Consolidated Edison (ED) 10-Q 7 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
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	'	292,885,004
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

Consolidated Income Statement (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
OPERATING REVENUES	'	'	'	'
Electric	$2,134	$2,018	$4,372	$3,977
Gas	395	366	1,277	1,108
Steam	98	118	439	450
Non-utility	284	316	612	468
TOTAL OPERATING REVENUES	2,911	2,818	6,700	6,003
OPERATING EXPENSES	'	'	'	'
Purchased power	783	768	1,746	1,475
Fuel	34	58	189	205
Gas purchased for resale	151	118	551	368
Other operations and maintenance	801	776	1,627	1,606
Depreciation and amortization	265	255	526	506
Taxes, other than income taxes	467	457	966	931
TOTAL OPERATING EXPENSES	2,501	2,432	5,605	5,091
Gain on sale of solar energy projects	45	'	45	'
OPERATING INCOME	455	386	1,140	912
OTHER INCOME (DEDUCTIONS)	'	'	'	'
Investment and other income	14	7	25	10
Allowance for equity funds used during construction	1	1	3	1
Other deductions	-6	-6	-8	-8
TOTAL OTHER INCOME (DEDUCTIONS)	9	2	20	3
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	464	388	1,160	915
INTEREST EXPENSE	'	'	'	'
Interest on long-term debt	147	145	293	288
Other interest	4	6	-5	142
Allowance for borrowed funds used during construction	-1	'	-2	-1
NET INTEREST EXPENSE	150	151	286	429
INCOME BEFORE INCOME TAX EXPENSE	314	237	874	486
INCOME TAX EXPENSE	102	65	300	122
NET INCOME FOR COMMON STOCK	212	172	574	364
Net income for common stock per common share - basic	$0.73	$0.59	$1.96	$1.24
Net income for common stock per common share - diluted	$0.72	$0.59	$1.95	$1.24
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$0.63	$0.62	$1.26	$1.23
AVERAGE NUMBER OF SHARES OUTSTANDING - BASIC (IN MILLIONS)	292.9	292.9	292.9	292.9
AVERAGE NUMBER OF SHARES OUTSTANDING - DILUTED (IN MILLIONS)	294	294.3	294	294.3
CECONY [Member]	'	'	'	'
OPERATING REVENUES	'	'	'	'
Electric	1,978	1,872	4,053	3,686
Gas	360	331	1,149	991
Steam	98	118	439	450
TOTAL OPERATING REVENUES	2,436	2,321	5,641	5,127
OPERATING EXPENSES	'	'	'	'
Purchased power	517	469	1,135	924
Fuel	34	58	189	205
Gas purchased for resale	104	98	451	317
Other operations and maintenance	699	676	1,424	1,417
Depreciation and amortization	247	235	486	468
Taxes, other than income taxes	449	439	926	890
TOTAL OPERATING EXPENSES	2,050	1,975	4,611	4,221
OPERATING INCOME	386	346	1,030	906
OTHER INCOME (DEDUCTIONS)	'	'	'	'
Investment and other income	1	3	8	5
Allowance for equity funds used during construction	1	'	1	1
Other deductions	-5	-5	-7	-7
TOTAL OTHER INCOME (DEDUCTIONS)	-3	-2	2	-1
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	383	344	1,032	905
INTEREST EXPENSE	'	'	'	'
Interest on long-term debt	130	129	258	256
Other interest	3	5	7	11
Allowance for borrowed funds used during construction	'	'	-1	-1
NET INTEREST EXPENSE	133	134	264	266
INCOME BEFORE INCOME TAX EXPENSE	250	210	768	639
INCOME TAX EXPENSE	78	57	262	209
NET INCOME FOR COMMON STOCK	$172	$153	$506	$430

