Member]
Income Tax	Note J — Income Tax In the first quarter of 2013, the IRS accepted on audit Con Edison’s claim for manufacturing tax deductions. Accordingly, Con Edison’s effective tax rate was favorably impacted by $15 million. In addition, as a result of interest expense on the LILO disallowances and reduction to non-utility operating revenues (see Note I), income before income tax expense for the first quarter of 2013 was significantly lower than the first quarter of 2014. Other recurring tax rate reconciling items in the first quarter of 2014 and 2013 are comparable. However, as a result of lower income before income tax expense in 2013, Con Edison’s effective tax rate was 23 percent for the three months ended March 31, 2013, compared to 35 percent for the same period in 2014. On March 31, 2014, tax legislation was enacted in the State of New York that reduces the corporate franchise tax rate from 7.1 percent to 6.5 percent, beginning January 1, 2016. The application of this legislation decreased Con Edison’s accumulated deferred tax liabilities by $77 million ($72 million for CECONY), decreased Con Edison’s regulatory asset for future income tax by $11 million ($10 million for CECONY) and increased Con Edison’s regulatory liability by $66 million ($62 million for CECONY). The impact of this tax legislation on Con Edison’s effective tax rate was immaterial and there was no impact on CECONY’s effective tax rate for the three months ended March 31, 2014. Uncertain Tax Positions During the first quarter of 2013, the IRS accepted Con Edison’s deductions for repair costs to utility plant (the “repair allowance deductions”). As a result of this settlement, Con Edison and CECONY reduced their estimated liabilities for prior year uncertain tax positions by $72 million and $66 million, respectively, with a corresponding increase to accumulated deferred income tax liabilities. In addition, as a result of the January 2013 Court of Appeals decision (see Note I), Con Edison increased its estimated prior year liabilities for federal and state uncertain tax positions by $249 million in the first quarter of 2013, with a corresponding reduction to accumulated deferred income tax liabilities. These changes to the Companies’ estimated liabilities for uncertain tax positions had no impact on income tax expense in the first quarter of 2013. As a result of positions taken on the various amended state tax returns filed in the first quarter of 2014, Con Edison increased its estimated liabilities for uncertain tax positions by $22 million. The amended state tax returns contain uncertain tax positions unique to the states, and the returns remain open for examination. At March 31, 2014, the estimated liability for uncertain tax positions for Con Edison was $31 million and was reflected as a noncurrent liability on its consolidated balance sheet. CECONY had no liabilities for uncertain tax positions. 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 first quarter of 2014, Con Edison recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in its consolidated income statements. In the first quarter of 2013, Con Edison recognized $126 million of interest expense ($131 million related to the LILO transactions, less a reduction of $5 million in accrued interest expense primarily associated with repair allowance deductions). At March 31, 2014 and December 31, 2013, Con Edison recognized an immaterial amount of accrued interest on its consolidated balance sheets. As of March 31, 2014, Con Edison reasonably expects to resolve approximately $13 million ($8 million, net of federal taxes) of its uncertainties related to certain tax matters within the next twelve months, of which the entire amount, if recognized, would affect Con Edison’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would affect Con Edison’s effective tax rate is $31 million ($20 million, net of federal taxes).

- Definition

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

+ References+ Details

Financial Information by Business Segment

3 Months Ended

Mar. 31, 2014

Financial Information by Business Segment

Note K – Financial Information by Business Segment

The financial data for the business segments are as follows:


	For the Three Months Ended March 31,
	Operating revenues					Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2014		2013			2014			2013			2014		2013		2014		2013
CECONY
Electric	$	2,074	$	1,814		$	4		$	4		$	189	$	185	$	257	$	189
Gas		789		660			1			1			32		32		233		242
Steam		341		332			20			19			19		16		153		129
Consolidation adjustments		—		—			(25	)		(24	)		—		—		—		—
Total CECONY	$	3,204	$	2,806		$	—		$	—		$	240	$	233	$	643	$	560
O&R
Electric	$	163	$	145		$	—		$	—		$	10	$	10	$	12	$	20
Gas		93		82			—			—			4		4		27		27
Total O&R	$	256	$	227		$	—		$	—		$	14	$	14	$	39	$	47
Competitive energy businesses	$	329	$	152		$	3		$	2		$	7	$	4	$	2	$	(82	)
Other*		—		(1	)		(3	)		(2	)		—		—		1		1
Total Con Edison	$	3,789	$	3,184		$	—		$	—		$	261	$	251	$	685	$	526

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

CECONY [Member]

Financial Information by Business Segment

Note K – Financial Information by Business Segment

The financial data for the business segments are as follows:


	For the Three Months Ended March 31,
	Operating revenues					Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2014		2013			2014			2013			2014		2013		2014		2013
CECONY
Electric	$	2,074	$	1,814		$	4		$	4		$	189	$	185	$	257	$	189
Gas		789		660			1			1			32		32		233		242
Steam		341		332			20			19			19		16		153		129
Consolidation adjustments		—		—			(25	)		(24	)		—		—		—		—
Total CECONY	$	3,204	$	2,806		$	—		$	—		$	240	$	233	$	643	$	560
O&R
Electric	$	163	$	145		$	—		$	—		$	10	$	10	$	12	$	20
Gas		93		82			—			—			4		4		27		27
Total O&R	$	256	$	227		$	—		$	—		$	14	$	14	$	39	$	47
Competitive energy businesses	$	329	$	152		$	3		$	2		$	7	$	4	$	2	$	(82	)
Other*		—		(1	)		(3	)		(2	)		—		—		1		1
Total Con Edison	$	3,789	$	3,184		$	—		$	—		$	261	$	251	$	685	$	526

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities

Note L – Derivative Instruments and Hedging Activities

Under the accounting rules for derivatives and hedging, derivatives are recognized on the balance sheet at fair value, unless an exception is available under the accounting rules. Certain qualifying derivative contracts have been designated as normal purchases or normal sales contracts. These contracts are not reported at fair value under the accounting rules.

Energy Price Hedging

Con Edison’s subsidiaries hedge market price fluctuations associated with physical purchases and sales of electricity, natural gas, and steam by using derivative instruments including futures, forwards, basis swaps, options, transmission congestion contracts and financial transmission rights contracts.

The Companies enter into master agreements for their commodity derivatives. These agreements typically provide for setoff in the event of contract termination. In such case, generally the non-defaulting or non-affected party’s payable will be set-off by the other 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.

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at March 31, 2014 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets	$	232		$	(94	)	$	138	(a)	$	—	$	—	$	138	(a)
Derivative liabilities		(95	)		89			(6	)		—		—		(6	)
Net derivative assets/(liabilities)	$	137		$	(5	)	$	132	(a)	$	—	$	—	$	132	(a)
CECONY
Derivative assets	$	83		$	(34	)	$	49	(a)	$	—	$	—	$	49	(a)
Derivative liabilities		(36	)		33			(3	)		—		—		(3	)
Net derivative assets/(liabilities)	$	47		$	(1	)	$	46	(a)	$	—	$	—	$	46	(a)

(a)

At March 31, 2014, Con Edison and CECONY had margin deposits of $25 million and $14 million, respectively, classified as derivative assets in the balance sheet, but not included in the table. As required by an exchange, a margin is collateral, typically cash, that the holder of a derivative instrument has to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange.

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at December 31, 2013 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)		Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
									Financial instruments		Cash collateral received
Con Edison
Derivative assets	$	166	$	(101)		$	65	(a)	$	—	$	—	$	65	(a)
Derivative liabilities		(113)		98			(15	)		—		—		(15	)
Net derivative assets/(liabilities)	$	53	$	(3	)	$	50	(a)	$	—	$	—	$	50	(a)
CECONY
Derivative assets	$	41	$	(32)		$	9	(a)	$	—	$	—	$	9	(a)
Derivative liabilities		(51)		37			(14	)		—		—		(14	)
Net derivative assets/(liabilities)	$	(10)	$	5		$	(5	)(a)	$	—	$	—	$	(5	)(a)

(a)

At December 31, 2013, Con Edison and CECONY had margin deposits of $17 million and $16 million, respectively, classified as derivative assets in the balance sheet, but not included in the table. As required by an exchange, a margin is collateral, typically cash, that the holder of a derivative instrument has to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange.

Credit Exposure

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 competitive 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 of setoff.

At March 31, 2014, Con Edison and CECONY had $236 million and $48 million of credit exposure in connection with energy supply and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $96 million with independent system operators, $78 million with commodity exchange brokers, $60 million with investment-grade counterparties and $2 million with non-investment grade/non-rated counterparties. CECONY’s net credit exposure consisted of $28 million with commodity exchange brokers and $20 million with investment-grade counterparties.

Economic Hedges

The Companies enter into certain derivative instruments that do not qualify or are not designated as hedges under the accounting rules for derivatives and hedging. However, management believes these instruments represent economic hedges that mitigate exposure to fluctuations in commodity prices.

The fair values of the Companies’ commodity derivatives at March 31, 2014 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	193		$	65
Long-term	Other deferred charges and noncurrent assets		39			18
Total derivative assets		$	232		$	83
Impact of netting			(69	)		(20	)
Net derivative assets		$	163		$	63
Derivative Liabilities
Current	Fair value of derivative liabilities	$	68		$	21
Long-term	Fair value of derivative liabilities		27			15
Total derivative liabilities		$	95		$	36
Impact of netting			(89	)		(33	)
Net derivative liabilities		$	6		$	3

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The fair values of the Companies’ commodity derivatives at December 31, 2013 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	134		$	27
Long-term	Other deferred charges and noncurrent assets		32			14
Total derivative assets		$	166		$	41
Impact of netting			(84	)		(16	)
Net derivative assets		$	82		$	25
Derivative Liabilities
Current	Fair value of derivative liabilities	$	82		$	32
Long-term	Fair value of derivative liabilities		31			19
Total derivative liabilities		$	113		$	51
Impact of netting			(98	)		(37	)
Net derivative liabilities		$	15		$	14

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The Utilities generally recover all of their prudently incurred fuel, purchased power and gas cost, including hedging gains and losses, in accordance with rate provisions approved by the applicable state utility commissions. 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. Con Edison’s competitive energy businesses record realized and unrealized gains and losses on their derivative contracts in earnings in the reporting period in which they occur.

The following table presents the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three months ended March 31, 2014:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended March 31, 2014
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$	30		$	25
Long-term	Deferred derivative gains		4			4
Total deferred gains/(losses)		$	34		$	29
Current	Deferred derivative losses	$	17		$	17
Current	Recoverable energy costs		94			77
Long-term	Deferred derivative losses		2			2
Total deferred gains/(losses)		$	113		$	96
Net deferred gains/(losses)		$	147		$	125
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	175	(b)	$	—
	Gas purchased for resale		(14	)		—
	Non-utility revenue		(24	)(b)		—
Total pre-tax gain/(loss) recognized in income		$	137		$	—

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended March 31, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $20 million.

The following table presents the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three months ended March 31, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended March 31, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$	9		$	8
Long-term	Regulatory liabilities		2			1
Total deferred gains/(losses)		$	11		$	9
Current	Deferred derivative losses	$	38		$	32
Current	Recoverable energy costs		11			10
Long-term	Deferred derivative losses		7			6
Total deferred gains/(losses)		$	56		$	48
Net deferred gains/(losses)		$	67		$	57
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	67	(b)	$	—
	Gas purchased for resale		(4	)		—
	Non-utility revenue		(1	)(b)		—
Total pre-tax gain/(loss) recognized in income		$	62		$	—

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended March 31, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax gain of $1 million and $45 million, respectively.

As of March 31, 2014, Con Edison had 1,165 contracts, including 538 CECONY contracts, which were considered to be derivatives under the accounting rules for derivatives and hedging (excluding qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts). The following table presents the number of contracts by commodity type:


	Electric Derivatives								Gas Derivatives
	Number of Energy Contracts (a)		MWHs (b)		Number of Capacity Contracts (a)		MWs (b)		Number of Contracts (a)		Dths (b)		Total Number Of Contracts (a)
Con Edison		548		14,882,496		67		6,442		550		70,343,157		1,165
CECONY		87		3,198,875		4		1,200		447		64,560,000		538

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	Volumes are reported net of long and short positions.

The Companies also enter into electric congestion and gas basis swap contracts to hedge the congestion and transportation charges which are associated with electric and gas contracts and hedged volumes.

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 the Companies to provide collateral on derivative instruments in net liability positions. The amount of collateral to be provided will depend on the fair value of the derivative instruments and the Companies’ credit ratings.

The aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a net liability position and collateral posted at March 31, 2014, 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 were:


*(Millions of Dollars)*	Con Edison (a)			CECONY (a)
Aggregate fair value – net liabilities	$	2		$	1
Collateral posted	$	—		$	—
Additional collateral(b) (downgrade one level from current ratings)	$	2		$	—
Additional collateral(b) (downgrade to below investment grade from current ratings)	$	4	(c)	$	2	(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 Con Edison’s competitive energy businesses were no longer extended unsecured credit for such purchases, the Companies would be required to post collateral, which at March 31, 2014, would have amounted to an estimated $29 million for Con Edison, including $7 million for CECONY. 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 liabilities 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 of setoff.

(c)	Derivative instruments that are net assets have been excluded from the table. At March 31, 2014, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $64 million, including $1 million for CECONY.

Interest Rate Swap

O&R has an interest rate swap, which terminates in October 2014, pursuant to which it pays a fixed-rate of 6.09 percent and receives a LIBOR-based variable rate. The fair value of this interest rate swap at March 31, 2014 was an unrealized loss of $2 million, which has been included in Con Edison’s consolidated balance sheet as a current liability/fair value of derivative liabilities and a regulatory asset. The increase in the fair value of the swap for the three months ended March 31, 2014 was immaterial. In the event O&R’s credit rating was downgraded to BBB- or lower by S&P or Baa3 or lower by Moody’s, the swap counterparty could elect to terminate the agreement and, if it did so, the parties would then be required to settle the transaction.

CECONY [Member]

Derivative Instruments and Hedging Activities

Note L – Derivative Instruments and Hedging Activities

Energy Price Hedging

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at March 31, 2014 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets	$	232		$	(94	)	$	138	(a)	$	—	$	—	$	138	(a)
Derivative liabilities		(95	)		89			(6	)		—		—		(6	)
Net derivative assets/(liabilities)	$	137		$	(5	)	$	132	(a)	$	—	$	—	$	132	(a)
CECONY
Derivative assets	$	83		$	(34	)	$	49	(a)	$	—	$	—	$	49	(a)
Derivative liabilities		(36	)		33			(3	)		—		—		(3	)
Net derivative assets/(liabilities)	$	47		$	(1	)	$	46	(a)	$	—	$	—	$	46	(a)

(a)

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at December 31, 2013 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)		Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
									Financial instruments		Cash collateral received
Con Edison
Derivative assets	$	166	$	(101)		$	65	(a)	$	—	$	—	$	65	(a)
Derivative liabilities		(113)		98			(15	)		—		—		(15	)
Net derivative assets/(liabilities)	$	53	$	(3	)	$	50	(a)	$	—	$	—	$	50	(a)
CECONY
Derivative assets	$	41	$	(32)		$	9	(a)	$	—	$	—	$	9	(a)
Derivative liabilities		(51)		37			(14	)		—		—		(14	)
Net derivative assets/(liabilities)	$	(10)	$	5		$	(5	)(a)	$	—	$	—	$	(5	)(a)

(a)

Credit Exposure

Economic Hedges

The fair values of the Companies’ commodity derivatives at March 31, 2014 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	193		$	65
Long-term	Other deferred charges and noncurrent assets		39			18
Total derivative assets		$	232		$	83
Impact of netting			(69	)		(20	)
Net derivative assets		$	163		$	63
Derivative Liabilities
Current	Fair value of derivative liabilities	$	68		$	21
Long-term	Fair value of derivative liabilities		27			15
Total derivative liabilities		$	95		$	36
Impact of netting			(89	)		(33	)
Net derivative liabilities		$	6		$	3

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The fair values of the Companies’ commodity derivatives at December 31, 2013 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	134		$	27
Long-term	Other deferred charges and noncurrent assets		32			14
Total derivative assets		$	166		$	41
Impact of netting			(84	)		(16	)
Net derivative assets		$	82		$	25
Derivative Liabilities
Current	Fair value of derivative liabilities	$	82		$	32
Long-term	Fair value of derivative liabilities		31			19
Total derivative liabilities		$	113		$	51
Impact of netting			(98	)		(37	)
Net derivative liabilities		$	15		$	14

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The following table presents the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three months ended March 31, 2014:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended March 31, 2014
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$	30		$	25
Long-term	Deferred derivative gains		4			4
Total deferred gains/(losses)		$	34		$	29
Current	Deferred derivative losses	$	17		$	17
Current	Recoverable energy costs		94			77
Long-term	Deferred derivative losses		2			2
Total deferred gains/(losses)		$	113		$	96
Net deferred gains/(losses)		$	147		$	125
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	175	(b)	$	—
	Gas purchased for resale		(14	)		—
	Non-utility revenue		(24	)(b)		—
Total pre-tax gain/(loss) recognized in income		$	137		$	—

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended March 31, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $20 million.

The following table presents the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three months ended March 31, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended March 31, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$	9		$	8
Long-term	Regulatory liabilities		2			1
Total deferred gains/(losses)		$	11		$	9
Current	Deferred derivative losses	$	38		$	32
Current	Recoverable energy costs		11			10
Long-term	Deferred derivative losses		7			6
Total deferred gains/(losses)		$	56		$	48
Net deferred gains/(losses)		$	67		$	57
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	67	(b)	$	—
	Gas purchased for resale		(4	)		—
	Non-utility revenue		(1	)(b)		—
Total pre-tax gain/(loss) recognized in income		$	62		$	—

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended March 31, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax gain of $1 million and $45 million, respectively.


	Electric Derivatives								Gas Derivatives
	Number of Energy Contracts (a)		MWHs (b)		Number of Capacity Contracts (a)		MWs (b)		Number of Contracts (a)		Dths (b)		Total Number Of Contracts (a)
Con Edison		548		14,882,496		67		6,442		550		70,343,157		1,165
CECONY		87		3,198,875		4		1,200		447		64,560,000		538

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	Volumes are reported net of long and short positions.


*(Millions of Dollars)*	Con Edison (a)			CECONY (a)
Aggregate fair value – net liabilities	$	2		$	1
Collateral posted	$	—		$	—
Additional collateral(b) (downgrade one level from current ratings)	$	2		$	—
Additional collateral(b) (downgrade to below investment grade from current ratings)	$	4	(c)	$	2	(c)

(a)

(b)

(c)	Derivative instruments that are net assets have been excluded from the table. At March 31, 2014, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $64 million, including $1 million for CECONY.

Interest Rate Swap

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Fair Value Measurements

3 Months Ended

Mar. 31, 2014

Fair Value Measurements

Note M — 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 March 31, 2014 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments (d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)(f)	$	8	$	7	$	175	$	46	$	25	$	13	$	(45	)	$	(3	)	$	163	$	63
Other assets (c)(e)(f)		142		135		115		105		—		—		—			—			257		240
Total	$	150	$	142	$	290	$	151	$	25	$	13	$	(45	)	$	(3	)	$	420	$	303
Derivative liabilities:
Commodity (a)(e)(f)	$	3	$	3	$	67	$	16	$	1	$	—	$	(65)		$	(16)		$	6	$	3
Interest rate contract (b)(e)(f)		—		—		2		—		—		—		—			—			2		—
Total	$	3	$	3	$	69	$	16	$	1	$	—	$	(65)		$	(16)		$	8	$	3

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note L.

(b)	See Note L.

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

(d)	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.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the three months ended March 31, 2014.

(f)

Level 2 assets and liabilities include investments held in the deferred compensation plan and/or non-qualified retirement plans, interest rate swap, or exchange-traded contracts where there is insufficient market liquidity to warrant inclusion in Level 1, and certain over-the-counter derivative instruments for electricity 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.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments (d)				Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY
Derivative assets:
Commodity (a)(e)(f)	$	3	$	3	$	130	$	13	$	11	$	6		$(62)		$3	$	82	$	25
Other assets (c)(e)(f)		141		134		113		103		—		—		—		—		254		237
Total	$	144	$	137	$	243	$	116	$	11	$	6		$(62)		$3	$	336	$	262
Derivative liabilities:
Commodity (a)(e)(f)	$	5	$	5	$	84	$	27	$	2	$	—		$(76)		$(18)	$	15	$	14
Interest rate contract (b)(e)(f)		—		—		2		—		—		—		—		—		2		—
Total	$	5	$	5	$	86	$	27	$	2	$	—		$(76)		$(18)	$	17	$	14

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note L.