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
NET INCOME	$212	$172	$574	$364
OTHER COMPREHENSIVE INCOME, NET OF TAXES	'	'	'	'
Pension and other postretirement benefit plan liability adjustments, net of taxes	1	2	5	5
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	2	5	5
COMPREHENSIVE INCOME FOR COMMON STOCK	213	174	579	369
CECONY [Member]	'	'	'	'
NET INCOME	172	153	506	430
OTHER COMPREHENSIVE INCOME, NET OF TAXES	'	'	'	'
Pension and other postretirement benefit plan liability adjustments, net of taxes	0	0	1	0
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	0	1	0
COMPREHENSIVE INCOME	$172	$153	$507	$430

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES	'	'
NET INCOME	$574	$364
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME	'	'
Depreciation and amortization	526	506
Deferred income taxes	162	-134
Rate case amortization and accruals	55	19
Common equity component of allowance for funds used during construction	-3	-1
Net derivative gains	-15	30
Pre-tax gain on termination of a LILO transaction	0	-49
Pre-tax gain on sale of solar energy projects	-45	'
Other non-cash items (net)	-6	46
CHANGES IN ASSETS AND LIABILITIES	'	'
Accounts receivable - customers, less allowance for uncollectibles	24	11
Special deposits	312	-335
Materials and supplies, including fuel oil and gas in storage	40	9
Other receivables and other current assets	2	2
Prepayments	-11	40
Accounts payable	21	-121
Pensions and retiree benefits obligations	411	467
Pensions and retiree benefits contributions	-413	-361
Accrued taxes	-407	160
Accrued interest	-76	124
Superfund and environmental remediation costs (net)	16	-6
Deferred charges, noncurrent assets and other regulatory assets	-16	-34
Deferred credits and other regulatory liabilities	154	79
Other assets	-9	66
Other liabilities	-39	-17
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,257	865
INVESTING ACTIVITIES	'	'
Utility construction expenditures	-1,073	-1,114
Cost of removal less salvage	-99	-93
Non-utility construction expenditures	-113	-129
Investments in solar energy projects	-107	-2
Proceeds from grants related to solar energy projects	36	18
Proceeds from sale of solar energy projects	108	'
Decrease in restricted cash	15	'
Proceeds from the termination of a LILO transaction	0	108
NET CASH FLOWS USED IN INVESTING ACTIVITIES	-1,233	-1,212
FINANCING ACTIVITIES	'	'
Net issuance of short-term debt	80	861
Issuance of long-term debt	850	919
Retirement of long-term debt	-478	-706
Debt issuance costs	-6	-12
Common stock dividends	-368	-360
Issuance of common shares for stock plans, net of repurchases	-2	-2
NET CASH FLOWS FROM FINANCING ACTIVITIES	76	700
CASH AND TEMPORARY CASH INVESTMENTS:	'	'
NET CHANGE FOR THE PERIOD	100	353
BALANCE AT BEGINNING OF PERIOD	674	394
BALANCE AT END OF PERIOD	774	747
Cash paid during the period for:	'	'
Interest	277	281
Income taxes	518	27
CECONY [Member]	'	'
OPERATING ACTIVITIES	'	'
NET INCOME	506	430
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME	'	'
Depreciation and amortization	486	468
Deferred income taxes	135	191
Rate case amortization and accruals	55	19
Common equity component of allowance for funds used during construction	-2	-1
Other non-cash items (net)	-17	-25
CHANGES IN ASSETS AND LIABILITIES	'	'
Accounts receivable - customers, less allowance for uncollectibles	44	22
Materials and supplies, including fuel oil and gas in storage	37	2
Other receivables and other current assets	-93	18
Prepayments	13	-8
Accounts payable	-71	-119
Pensions and retiree benefits obligations	390	435
Pensions and retiree benefits contributions	-413	-361
Accrued taxes	-240	-114
Accrued interest	12	4
Superfund and environmental remediation costs (net)	17	-4
Deferred charges, noncurrent assets and other regulatory assets	-86	-11
Deferred credits and other regulatory liabilities	142	68
Other liabilities	-33	29
NET CASH FLOWS FROM OPERATING ACTIVITIES	882	1,043
INVESTING ACTIVITIES	'	'
Utility construction expenditures	-1,007	-1,062
Cost of removal less salvage	-97	-89
NET CASH FLOWS USED IN INVESTING ACTIVITIES	-1,104	-1,151
FINANCING ACTIVITIES	'	'
Net issuance of short-term debt	272	809
Issuance of long-term debt	850	700
Retirement of long-term debt	-475	-700
Debt issuance costs	-6	-7
Dividend to parent	-356	-364
NET CASH FLOWS FROM FINANCING ACTIVITIES	285	438
CASH AND TEMPORARY CASH INVESTMENTS:	'	'
NET CHANGE FOR THE PERIOD	63	330
BALANCE AT BEGINNING OF PERIOD	633	353
BALANCE AT END OF PERIOD	696	683
Cash paid during the period for:	'	'
Interest	248	251
Income taxes	$392	$104