(b)	See Note L.

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

(d)	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.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the year ended December 31, 2013.

(f)

The employees in the risk management groups of the Utilities and the competitive energy businesses develop and maintain the Companies’ valuation policies and procedures for, and verify pricing and fair value valuation of, commodity derivatives. Under the Companies’ policies and procedures, multiple independent sources of information are obtained for forward price curves used to value commodity derivatives. Fair value and changes in fair value of commodity derivatives 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 competitive energy businesses. The managers of the risk management groups report to the Companies’ Vice President and Treasurer.

Fair Value of Level
3 at
March 31, 2014

(Millions of Dollars)

Valuation

Techniques

Unobservable Inputs

Range

Con Edison—Commodity

Electricity

Discounted Cash Flow

Forward energy prices (a)

$28.00-$137.00 per MWH

Discounted Cash Flow

Forward capacity prices (a)

$10.00 per kW-month

Transmission Congestion Contracts / Financial Transmission Rights

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

(5.8)%-50.6%

Discount to adjust auction prices for historical monthly realized settlements (b)

(236.2)%-49.1%

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

$(0.99)-$12.00 per MWH

Total Con Edison—Commodity

CECONY—Commodity

Transmission Congestion Contracts

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

(5.8)%-50.6%

Discount to adjust auction prices for historical monthly realized settlements (b)

(236.2)%-49.1%

(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 March 31, 2014 and 2013 and classified as Level 3 in the fair value hierarchy:


	For the Three Months Ended March 31, 2014
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2014		Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of March 31, 2014
Con Edison
Derivatives:
Commodity	$	9	$	50	$	4	$	8	$	—	$	—	$	(47)	$	—	$	24
CECONY
Derivatives:
Commodity	$	6	$	11	$	4	$	7	$	—	$	—	$	(15)	$	—	$	13


	For the Three Months Ended March 31, 2013
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2013		Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of March 31,2013
Con Edison
Derivatives:
Commodity	$	(5)	$	31	$	5	$	4	$	—	$	—	$	(21)	$	—	$	14
CECONY
Derivatives:
Commodity	$	10	$	10	$	1	$	4	$	—	$	—	$	(14)	$	—	$	11

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 commissions. 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 competitive energy businesses, realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues (immaterial and immaterial) and purchased power costs ($39 million gain and $19 million gain) on the consolidated income statement for the three months ended March 31, 2014 and 2013, respectively. The change in fair value relating to Level 3 commodity derivative assets and liabilities held at March 31, 2014 and 2013 is included in non-utility revenues (immaterial and immaterial) and purchased power costs ($8 million gain and $16 million gain) on the consolidated income statement for the three months ended March 31, 2014 and 2013, respectively.

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 March 31, 2014, the Companies determined that nonperformance risk would have no material impact on their financial position or results of operations. To assess nonperformance risk, the Companies considered information such as collateral requirements, master netting arrangements, letters of credit and parent company guarantees, and applied a historical default probability based on current credit ratings and a market-based method by using the counterparty (for an asset) or the Companies’ (for a liability) credit default swaps rates.

CECONY [Member]

Fair Value Measurements

Note M — Fair Value Measurements

•

Assets and liabilities measured at fair value on a recurring basis as of March 31, 2014 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments (d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)(f)	$	8	$	7	$	175	$	46	$	25	$	13	$	(45	)	$	(3	)	$	163	$	63
Other assets (c)(e)(f)		142		135		115		105		—		—		—			—			257		240
Total	$	150	$	142	$	290	$	151	$	25	$	13	$	(45	)	$	(3	)	$	420	$	303
Derivative liabilities:
Commodity (a)(e)(f)	$	3	$	3	$	67	$	16	$	1	$	—	$	(65)		$	(16)		$	6	$	3
Interest rate contract (b)(e)(f)		—		—		2		—		—		—		—			—			2		—
Total	$	3	$	3	$	69	$	16	$	1	$	—	$	(65)		$	(16)		$	8	$	3

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note L.

(b)	See Note L.

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

(d)	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.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the three months ended March 31, 2014.

(f)

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments (d)				Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY
Derivative assets:
Commodity (a)(e)(f)	$	3	$	3	$	130	$	13	$	11	$	6		$(62)		$3	$	82	$	25
Other assets (c)(e)(f)		141		134		113		103		—		—		—		—		254		237
Total	$	144	$	137	$	243	$	116	$	11	$	6		$(62)		$3	$	336	$	262
Derivative liabilities:
Commodity (a)(e)(f)	$	5	$	5	$	84	$	27	$	2	$	—		$(76)		$(18)	$	15	$	14
Interest rate contract (b)(e)(f)		—		—		2		—		—		—		—		—		2		—
Total	$	5	$	5	$	86	$	27	$	2	$	—		$(76)		$(18)	$	17	$	14

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note L.

(b)	See Note L.

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

(d)	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.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the year ended December 31, 2013.

(f)

Fair Value of Level
3 at
March 31, 2014

(Millions of Dollars)

Valuation

Techniques

Unobservable Inputs

Range

Con Edison—Commodity

Electricity

Discounted Cash Flow

Forward energy prices (a)

$28.00-$137.00 per MWH

Discounted Cash Flow

Forward capacity prices (a)

$10.00 per kW-month

Transmission Congestion Contracts / Financial Transmission Rights

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

(5.8)%-50.6%

Discount to adjust auction prices for historical monthly realized settlements (b)

(236.2)%-49.1%

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

$(0.99)-$12.00 per MWH

Total Con Edison—Commodity

CECONY—Commodity

Transmission Congestion Contracts

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

(5.8)%-50.6%

Discount to adjust auction prices for historical monthly realized settlements (b)

(236.2)%-49.1%

(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.


	For the Three Months Ended March 31, 2014
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2014		Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of March 31, 2014
Con Edison
Derivatives:
Commodity	$	9	$	50	$	4	$	8	$	—	$	—	$	(47)	$	—	$	24
CECONY
Derivatives:
Commodity	$	6	$	11	$	4	$	7	$	—	$	—	$	(15)	$	—	$	13


	For the Three Months Ended March 31, 2013
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2013		Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of March 31,2013
Con Edison
Derivatives:
Commodity	$	(5)	$	31	$	5	$	4	$	—	$	—	$	(21)	$	—	$	14
CECONY
Derivatives:
Commodity	$	10	$	10	$	1	$	4	$	—	$	—	$	(14)	$	—	$	11

Variable Interest Entities	3 Months Ended
Variable Interest Entities	Mar. 31, 2014
Variable Interest Entities	Note N — Variable Interest Entities In March 2014, Con Edison Development purchased a 50 percent membership interest in Copper Mountain Solar 3 Holdings, LLC (CMS 3). As a result, Con Edison has a variable interest in CMS 3, which is a non-consolidated entity. CMS 3 owns a project company that is developing a 250 MW (AC) solar energy project in Nevada. Electricity generated by the project is to be sold to the Southern California Public Power Authority pursuant to a long-term power purchase agreement. Con Edison is not the primary beneficiary since the power to direct the activities that most significantly impact the economics of CMS 3 is shared equally between Con Edison Development and a third party. At March 31, 2014, Con Edison’s consolidated balance sheet includes $80 million in investments (including earnings) related to CMS 3, which assessed in accordance with the accounting rules for variable interest entities, is Con Edison’s current maximum exposure to loss in the entity. In addition, Con Edison and Con Edison Development have issued certain guarantees to third parties in connection with CMS 3. See “Guarantees” in Note H.
CECONY [Member]
Variable Interest Entities	Note N — Variable Interest Entities In March 2014, Con Edison Development purchased a 50 percent membership interest in Copper Mountain Solar 3 Holdings, LLC (CMS 3). As a result, Con Edison has a variable interest in CMS 3, which is a non-consolidated entity. CMS 3 owns a project company that is developing a 250 MW (AC) solar energy project in Nevada. Electricity generated by the project is to be sold to the Southern California Public Power Authority pursuant to a long-term power purchase agreement. Con Edison is not the primary beneficiary since the power to direct the activities that most significantly impact the economics of CMS 3 is shared equally between Con Edison Development and a third party. At March 31, 2014, Con Edison’s consolidated balance sheet includes $80 million in investments (including earnings) related to CMS 3, which assessed in accordance with the accounting rules for variable interest entities, is Con Edison’s current maximum exposure to loss in the entity. In addition, Con Edison and Con Edison Development have issued certain guarantees to third parties in connection with CMS 3. See “Guarantees” in Note H.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Earnings Per Common Share

Earnings Per Common Share

For the three months ended March 31, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


*(Millions of Dollars, except per share amounts/Shares in Millions)*	2014		2013
Net income for common stock	$	361	$	192
Weighted average common shares outstanding – basic		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.2		1.3
Adjusted weighted average common shares outstanding – diluted		294.1		294.2
Net Income for common stock per common share – basic	$	1.23	$	0.66
Net Income for common stock per common share – diluted	$	1.23	$	0.65

Changes in Accumulated Other Comprehensive Income by Component

Changes in Accumulated Other Comprehensive Income by Component

For the three months ended March 31, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


	Three Months Ended March 31,
	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Beginning balance, accumulated OCI, net of taxes	$	(25	)	$	(53	)	$	(6	)	$	(9	)
OCI before reclassifications, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively		2			1			—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY ^(a)(b)		2			2			1			—
Current period total OCI, net of taxes	$	4		$	3		$	1		$	—
Ending balance, accumulated OCI, net of taxes ^(b)	$	(21	)	$	(50	)	$	(5	)	$	(9	)

(a)

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

- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

+ References+ Details

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Earnings Per Common Share

For the three months ended March 31, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


*(Millions of Dollars, except per share amounts/Shares in Millions)*	2014		2013
Net income for common stock	$	361	$	192
Weighted average common shares outstanding – basic		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.2		1.3
Adjusted weighted average common shares outstanding – diluted		294.1		294.2
Net Income for common stock per common share – basic	$	1.23	$	0.66
Net Income for common stock per common share – diluted	$	1.23	$	0.65

Changes in Accumulated Other Comprehensive Income by Component

For the three months ended March 31, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


	Three Months Ended March 31,
	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Beginning balance, accumulated OCI, net of taxes	$	(25	)	$	(53	)	$	(6	)	$	(9	)
OCI before reclassifications, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively		2			1			—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY ^(a)(b)		2			2			1			—
Current period total OCI, net of taxes	$	4		$	3		$	1		$	—
Ending balance, accumulated OCI, net of taxes ^(b)	$	(21	)	$	(50	)	$	(5	)	$	(9	)

(a)

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

- Definition

Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share.

+ References+ Details

Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2014

Text Block [Abstract]

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities

Regulatory assets and liabilities at March 31, 2014 and December 31, 2013 were comprised of the following items:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Regulatory assets
Unrecognized pension and other postretirement costs		$2,591		$2,730		$2,478		$2,610
Future income tax		2,183		2,145		2,070		2,030
Environmental remediation costs		921		938		814		830
Deferred storm costs		411		441		307		334
Revenue taxes		216		207		204		196
Pension and other postretirement benefits deferrals		191		237		163		211
Surcharge for New York State assessment		144		78		136		74
Net electric deferrals		78		83		78		83
Unamortized loss on reacquired debt		63		65		60		62
O&R transition bond charges		31		33		—		—
Preferred stock redemption		28		28		28		28
Property tax reconciliation		25		22		—		—
Workers’ compensation		12		12		12		12
Deferred derivative losses – noncurrent		6		8		5		7
Other		182		174		167		162
Regulatory assets – noncurrent		7,082		7,201		6,522		6,639
Deferred derivative losses – current		7		25		5		22
Recoverable energy costs – current		1		4		—		4
Regulatory assets – current		8		29		5		26
Total Regulatory Assets		$7,090		$7,230		$6,527		$6,665
Regulatory liabilities
Allowance for cost of removal less salvage		$ 558		$ 540		$ 466		$ 453
Property tax reconciliation		299		322		299		322
Property tax refunds		119		130		119		130
Long-term interest rate reconciliation		99		105		99		105
Carrying charges on repair allowance and bonus depreciation		81		88		80		87
New York State income tax rate change		66		—		62		—
Net unbilled revenue deferrals		61		133		61		133
World Trade Center settlement proceeds		57		62		57		62
Other postretirement benefit deferrals		51		50		47		50
2014 rate plan base rate revenue deferral		50		—		50		—
Prudence proceeding		38		40		38		40
Unrecognized other postretirement benefits costs		32		—		23		—
Carrying charges on T&D net plant – electric and steam		27		28		21		20
Electric excess earnings		22		22		18		18
Other		240		208		207		178
Regulatory liabilities – noncurrent		1,800		1,728		1,647		1,598
Refundable energy costs – current		160		100		128		66
Deferred derivative gains – current		44		14		36		11
Revenue decoupling mechanism		23		34		19		30
Future income tax		16		—		16		—
Regulatory liabilities – current		243		148		199		107
Total Regulatory Liabilities		$2,043		$1,876		$1,846		$1,705

Capitalization (Tables)

3 Months Ended

Mar. 31, 2014

Regulated Operations [Abstract]

Carrying Amounts and Fair Values of Long-Term Debt

The carrying amounts and fair values of long-term debt are:


*(Millions of Dollars)*	March 31, 2014				December 31, 2013
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison	$	11,623	$	13,000	$	10,974	$	12,082
CECONY	$	10,491	$	11,692	$	9,841	$	10,797

Pension Benefits (Tables) (Pension Benefits [Member])

3 Months Ended

Mar. 31, 2014

Pension Benefits [Member]

Companies' Net Periodic Benefit Costs

The components of the Companies’ net periodic benefit costs for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Service cost – including administrative expenses		$ 57			$ 67			$ 53			$ 62
Interest cost on projected benefit obligation		143			134			134			126
Expected return on plan assets		(208	)		(187	)		(197	)		(178	)
Recognition of net actuarial loss		154			208			146			197
Recognition of prior service costs		1			1			1			1
NET PERIODIC BENEFIT COST		$ 147			$ 223			$ 137			$ 208
Cost capitalized		(51	)		(82	)		(49	)		(79	)
Reconciliation to rate level		26			11			23			13
Cost charged to operating expenses		$ 122			$ 152			$ 111			$ 142

Other Postretirement Benefits (Tables) (Other Postretirement Benefits [Member])

3 Months Ended

Mar. 31, 2014

Other Postretirement Benefits [Member]

Net Periodic Postretirement Benefit Costs

The components of the Companies’ net periodic postretirement benefit costs for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison						CECONY
*(Millions of Dollars)*	2014			2013			2014			2013
Service cost	$	5		$	6		$	4		$	5
Interest cost on accumulated other postretirement benefit obligation		15			14			13			12
Expected return on plan assets		(19	)		(19	)		(17	)		(17	)
Recognition of net actuarial loss		14			16			13			14
Recognition of prior service cost		(5	)		(7	)		(4	)		(6	)
NET PERIODIC POSTRETIREMENT BENEFIT COST	$	10		$	10		$	9		$	8
Cost capitalized		(4	)		(3	)		(3	)		(2	)
Reconciliation to rate level		3			12			—			11
Cost charged to operating expenses	$	9		$	19		$	6		$	17

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References+ Details

Environmental Matters (Tables)

3 Months Ended

Mar. 31, 2014

Environmental Remediation Obligations [Abstract]

Accrued Liabilities and Regulatory Assets

The accrued liabilities and regulatory assets related to Superfund Sites at March 31, 2014 and December 31, 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Accrued Liabilities:
Manufactured gas plant sites		$663		$665		$560		$562
Other Superfund Sites		78		84		77		82
Total		$741		$749		$637		$644
Regulatory assets		$921		$938		$814		$830

Environmental Remediation Costs

Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three months ended March 31, 2014 and 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Remediation costs incurred		$9		$10		$8		$7
Insurance recoveries received*		5		—		5		—
* Reduced amount deferred for recovery from customers

Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings

The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets for the Companies at March 31, 2014 and December 31, 2013 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2014		2013		2014		2013
Accrued liability – asbestos suits	$	8	$	8	$	7	$	7
Regulatory assets – asbestos suits	$	8	$	8	$	7	$	7
Accrued liability – workers’ compensation	$	87	$	87	$	82	$	82
Regulatory assets – workers’ compensation	$	12	$	12	$	12	$	12

Other Material Contingencies (Tables)

3 Months Ended

Mar. 31, 2014

Commitments And Contingencies Disclosure [Abstract]

Total Guarantees

A summary, by type and term, of Con Edison’s total guarantees at March 31, 2014 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions	$	785	$	35	$	68	$	888
Solar energy projects		568		13		—		581
Other		31		—		—		31
Total	$	1,384	$	48	$	68	$	1,500

Lease In/Lease Out Transactions (Tables)

3 Months Ended

Mar. 31, 2014

Leases [Abstract]

Schedule of Effect of LILO Transactions on Consolidated Income Statement

The effect of the LILO transactions on Con Edison’s consolidated income statement for the three months ended as of March 31, 2014 and 2013 were as follows:


*(Millions of Dollars)*	For the Three Months Ended March 31,
*(Millions of Dollars)*	2014			2013
Increase/(decrease) to non-utility operating revenues		$—			$(121	)
(Increase)/decrease to other interest expense		13			(131	)
Income tax benefit/(expense)		(6	)		102
Total increase/(decrease) in net income		$7			$(150	)

Financial Information by Business Segment (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Financial Data for Business Segments

The financial data for the business segments are as follows:


	For the Three Months Ended March 31,
	Operating revenues					Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2014		2013			2014			2013			2014		2013		2014		2013
CECONY
Electric	$	2,074	$	1,814		$	4		$	4		$	189	$	185	$	257	$	189
Gas		789		660			1			1			32		32		233		242
Steam		341		332			20			19			19		16		153		129
Consolidation adjustments		—		—			(25	)		(24	)		—		—		—		—
Total CECONY	$	3,204	$	2,806		$	—		$	—		$	240	$	233	$	643	$	560
O&R
Electric	$	163	$	145		$	—		$	—		$	10	$	10	$	12	$	20
Gas		93		82			—			—			4		4		27		27
Total O&R	$	256	$	227		$	—		$	—		$	14	$	14	$	39	$	47
Competitive energy businesses	$	329	$	152		$	3		$	2		$	7	$	4	$	2	$	(82	)
Other*		—		(1	)		(3	)		(2	)		—		—		1		1
Total Con Edison	$	3,789	$	3,184		$	—		$	—		$	261	$	251	$	685	$	526

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References+ Details

Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at March 31, 2014 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets	$	232		$	(94	)	$	138	(a)	$	—	$	—	$	138	(a)
Derivative liabilities		(95	)		89			(6	)		—		—		(6	)
Net derivative assets/(liabilities)	$	137		$	(5	)	$	132	(a)	$	—	$	—	$	132	(a)
CECONY
Derivative assets	$	83		$	(34	)	$	49	(a)	$	—	$	—	$	49	(a)
Derivative liabilities		(36	)		33			(3	)		—		—		(3	)
Net derivative assets/(liabilities)	$	47		$	(1	)	$	46	(a)	$	—	$	—	$	46	(a)

(a)

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at December 31, 2013 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)		Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
									Financial instruments		Cash collateral received
Con Edison
Derivative assets	$	166	$	(101)		$	65	(a)	$	—	$	—	$	65	(a)
Derivative liabilities		(113)		98			(15	)		—		—		(15	)
Net derivative assets/(liabilities)	$	53	$	(3	)	$	50	(a)	$	—	$	—	$	50	(a)
CECONY
Derivative assets	$	41	$	(32)		$	9	(a)	$	—	$	—	$	9	(a)
Derivative liabilities		(51)		37			(14	)		—		—		(14	)
Net derivative assets/(liabilities)	$	(10)	$	5		$	(5	)(a)	$	—	$	—	$	(5	)(a)

(a)

Fair Values of Companies' Commodity Derivatives

The fair values of the Companies’ commodity derivatives at March 31, 2014 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	193		$	65
Long-term	Other deferred charges and noncurrent assets		39			18
Total derivative assets		$	232		$	83
Impact of netting			(69	)		(20	)
Net derivative assets		$	163		$	63
Derivative Liabilities
Current	Fair value of derivative liabilities	$	68		$	21
Long-term	Fair value of derivative liabilities		27			15
Total derivative liabilities		$	95		$	36
Impact of netting			(89	)		(33	)
Net derivative liabilities		$	6		$	3

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The fair values of the Companies’ commodity derivatives at December 31, 2013 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	134		$	27
Long-term	Other deferred charges and noncurrent assets		32			14
Total derivative assets		$	166		$	41
Impact of netting			(84	)		(16	)
Net derivative assets		$	82		$	25
Derivative Liabilities
Current	Fair value of derivative liabilities	$	82		$	32
Long-term	Fair value of derivative liabilities		31			19
Total derivative liabilities		$	113		$	51
Impact of netting			(98	)		(37	)
Net derivative liabilities		$	15		$	14

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

Changes in Fair Values of Commodity Derivatives

The following table presents the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three months ended March 31, 2014:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended March 31, 2014
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$	30		$	25
Long-term	Deferred derivative gains		4			4
Total deferred gains/(losses)		$	34		$	29
Current	Deferred derivative losses	$	17		$	17
Current	Recoverable energy costs		94			77
Long-term	Deferred derivative losses		2			2
Total deferred gains/(losses)		$	113		$	96
Net deferred gains/(losses)		$	147		$	125
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	175	(b)	$	—
	Gas purchased for resale		(14	)		—
	Non-utility revenue		(24	)(b)		—
Total pre-tax gain/(loss) recognized in income		$	137		$	—

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended March 31, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $20 million.