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
OTHER NONCURRENT ASSETS	'	'
Goodwill	$429	$429
Intangible assets, less accumulated amortization of $5 and $4 in 2014 and 2013, respectively	3	4
Regulatory assets	6,782	7,201
Other deferred charges and noncurrent assets	193	225
TOTAL OTHER NONCURRENT ASSETS	7,407	7,859
TOTAL ASSETS	40,311	40,647
CURRENT ASSETS	'	'
Cash and temporary cash investments	774	674
Special deposits	8	327
Accounts receivable - customers, less allowance for uncollectible accounts	1,221	1,251
Other receivables, less allowance for uncollectible accounts	239	240
Accrued unbilled revenue	456	514
Fuel oil, gas in storage, materials and supplies, at average cost	322	363
Prepayments	146	136
Regulatory assets	24	29
Deferred tax assets - current	43	122
Other current assets	224	235
TOTAL CURRENT ASSETS	3,457	3,891
INVESTMENTS	693	461
UTILITY PLANT, AT ORIGINAL COST	'	'
General	2,434	2,336
TOTAL	34,796	33,474
Less: Accumulated depreciation	7,342	7,072
Net	27,454	26,402
Construction work in progress	995	1,393
NET UTILITY PLANT	28,449	27,795
NON-UTILITY PROPERTY	'	'
Non-utility property, less accumulated depreciation	197	605
Construction work in progress	108	36
NET PLANT	28,754	28,436
CURRENT LIABILITIES	'	'
Long-term debt due within one year	45	485
Notes payable	1,531	1,451
Accounts payable	967	1,017
Customer deposits	333	321
Accrued taxes	69	476
Accrued interest	169	249
Accrued wages	123	92
Fair value of derivative liabilities	4	13
Regulatory liabilities	227	148
Other current liabilities	371	478
TOTAL CURRENT LIABILITIES	3,839	4,730
NONCURRENT LIABILITIES	'	'
Obligations under capital leases	1	1
Provision for injuries and damages	190	195
Pensions and retiree benefits	1,291	1,727
Superfund and other environmental costs	738	749
Asset retirement obligations	147	143
Fair value of derivative liabilities	6	5
Deferred income taxes and investment tax credits	8,505	8,466
Regulatory liabilities	1,861	1,728
Other deferred credits and noncurrent liabilities	194	169
TOTAL NONCURRENT LIABILITIES	12,933	13,183
LONG-TERM DEBT	11,084	10,489
COMMON SHAREHOLDERS' EQUITY (See Statement of Common Shareholders' Equity)	12,455	12,245
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	40,311	40,647
CECONY [Member]	'	'
OTHER NONCURRENT ASSETS	'	'
Regulatory assets	6,235	6,639
Other deferred charges and noncurrent assets	137	146
TOTAL OTHER NONCURRENT ASSETS	6,372	6,785
TOTAL ASSETS	36,467	36,258
CURRENT ASSETS	'	'
Cash and temporary cash investments	696	633
Special deposits	2	86
Accounts receivable - customers, less allowance for uncollectible accounts	1,079	1,123
Other receivables, less allowance for uncollectible accounts	127	127
Accrued unbilled revenue	360	405
Accounts receivable from affiliated companies	285	119
Fuel oil, gas in storage, materials and supplies, at average cost	263	300
Prepayments	89	102
Regulatory assets	21	26
Deferred tax assets - current	23	100
Other current assets	115	55
TOTAL CURRENT ASSETS	3,060	3,076
INVESTMENTS	267	247
UTILITY PLANT, AT ORIGINAL COST	'	'
General	2,245	2,154
TOTAL	32,554	31,312
Less: Accumulated depreciation	6,716	6,469
Net	25,838	24,843
Construction work in progress	925	1,303
NET UTILITY PLANT	26,763	26,146
NON-UTILITY PROPERTY	'	'
Non-utility property, less accumulated depreciation	5	4
NET PLANT	26,768	26,150
CURRENT LIABILITIES	'	'
Long-term debt due within one year	0	475
Notes payable	1,482	1,210
Accounts payable	748	824
Accounts payable to affiliated companies	21	45
Customer deposits	320	308
Accrued taxes	30	46
Accrued taxes to affiliated companies	189	413
Accrued interest	151	139
Accrued wages	115	82
Fair value of derivative liabilities	1	12
Regulatory liabilities	180	107
Other current liabilities	309	385
TOTAL CURRENT LIABILITIES	3,546	4,046
NONCURRENT LIABILITIES	'	'
Obligations under capital leases	1	1
Provision for injuries and damages	177	180
Pensions and retiree benefits	1,024	1,453
Superfund and other environmental costs	637	644
Asset retirement obligations	146	143
Fair value of derivative liabilities	6	3
Deferred income taxes and investment tax credits	7,870	7,832
Regulatory liabilities	1,702	1,598
Other deferred credits and noncurrent liabilities	144	145
TOTAL NONCURRENT LIABILITIES	11,707	11,999
LONG-TERM DEBT	10,216	9,366
COMMON SHAREHOLDERS' EQUITY (See Statement of Common Shareholders' Equity)	10,998	10,847
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	36,467	36,258
Electric [Member]	'	'
UTILITY PLANT, AT ORIGINAL COST	'	'
Utility plant, at original cost	24,338	23,450
Electric [Member] | CECONY [Member]	'	'
UTILITY PLANT, AT ORIGINAL COST	'	'
Utility plant, at original cost	22,898	22,073
Gas [Member]	'	'
UTILITY PLANT, AT ORIGINAL COST	'	'
Utility plant, at original cost	5,805	5,494
Gas [Member] | CECONY [Member]	'	'
UTILITY PLANT, AT ORIGINAL COST	'	'
Utility plant, at original cost	5,192	4,891
Steam [Member]	'	'
UTILITY PLANT, AT ORIGINAL COST	'	'
Utility plant, at original cost	2,219	2,194
Steam [Member] | CECONY [Member]	'	'
UTILITY PLANT, AT ORIGINAL COST	'	'
Utility plant, at original cost	$2,219	$2,194