The following table presents the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three months ended March 31, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended March 31, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains	$	9		$	8
Long-term	Regulatory liabilities		2			1
Total deferred gains/(losses)		$	11		$	9
Current	Deferred derivative losses	$	38		$	32
Current	Recoverable energy costs		11			10
Long-term	Deferred derivative losses		7			6
Total deferred gains/(losses)		$	56		$	48
Net deferred gains/(losses)		$	67		$	57
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	67	(b)	$	—
	Gas purchased for resale		(4	)		—
	Non-utility revenue		(1	)(b)		—
Total pre-tax gain/(loss) recognized in income		$	62		$	—

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended March 31, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax gain of $1 million and $45 million, respectively.

Number of Derivative Contracts by Commodity Type

The following table presents the number of contracts by commodity type:


	Electric Derivatives								Gas Derivatives
	Number of Energy Contracts (a)		MWHs (b)		Number of Capacity Contracts (a)		MWs (b)		Number of Contracts (a)		Dths (b)		Total Number Of Contracts (a)
Con Edison		548		14,882,496		67		6,442		550		70,343,157		1,165
CECONY		87		3,198,875		4		1,200		447		64,560,000		538

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	Volumes are reported net of long and short positions.

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


*(Millions of Dollars)*	Con Edison (a)			CECONY (a)
Aggregate fair value – net liabilities	$	2		$	1
Collateral posted	$	—		$	—
Additional collateral(b) (downgrade one level from current ratings)	$	2		$	—
Additional collateral(b) (downgrade to below investment grade from current ratings)	$	4	(c)	$	2	(c)

(a)

(b)

(c)	Derivative instruments that are net assets have been excluded from the table. At March 31, 2014, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $64 million, including $1 million for CECONY.

- 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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-Subparagraph (SX 210.4-08.(n)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

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 March 31, 2014 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments (d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)(f)	$	8	$	7	$	175	$	46	$	25	$	13	$	(45	)	$	(3	)	$	163	$	63
Other assets (c)(e)(f)		142		135		115		105		—		—		—			—			257		240
Total	$	150	$	142	$	290	$	151	$	25	$	13	$	(45	)	$	(3	)	$	420	$	303
Derivative liabilities:
Commodity (a)(e)(f)	$	3	$	3	$	67	$	16	$	1	$	—	$	(65)		$	(16)		$	6	$	3
Interest rate contract (b)(e)(f)		—		—		2		—		—		—		—			—			2		—
Total	$	3	$	3	$	69	$	16	$	1	$	—	$	(65)		$	(16)		$	8	$	3

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note L.

(b)	See Note L.

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

(d)	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.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the three months ended March 31, 2014.

(f)

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments (d)				Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY
Derivative assets:
Commodity (a)(e)(f)	$	3	$	3	$	130	$	13	$	11	$	6		$(62)		$3	$	82	$	25
Other assets (c)(e)(f)		141		134		113		103		—		—		—		—		254		237
Total	$	144	$	137	$	243	$	116	$	11	$	6		$(62)		$3	$	336	$	262
Derivative liabilities:
Commodity (a)(e)(f)	$	5	$	5	$	84	$	27	$	2	$	—		$(76)		$(18)	$	15	$	14
Interest rate contract (b)(e)(f)		—		—		2		—		—		—		—		—		2		—
Total	$	5	$	5	$	86	$	27	$	2	$	—		$(76)		$(18)	$	17	$	14

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note L.

(b)	See Note L.

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

(d)	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.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the year ended December 31, 2013.

(f)

Schedule of Commodity Derivatives

The managers of the risk management groups report to the Companies’ Vice President and Treasurer.

Fair Value of Level
3 at
March 31, 2014

(Millions of Dollars)

Valuation

Techniques

Unobservable Inputs

Range

Con Edison—Commodity

Electricity

Discounted Cash Flow

Forward energy prices (a)

$28.00-$137.00 per MWH

Discounted Cash Flow

Forward capacity prices (a)

$10.00 per kW-month

Transmission Congestion Contracts / Financial Transmission Rights

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

(5.8)%-50.6%

Discount to adjust auction prices for historical monthly realized settlements (b)

(236.2)%-49.1%

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

$(0.99)-$12.00 per MWH

Total Con Edison—Commodity

CECONY—Commodity

Transmission Congestion Contracts

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

(5.8)%-50.6%

Discount to adjust auction prices for historical monthly realized settlements (b)

(236.2)%-49.1%

(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 March 31, 2014
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2014		Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of March 31, 2014
Con Edison
Derivatives:
Commodity	$	9	$	50	$	4	$	8	$	—	$	—	$	(47)	$	—	$	24
CECONY
Derivatives:
Commodity	$	6	$	11	$	4	$	7	$	—	$	—	$	(15)	$	—	$	13


	For the Three Months Ended March 31, 2013
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2013		Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of March 31,2013
Con Edison
Derivatives:
Commodity	$	(5)	$	31	$	5	$	4	$	—	$	—	$	(21)	$	—	$	14
CECONY
Derivatives:
Commodity	$	10	$	10	$	1	$	4	$	—	$	—	$	(14)	$	—	$	11

Summary of Significant Accounting Policies - Earnings Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income for common stock	$ 361	$ 192
Weighted average common shares outstanding - basic	292.9	292.9
Add: Incremental shares attributable to effect of potentially dilutive securities	1.2	1.3
Adjusted weighted average common shares outstanding - diluted	294.1	294.2
Net Income for common stock per common share - basic	$ 1.23	$ 0.66
Net Income for common stock per common share - diluted	$ 1.23	$ 0.65

- Definition

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

+ References+ 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+ Details

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, accumulated OCI, net of taxes	$ (25)	$ (53)
OCI before reclassifications, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively	2	1
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY	2	2
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	4	3
Ending balance, accumulated OCI, net of taxes	(21)	(50)
CECONY [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, accumulated OCI, net of taxes	(6)	(9)
OCI before reclassifications, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY	1
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1
Ending balance, accumulated OCI, net of taxes	$ (5)	$ (9)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References+ Details

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications, Tax	$ 1	$ 1
Amounts reclassified from accumulated OCI related to pension plan liabilities, Tax	1	1
CECONY [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications, Tax
Amounts reclassified from accumulated OCI related to pension plan liabilities, Tax

Regulatory Matters - Other Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Public Utilities, General Disclosures [Line Items]
Revenues from electric		$ 249
Revenues from gas		32
Revenues from steam service		6
Potential refund to customers		1,462
Overcharges of construction expenditures	208	208
Regulatory liability	38	38
Company recovered from related parties	16	16
Amount recovered for the benefit of customers	15
Additional refundable amounts applicable to customers	25
Regulatory asset	7,090	7,090	7,230
CECONY [Member]
Public Utilities, General Disclosures [Line Items]
Response and restoration costs		490
Capital expenditures		149
Regulatory asset	6,527	6,527	6,665
O&R [Member]
Public Utilities, General Disclosures [Line Items]
Response and restoration costs		93
Capital expenditures		15
Storm Costs [Member] \| Rockland Electric Company [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory asset	$ 27	$ 27
Storm Damage [Member]
Public Utilities, General Disclosures [Line Items]
Number of customers interrupted electric distribution service		1,400,000

Regulatory Matters - Regulatory Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Regulatory assets
Regulatory assets - long-term	$ 7,082	$ 7,201
Regulatory assets - current	8	29
Total Regulatory Assets	7,090	7,230
Regulatory liabilities
Regulatory liabilities - noncurrent	1,800	1,728
Regulatory liabilities - current	243	148
Total Regulatory Liabilities	2,043	1,876
Allowance for Cost Removal Less Salvage [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	558	540
Property Tax Refunds [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	119	130
Long-Term Interest Rate Reconciliation [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	99	105
Net Unbilled Revenue Deferrals [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	61	133
Other Postretirement Benefit Deferrals [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	51	50
Carrying Charges on Repair Allowance and Bonus Depreciation [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	81	88
New York State Income Tax Rate Change [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	66
World Trade Center Settlement Proceeds [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	57	62
2014 Rate Plan Base Rate Revenue Deferral [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	50
Prudence Proceeding [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	38	40
Unrecognized Other Postretirement Benefits Costs [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	32
Carrying Charges on Transmission and Distribution Net Plant [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	27	28
Electric Excess Earnings [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	22	22
Other [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	240	208
Refundable Energy Costs - Current [Member]
Regulatory liabilities
Regulatory liabilities - current	160	100
Deferred Derivative Gains - Current [Member]
Regulatory liabilities
Regulatory liabilities - current	44	14
Revenue Decoupling Mechanism [Member]
Regulatory liabilities
Regulatory liabilities - current	23	34
Future Income Tax [Member]
Regulatory liabilities
Regulatory liabilities - current	16
Unrecognized Pension and Other Postretirement Costs [Member]
Regulatory assets
Regulatory assets - long-term	2,591	2,730
Future Income Tax [Member]
Regulatory assets
Regulatory assets - long-term	2,183	2,145
Environmental Remediation Costs [Member]
Regulatory assets
Regulatory assets - long-term	921	938
Deferred Storm Costs [Member]
Regulatory assets
Regulatory assets - long-term	411	441
Revenue Taxes [Member]
Regulatory assets
Regulatory assets - long-term	216	207
Pension and Other Postretirement Benefits Deferrals [Member]
Regulatory assets
Regulatory assets - long-term	191	237
Surcharge for New York State Assessment [Member]
Regulatory assets
Regulatory assets - long-term	144	78
Net Electric Deferrals [Member]
Regulatory assets
Regulatory assets - long-term	78	83
Unamortized Loss on Reacquired Debt [Member]
Regulatory assets
Regulatory assets - long-term	63	65
O&R Transition Bond Charges [Member]
Regulatory assets
Regulatory assets - long-term	31	33
Preferred Stock Redemption [Member]
Regulatory assets
Regulatory assets - long-term	28	28
Property Tax Reconciliation [Member]
Regulatory assets
Regulatory assets - long-term	25	22
Regulatory liabilities
Regulatory liabilities - noncurrent	299	322
Workers' Compensation [Member]
Regulatory assets
Regulatory assets - long-term	12	12
Deferred Derivative Losses - Noncurrent [Member]
Regulatory assets
Regulatory assets - long-term	6	8
Other [Member]
Regulatory assets
Regulatory assets - long-term	182	174
Deferred Derivative Losses - Current [Member]
Regulatory assets
Regulatory assets - current	7	25
Recoverable Energy Costs - Current [Member]
Regulatory assets
Regulatory assets - current	1	4
CECONY [Member]
Regulatory assets
Regulatory assets - long-term	6,522	6,639
Regulatory assets - current	5	26
Total Regulatory Assets	6,527	6,665
Regulatory liabilities
Regulatory liabilities - noncurrent	1,647	1,598
Regulatory liabilities - current	199	107
Total Regulatory Liabilities	1,846	1,705
CECONY [Member] \| Allowance for Cost Removal Less Salvage [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	466	453
CECONY [Member] \| Property Tax Refunds [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	119	130
CECONY [Member] \| Long-Term Interest Rate Reconciliation [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	99	105
CECONY [Member] \| Net Unbilled Revenue Deferrals [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	61	133
CECONY [Member] \| Other Postretirement Benefit Deferrals [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	47	50
CECONY [Member] \| Carrying Charges on Repair Allowance and Bonus Depreciation [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	80	87
CECONY [Member] \| New York State Income Tax Rate Change [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	62
CECONY [Member] \| World Trade Center Settlement Proceeds [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	57	62
CECONY [Member] \| 2014 Rate Plan Base Rate Revenue Deferral [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	50
CECONY [Member] \| Prudence Proceeding [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	38	40
CECONY [Member] \| Unrecognized Other Postretirement Benefits Costs [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	23
CECONY [Member] \| Carrying Charges on Transmission and Distribution Net Plant [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	21	20
CECONY [Member] \| Electric Excess Earnings [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	18	18
CECONY [Member] \| Other [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	207	178
CECONY [Member] \| Refundable Energy Costs - Current [Member]
Regulatory liabilities
Regulatory liabilities - current	128	66
CECONY [Member] \| Deferred Derivative Gains - Current [Member]
Regulatory liabilities
Regulatory liabilities - current	36	11
CECONY [Member] \| Revenue Decoupling Mechanism [Member]
Regulatory liabilities
Regulatory liabilities - current	19	30
CECONY [Member] \| Future Income Tax [Member]
Regulatory liabilities
Regulatory liabilities - current	16
CECONY [Member] \| Unrecognized Pension and Other Postretirement Costs [Member]
Regulatory assets
Regulatory assets - long-term	2,478	2,610
CECONY [Member] \| Future Income Tax [Member]
Regulatory assets
Regulatory assets - long-term	2,070	2,030
CECONY [Member] \| Environmental Remediation Costs [Member]
Regulatory assets
Regulatory assets - long-term	814	830
CECONY [Member] \| Deferred Storm Costs [Member]
Regulatory assets
Regulatory assets - long-term	307	334
CECONY [Member] \| Revenue Taxes [Member]
Regulatory assets
Regulatory assets - long-term	204	196
CECONY [Member] \| Pension and Other Postretirement Benefits Deferrals [Member]
Regulatory assets
Regulatory assets - long-term	163	211
CECONY [Member] \| Surcharge for New York State Assessment [Member]
Regulatory assets
Regulatory assets - long-term	136	74
CECONY [Member] \| Net Electric Deferrals [Member]
Regulatory assets
Regulatory assets - long-term	78	83
CECONY [Member] \| Unamortized Loss on Reacquired Debt [Member]
Regulatory assets
Regulatory assets - long-term	60	62
CECONY [Member] \| Preferred Stock Redemption [Member]
Regulatory assets
Regulatory assets - long-term	28	28
CECONY [Member] \| Property Tax Reconciliation [Member]
Regulatory liabilities
Regulatory liabilities - noncurrent	299	322
CECONY [Member] \| Workers' Compensation [Member]
Regulatory assets
Regulatory assets - long-term	12	12
CECONY [Member] \| Deferred Derivative Losses - Noncurrent [Member]
Regulatory assets
Regulatory assets - long-term	5	7
CECONY [Member] \| Other [Member]
Regulatory assets
Regulatory assets - long-term	167	162
CECONY [Member] \| Deferred Derivative Losses - Current [Member]
Regulatory assets
Regulatory assets - current	5	22
CECONY [Member] \| Recoverable Energy Costs - Current [Member]
Regulatory assets
Regulatory assets - current		$ 4

Capitalization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified							1 Months Ended			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Level 2 [Member]	Mar. 31, 2014 Level 3 [Member]	Mar. 31, 2014 CECONY [Member]	Dec. 31, 2013 CECONY [Member]	Feb. 28, 2014 CECONY [Member] 4.70 Percent Debentures [Member]	Mar. 31, 2014 CECONY [Member] 4.45 Percent Debentures [Member]	Mar. 31, 2014 CECONY [Member] Level 2 [Member]	Mar. 31, 2014 CECONY [Member] Level 3 [Member]
Schedule of Capitalization [Line Items]
Debentures redeemed at maturity							$ 200
Debentures interest rate							4.70%	4.45%
Period of debentures							10 years	30 years
Debentures issued								850
Long-term debt, fair value	13,000	12,082	12,364	636	11,692	10,797			11,056	636
Tax - exempt debt										$ 636

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying Amount	$ 11,623	$ 10,974
Fair Value	13,000	12,082
CECONY [Member]
Debt Instrument [Line Items]
Carrying Amount	10,491	9,841
Fair Value	$ 11,692	$ 10,797

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details

Short-Term Borrowing - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 830	$ 1,451
Weighted average interest rate	0.20%	0.20%
Loans outstanding under the credit agreement	0	0
Letters of credit outstanding under the credit agreement	56	26
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper, outstanding	669	1,210
Weighted average interest rate	0.20%	0.20%
Letters of credit outstanding under the credit agreement	$ 11	$ 11

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References+ Details

Pension Benefits - Companies' Net Periodic Benefit Costs (Detail) (Pension Benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost - including administrative expenses	$ 57	$ 67
Interest cost on projected benefit obligation	143	134
Expected return on plan assets	(208)	(187)
Recognition of net actuarial loss	154	208
Recognition of prior service costs	1	1
NET PERIODIC BENEFIT COST	147	223
Cost capitalized	(51)	(82)
Reconciliation to rate level	26	11
Cost charged to operating expenses	122	152
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - including administrative expenses	53	62
Interest cost on projected benefit obligation	134	126
Expected return on plan assets	(197)	(178)
Recognition of net actuarial loss	146	197
Recognition of prior service costs	1	1
NET PERIODIC BENEFIT COST	137	208
Cost capitalized	(49)	(79)
Reconciliation to rate level	23	13
Cost charged to operating expenses	$ 111	$ 142

Pension Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	$ 564
Pension Benefits [Member] \| CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	524
Contributions	200
Non-qualified Supplemental Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	$ 13

Other Postretirement Benefits - Net Periodic Postretirement Benefit Costs (Detail) (Other Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 6
Interest cost on accumulated other postretirement benefit obligation	15	14
Expected return on plan assets	(19)	(19)
Recognition of net actuarial loss	14	16
Recognition of prior service cost	(5)	(7)
NET PERIODIC POSTRETIREMENT BENEFIT COST	10	10
Cost capitalized	(4)	(3)
Reconciliation to rate level	3	12
Cost charged to operating expenses	9	19
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	5
Interest cost on accumulated other postretirement benefit obligation	13	12
Expected return on plan assets	(17)	(17)
Recognition of net actuarial loss	13	14
Recognition of prior service cost	(4)	(6)
NET PERIODIC POSTRETIREMENT BENEFIT COST	9	8
Cost capitalized	(3)	(2)
Reconciliation to rate level		11
Cost charged to operating expenses	$ 6	$ 17

Environmental Matters - Accrued Liabilities and Regulatory Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities:
Regulatory assets	$ 7,090	$ 7,230
Manufactured Gas Plant Sites [Member]
Accrued Liabilities:
Accrued Liabilities	663	665
Other Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	78	84
Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	741	749
Regulatory assets	921	938
CECONY [Member]
Accrued Liabilities:
Regulatory assets	6,527	6,665
CECONY [Member] \| Manufactured Gas Plant Sites [Member]
Accrued Liabilities:
Accrued Liabilities	560	562
CECONY [Member] \| Other Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	77	82
CECONY [Member] \| Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	637	644
Regulatory assets	$ 814	$ 830

Environmental Matters - Environmental Remediation Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Environmental Exit Cost [Line Items]
Remediation costs incurred	$ 9	$ 10
Insurance recoveries received	5
CECONY [Member]
Environmental Exit Cost [Line Items]
Remediation costs incurred	8	7
Insurance recoveries received	$ 5

Environmental Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Asbestos Proceedings [Member]
Site Contingency [Line Items]
Estimated undiscounted asbestos liability	$ 8
CECONY [Member] \| Asbestos Proceedings [Member]
Site Contingency [Line Items]
Estimated undiscounted asbestos liability	7
Estimated undiscounted asbestos liability in year	15 years
CECONY [Member] \| Superfund Sites [Member] \| Manufactured Gas Plant Sites [Member]
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants	2,400
O&R [Member] \| Superfund Sites [Member] \| Manufactured Gas Plant Sites [Member]
Site Contingency [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants	$ 167

Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Site Contingency [Line Items]
Regulatory assets	$ 7,090	$ 7,230
Asbestos Suits [Member]
Site Contingency [Line Items]
Accrued liability	8	8
Regulatory assets	8	8
Workers Compensation Insurance [Member]
Site Contingency [Line Items]
Accrued liability	87	87
Regulatory assets	12	12
CECONY [Member]
Site Contingency [Line Items]
Regulatory assets	6,527	6,665
CECONY [Member] \| Asbestos Suits [Member]
Site Contingency [Line Items]
Accrued liability	7	7
Regulatory assets	7	7
CECONY [Member] \| Workers Compensation Insurance [Member]
Site Contingency [Line Items]
Accrued liability	82	82
Regulatory assets	$ 12	$ 12

Other Material Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jul. 31, 2007 Person	Mar. 31, 2014 Lawsuits	Dec. 31, 2013
Operating Leased Assets [Line Items]
Number of person died in steam ruptured	1
Number of suits pending against the company		90
Insurance receivable for suits		$ 50
Description of explosion and Fire incident		On March 12, 2014, two multi-use five-story tall buildings located on Park Avenue between 116th and 117th Street 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 48 people were injured. Additional buildings were also damaged.
Guarantee obligations maximum exposure		1,500	1,331
Other [Member]
Operating Leased Assets [Line Items]
Guarantee obligations maximum exposure		31
Estimate of maximum potential obligation		5
Indemnity agreements amount		25
Con Edison Development [Member]
Operating Leased Assets [Line Items]
Percentage of variable interests		50.00%
Con Edison Development [Member] \| Guarantee One [Member]
Operating Leased Assets [Line Items]
Guarantee obligations maximum exposure		80
Con Edison Development [Member] \| Guarantee Two [Member]
Operating Leased Assets [Line Items]
Guarantee obligations maximum exposure		208
Construction and Operation of Solar Energy Facilities [Member]
Operating Leased Assets [Line Items]
Guarantees issued		3
Insurance Receivable [Member]
Operating Leased Assets [Line Items]
Estimated accrued liability for suits		$ 50

Other Material Contingencies - Total Guarantees (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 1,500	$ 1,331
Energy Transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	888
Solar Energy Projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	581
Other [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	31
0 - 3 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	1,384
0 - 3 years [Member] \| Energy Transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	785
0 - 3 years [Member] \| Solar Energy Projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	568
0 - 3 years [Member] \| Other [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	31
4 - 10 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	48
4 - 10 years [Member] \| Energy Transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	35
4 - 10 years [Member] \| Solar Energy Projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	13
4 - 10 years [Member] \| Other [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term
Greater than 10 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	68
Greater than 10 years [Member] \| Energy Transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	68
Greater than 10 years [Member] \| Solar Energy Projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term
Greater than 10 years [Member] \| Other [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term

Lease In/Lease Out Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2013	Jan. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Operating Leased Assets [Line Items]
Estimated charge after-tax	$ 150
Reduced interest expense			13	5
Uncertain tax positions, net of tax			7
Defray of interest charges relating to potential tax liability		447
Refund from IRS					10
Settlement of tax and interest					38
Transaction One [Member]
Operating Leased Assets [Line Items]
Returned deposit from IRS					125
Transaction Two [Member]
Operating Leased Assets [Line Items]
Returned deposit from IRS					$ 48

Income Tax - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Income tax benefits	$ (198)	$ (57)
Effective Tax Rate	35.00%	23.00%
Corporate franchise tax rate	7.10%
Decrease in accumulated deferred tax liabilities	77
Decrease in regulatory asset	11
Increase in regulatory liability	66
Increase in estimated prior year liabilities	22
Uncertain tax positions	31
Interest charges related to uncertain tax positions		126
Interest charges related to uncertain tax position, LILO transaction		131
Reduced interest expense	13	5
Amount of interest and penalties in consolidated income statements	0		0
Uncertain tax positions expected to resolve in next twelve months	13
Unrecognized tax benefits, if recognized, would affect effective tax rate	31
Beginning January 1, 2016 [Member]
Operating Loss Carryforwards [Line Items]
Corporate franchise tax rate	6.50%
Federal and State [Member]
Operating Loss Carryforwards [Line Items]
Accrued liability for uncertain tax positions		249
Federal Taxes [Member]
Operating Loss Carryforwards [Line Items]
Uncertain tax positions expected to resolve in next twelve months, net of federal taxes	8
Unrecognized tax benefits, if recognized, would affect effective tax rate, net of federal taxes	20
Con Edison [Member]
Operating Loss Carryforwards [Line Items]
Income tax benefits		15
Decrease in accrued liability for uncertain tax positions		72
CECONY [Member]
Operating Loss Carryforwards [Line Items]
Income tax benefits	(184)	(152)
Decrease in accumulated deferred tax liabilities	72
Decrease in regulatory asset	10
Increase in regulatory liability	62
Decrease in accrued liability for uncertain tax positions		66
Uncertain tax positions	$ 0

Financial Information by Business Segment - Financial Data for Business Segments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Operating revenues	$ 3,789	$ 3,184
Inter-segment revenues
Depreciation and amortization	261	251
Operating income	685	526
Competitive Energy Businesses [Member]
Segment Reporting Information [Line Items]
Operating revenues	329	152
Inter-segment revenues	3	2
Depreciation and amortization	7	4
Operating income	2	(82)
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues		(1)
Inter-segment revenues	(3)	(2)
Depreciation and amortization
Operating income	1	1
CECONY [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,204	2,806
Inter-segment revenues
Depreciation and amortization	240	233
Operating income	643	560
CECONY [Member] \| Operating Segments [Member] \| CECONY-Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,074	1,814
Inter-segment revenues	4	4
Depreciation and amortization	189	185
Operating income	257	189
CECONY [Member] \| Operating Segments [Member] \| CECONY-Gas [Member]
Segment Reporting Information [Line Items]
Operating revenues	789	660
Inter-segment revenues	1	1
Depreciation and amortization	32	32
Operating income	233	242
CECONY [Member] \| Operating Segments [Member] \| CECONY-Steam [Member]
Segment Reporting Information [Line Items]
Operating revenues	341	332
Inter-segment revenues	20	19
Depreciation and amortization	19	16
Operating income	153	129
CECONY [Member] \| Consolidation Adjustments [Member]
Segment Reporting Information [Line Items]
Operating revenues
Inter-segment revenues	(25)	(24)
Depreciation and amortization
Operating income
O&R [Member]
Segment Reporting Information [Line Items]
Operating revenues	256	227
Inter-segment revenues
Depreciation and amortization	14	14
Operating income	39	47
O&R [Member] \| Operating Segments [Member] \| O&R - Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues	163	145
Inter-segment revenues
Depreciation and amortization	10	10
Operating income	12	20
O&R [Member] \| Operating Segments [Member] \| O&R - Gas [Member]
Segment Reporting Information [Line Items]
Operating revenues	93	82
Inter-segment revenues
Depreciation and amortization	4	4
Operating income	$ 27	$ 27

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	$ 137	$ 53
Gross Amounts Offset in the Statement of Financial Position	(5)	(3)
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	132	50
Net Amount	132	50
Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(95)	(113)
Gross Amounts Offset in the Statement of Financial Position	89	98
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(6)	(15)
Net Amount	(6)	(15)
Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	232	166
Gross Amounts Offset in the Statement of Financial Position	(94)	(101)
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	138	65
Net Amount	138	65
CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	47	(10)
Gross Amounts Offset in the Statement of Financial Position	(1)	5
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	46	(5)
Net Amount	46	(5)
CECONY [Member] \| Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(36)	(51)
Gross Amounts Offset in the Statement of Financial Position	33	37
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(3)	(14)
Net Amount	(3)	(14)
CECONY [Member] \| Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	83	41
Gross Amounts Offset in the Statement of Financial Position	(34)	(32)
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	49	9
Net Amount	49	9
Financial Instruments [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial Instruments [Member] \| Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial Instruments [Member] \| Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial Instruments [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial Instruments [Member] \| CECONY [Member] \| Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial Instruments [Member] \| CECONY [Member] \| Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash Collateral Received [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash Collateral Received [Member] \| Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash Collateral Received [Member] \| Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash Collateral Received [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash Collateral Received [Member] \| CECONY [Member] \| Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash Collateral Received [Member] \| CECONY [Member] \| Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position

Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Contract
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 236
Makeup of net credit exposure independent system operators	96
Makeup of net credit exposure with commodity exchange brokers	78
Makeup of net credit exposure with investment-grade counterparties	60
Makeup of net credit exposure non-investment grade/non-rated counterparties	2
Number of contracts	1,165
Terminate date of interest rate swap	October 2014
Interest Rate Swap [Member]
Investment Holdings [Line Items]
Derivative, fixed interest rate	6.09%
Unrealized gain (loss) on derivatives	(2)
CECONY [Member]
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	48
Makeup of net credit exposure with commodity exchange brokers	28
Makeup of net credit exposure with investment-grade counterparties	$ 20
Number of contracts	538

Derivative Instruments and Hedging Activities - Fair Values of Companies' Commodity Derivatives (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivative Liabilities
Fair value of derivative liabilities	$ 95	$ 113
Impact of netting	(89)	(98)
Net derivatives liabilities	6	15
Derivatives Assets [Member]
Derivative Assets
Fair value of derivative assets	232	166
Impact of netting	(69)	(84)
Net derivatives assets	163	82
Derivatives Assets [Member] \| Other Current Assets [Member]
Derivative Assets
Fair value of derivative assets	193	134
Derivatives Assets [Member] \| Other Deferred Charges and Noncurrent Assets [Member]
Derivative Assets
Fair value of derivative assets	39	32
Derivatives Liabilities [Member] \| Fair Value of Derivative Liabilities, Current [Member]
Derivative Liabilities
Fair value of derivative liabilities	68	82
Derivatives Liabilities [Member] \| Fair Value of Derivative Liabilities, Long-term [Member]
Derivative Liabilities
Fair value of derivative liabilities	27	31
CECONY [Member]
Derivative Liabilities
Fair value of derivative liabilities	36	51
Impact of netting	(33)	(37)
Net derivatives liabilities	3	14
CECONY [Member] \| Derivatives Assets [Member]
Derivative Assets
Fair value of derivative assets	83	41
Impact of netting	(20)	(16)
Net derivatives assets	63	25
CECONY [Member] \| Derivatives Assets [Member] \| Other Current Assets [Member]
Derivative Assets
Fair value of derivative assets	65	27
CECONY [Member] \| Derivatives Assets [Member] \| Other Deferred Charges and Noncurrent Assets [Member]
Derivative Assets
Fair value of derivative assets	18	14
CECONY [Member] \| Derivatives Liabilities [Member] \| Fair Value of Derivative Liabilities, Current [Member]
Derivative Liabilities
Fair value of derivative liabilities	21	32
CECONY [Member] \| Derivatives Liabilities [Member] \| Fair Value of Derivative Liabilities, Long-term [Member]
Derivative Liabilities
Fair value of derivative liabilities	$ 15	$ 19

- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

+ References+ Details

- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ 34	$ 11
Total deferred gains/(losses)	113	56
Net deferred gains/(losses)	147	67
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	137	62
Deferred Derivative Gains, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	30	9
Deferred Derivative Gains, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	4
Deferred Derivative Losses, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	17	38
Recoverable Energy Costs, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	94	11
Deferred Derivative Losses, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	2	7
Regulatory Liabilities, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)		2
CECONY [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	29	9
Total deferred gains/(losses)	96	48
Net deferred gains/(losses)	125	57
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
CECONY [Member] \| Deferred Derivative Gains, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	25	8
CECONY [Member] \| Deferred Derivative Gains, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	4
CECONY [Member] \| Deferred Derivative Losses, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	17	32
CECONY [Member] \| Recoverable Energy Costs, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	77	10
CECONY [Member] \| Deferred Derivative Losses, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	2	6
CECONY [Member] \| Regulatory Liabilities, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)		1
Purchased Power Costs [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	175	67
Purchased Power Costs [Member] \| CECONY [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
Gas Purchased for Resale [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	(14)	(4)
Gas Purchased for Resale [Member] \| CECONY [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
Non-utility Revenue [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	(24)	(1)
Non-utility Revenue [Member] \| CECONY [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Non Utility Operating Revenue [Member]
Derivatives, Fair Value [Line Items]
Unrealized gain/(loss) on derivatives		$ 1
Purchased Power Costs [Member]
Derivatives, Fair Value [Line Items]
Unrealized gain/(loss) on derivatives	$ 20	$ 45

Derivative Instruments and Hedging Activities - Number of Derivative Contracts by Commodity Type (Detail)	3 Months Ended
	Mar. 31, 2014 Contract
Derivatives, Fair Value [Line Items]
Total Number of Contracts	1,165
CECONY [Member]
Derivatives, Fair Value [Line Items]
Total Number of Contracts	538
Electric Derivatives [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	548
MWHs	14,882,496
Number of Capacity Contracts	67
MWs	6,442
Electric Derivatives [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	87
MWHs	3,198,875
Number of Capacity Contracts	4
MWs	1,200
Gas Derivatives [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	550
Dths	70,343,157
Gas Derivatives [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	447
Dths	64,560,000

Derivative Instruments and Hedging Activities - Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Derivatives, Fair Value [Line Items]
Aggregate fair value - net liabilities	$ 2
Collateral posted
Additional Collateral Aggregate Fair Value Down One Level [Member]
Derivatives, Fair Value [Line Items]
Additional collateral	2
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	64
Additional collateral	4
CECONY [Member]
Derivatives, Fair Value [Line Items]
Aggregate fair value - net liabilities	1
Collateral posted
CECONY [Member] \| Additional Collateral Aggregate Fair Value Down One Level [Member]
Derivatives, Fair Value [Line Items]
Additional collateral
CECONY [Member] \| Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	1
Additional collateral	$ 2

Derivative Instruments and Hedging Activities - Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Derivatives, Fair Value [Line Items]
Collateral posted
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	64
Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	29
CECONY [Member]
Derivatives, Fair Value [Line Items]
Collateral posted
CECONY [Member] \| Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	1
CECONY [Member] \| Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	$ 7

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 420	$ 336
Total liabilities	8	17
CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	303	262
Total liabilities	3	14
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	150	144
Total liabilities	3	5
Level 1 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	142	137
Total liabilities	3	5
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	290	243
Total liabilities	69	86
Level 2 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	151	116
Total liabilities	16	27
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	25	11
Total liabilities	1	2
Level 3 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	13	6
Total liabilities
Commodity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	163	82
Derivative liabilities	6	15
Commodity [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	63	25
Derivative liabilities	3	14
Commodity [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	8	3
Derivative liabilities	3	5
Commodity [Member] \| Level 1 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	7	3
Derivative liabilities	3	5
Commodity [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	175	130
Derivative liabilities	67	84
Commodity [Member] \| Level 2 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	46	13
Derivative liabilities	16	27
Commodity [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	25	11
Derivative liabilities	1	2
Commodity [Member] \| Level 3 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	13	6
Derivative liabilities
Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	257	254
Other Assets [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	240	237
Other Assets [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	142	141
Other Assets [Member] \| Level 1 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	135	134
Other Assets [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	115	113
Other Assets [Member] \| Level 2 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	105	103
Other Assets [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Other Assets [Member] \| Level 3 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	2	2
Interest Rate Contract [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Interest Rate Contract [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Interest Rate Contract [Member] \| Level 1 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Interest Rate Contract [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	2	2
Interest Rate Contract [Member] \| Level 2 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Interest Rate Contract [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Interest Rate Contract [Member] \| Level 3 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Netting Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	(45)	(62)
Total liabilities	(65)	(76)
Netting Adjustments [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	(3)	3
Total liabilities	(16)	(18)
Netting Adjustments [Member] \| Commodity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	(45)	(62)
Derivative liabilities	(65)	(76)
Netting Adjustments [Member] \| Commodity [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	(3)	3
Derivative liabilities	(16)	(18)
Netting Adjustments [Member] \| Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Netting Adjustments [Member] \| Other Assets [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Netting Adjustments [Member] \| Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Netting Adjustments [Member] \| Interest Rate Contract [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

Fair Value Measurements - Schedule of Commodity Derivatives (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Valuation Techniques	Discounted Cash Flow
Electricity [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Valuation Techniques	Discounted Cash Flow
Transmission Congestion Contracts / Financial Transmission Rights [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Valuation Techniques	Discounted Cash Flow
Minimum [Member] \| Discount to Adjust Auction Prices for Inter-Zonal Forward Price Curves [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	(5.80%)
Minimum [Member] \| Discount to Adjust Auction Prices for Historical Monthly Realized Settlements [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	(236.20%)
Minimum [Member] \| Inter-Zonal Forward Price Curves Adjusted for Historical Zonal Losses [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range	$ (0.99)
Minimum [Member] \| Forward Energy Prices [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range	28.00
Minimum [Member] \| Forward Capacity Prices [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range	10.00
Maximum [Member] \| Discount to Adjust Auction Prices for Inter-Zonal Forward Price Curves [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	50.60%
Maximum [Member] \| Discount to Adjust Auction Prices for Historical Monthly Realized Settlements [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	49.10%
Maximum [Member] \| Inter-Zonal Forward Price Curves Adjusted for Historical Zonal Losses [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range	12.00
Maximum [Member] \| Forward Energy Prices [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range	137.00
Maximum [Member] \| Forward Capacity Prices [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range
Level 3 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	24,000,000
Level 3 [Member] \| Electricity [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	9,000,000
Level 3 [Member] \| Transmission Congestion Contracts / Financial Transmission Rights [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	15,000,000
CECONY [Member] \| Transmission Congestion Contracts [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Valuation Techniques	Discounted Cash Flow
CECONY [Member] \| Minimum [Member] \| Discount to Adjust Auction Prices for Inter-Zonal Forward Price Curves [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	(5.80%)
CECONY [Member] \| Minimum [Member] \| Discount to Adjust Auction Prices for Historical Monthly Realized Settlements [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	(236.20%)
CECONY [Member] \| Maximum [Member] \| Discount to Adjust Auction Prices for Inter-Zonal Forward Price Curves [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	50.60%
CECONY [Member] \| Maximum [Member] \| Discount to Adjust Auction Prices for Historical Monthly Realized Settlements [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unobservable Inputs Range in percentage	49.10%
CECONY [Member] \| Level 3 [Member] \| Transmission Congestion Contracts [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value of commodity derivatives	$ 13,000,000

Fair Value Measurements - Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value (Detail) (Commodity [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 9	$ (5)
Included in Earnings	50	31
Included in Regulatory Assets and Liabilities	4	5
Purchases	8	4
Issuances
Sales
Settlements	(47)	(21)
Transfer In/Out of Level 3
Ending Balance	24	14
CECONY [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	6	10
Included in Earnings	11	10
Included in Regulatory Assets and Liabilities	4	1
Purchases	7	4
Issuances
Sales
Settlements	(15)	(14)
Transfer In/Out of Level 3
Ending Balance	$ 13	$ 11

Fair Value Measurements - Additional Information (Detail) (Purchased Power Costs [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, assets measured on recurring basis, change in unrealized gain (loss)	$ 8	$ 16
Competitive Energy Businesses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets	39
Gain (loss) on Level 3 energy derivative liabilities		$ 19

Variable Interest Entities - Additional Information (Detail) (CMS 3 [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Nevada [Member] MW
Variable Interest Entity [Line Items]
Percentage of variable interests	50.00%
Solar energy project, capacity		250
Investments (including earnings)	$ 80

Lease In/Lease Out Transactions - Schedule of Effect of LILO Transactions on Consolidated Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Leased Assets [Line Items]
Increase/(decrease) in net income	$ 7	$ (150)
Non-Utility Operating Revenues [Member]
Operating Leased Assets [Line Items]
Increase/(decrease) in net income		(121)
Interest Expense [Member]
Operating Leased Assets [Line Items]
Increase/(decrease) in net income	13	(131)
Income Tax Benefit/(Expense) [Member]
Operating Leased Assets [Line Items]
Increase/(decrease) in net income	$ (6)	$ 102

Consolidated Statement of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension plan liability adjustments, taxes	$ 2	$ 2
CECONY [Member]
Pension plan liability adjustments, taxes

Other Postretirement Benefits - Additional Information (Detail) (Other Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Expected contributions	$ 7
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions	$ 7

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Margin deposits	$ 25	$ 17
CECONY [Member]
Derivatives, Fair Value [Line Items]
Margin deposits	$ 14	$ 16