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounts receivable - customers, allowance for uncollectible accounts	$96	$93
Other receivables, allowance for uncollectible accounts	12	10
Non-utility property, accumulated depreciation	84	90
Intangible assets, accumulated amortization	5	4
CECONY [Member]	'	'
Accounts receivable - customers, allowance for uncollectible accounts	90	87
Other receivables, allowance for uncollectible accounts	10	8
Non-utility property, accumulated depreciation	$25	$25

Consolidated_Statement_of_Comm

Consolidated Statement of Common Shareholders' Equity (USD $)

Total

CECONY [Member]

Common Stock [Member]

Common Stock [Member]

Additional Paid-In Capital [Member]

Additional Paid-In Capital [Member]

Retained Earnings [Member]

Retained Earnings [Member]

Treasury Stock [Member]

Capital Stock Expense [Member]

Capital Stock Expense [Member]

Accumulated Other Comprehensive Income/(Loss) [Member]

Accumulated Other Comprehensive Income/(Loss) [Member]

Repurchased Con Edison Stock [Member]

In Millions, except Share data

CECONY [Member]

CECONY [Member]

CECONY [Member]

CECONY [Member]

CECONY [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

'

'

'

'

'

192

'

'

'

'

'

'

'

NET INCOME

'

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

0

'

'

'

'

'

'

'

'

'

3

0

'

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, 2012

11,869

10,552

'

589

'

4,234

'

'

'

-61

-61

'

'

-962

BALANCE (In Shares) at Dec. 31, 2012

'

'

'

235,488,094

'

'

'

'

'

'

'

'

'

'

Net income for common stock

364

430

'

'

'

'

'

'

'

'

'

'

'

'

NET INCOME

364

430

'

'

'

'

'

'

'

'

'

'

'

'

BALANCE at Jun. 30, 2013

11,883

10,618

'

589

'

4,234

'

'

'

-61

-61

'

'

-962

BALANCE (In Shares) at Jun. 30, 2013

'

'

'

235,488,094

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

Net income for common stock

172

153

'

'

'

'

172

'

'

'

'

'

'

'

NET INCOME

172

153

'

'

'

'

'

153

'

'

'

'

'

'

Common stock dividend to parent

-180

-182

'

'

'

'

-180

-182

'

'

'

'

'

'

Issuance of common shares for stock plans, net of repurchases

0

'

'

'

1

'

'

'

-1

'

'

'

'

'

Issuance of common shares for stock plans, net of repurchases (In Shares)

'

'

-4,078

'

'

'

'

'

'

'

'

'

'

'

Issuance of common shares for stock plans, repurchases (In Shares)

'

'

'

'

'

'

'

'

4,078

'

'

'

'

'

Other comprehensive income

2

0

'

'

'

'

'

'

'

'

'

2

0

'

BALANCE at Jun. 30, 2013

11,883

10,618

32

589

4,990

4,234

8,001

6,827

-1,031

-61

-61

-48

-9

-962

BALANCE (In Shares) at Jun. 30, 2013

'

'

292,963,286

235,488,094

'

'

'

'

23,119,310

'

'

'

'

'

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

'

'

'

'

'

361

'

'

'

'

'

'

'

NET INCOME

'

334

'

'

'

'

'

334

'

'

'

'

'

'

Common stock dividend to parent

-184

-178

'

'

'

'

-184

-178

'

'

'

'

'

'

Issuance of common shares for stock plans, net of repurchases

0

'

'

'

-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

'

'

'

'

'

BALANCE at Dec. 31, 2013

12,245

10,847

'

589

'

4,234

'

'

'

-61

-61

'

'

-962

BALANCE (In Shares) at Dec. 31, 2013

'

'

'

235,488,094

'

'

'

'

'

'

'

'

'

'

Net income for common stock

574

506

'

'

'

'

'

'

'

'

'

'

'

'

NET INCOME

574

506

'

'

'

'

'

'

'

'

'

'

'

'

BALANCE at Jun. 30, 2014

12,455

10,998

'

589

4,993

4,234

'

'

'

-61

-61

'

-5

-962

BALANCE (In Shares) at Jun. 30, 2014

'

'

'

235,488,094

'

'

'

'

'

'

'

'

'

'

BALANCE at Mar. 31, 2014

12,426

11,004

32

589

'

4,234

8,515

7,209

-1,032

-61

-61

-21

'

-962

BALANCE (In Shares) at Mar. 31, 2014

'

'

292,924,052

235,488,094

'

'

'

'

23,158,544

'

'

'

'

'

Net income for common stock

212

172

'

'

'

'

212

'

'

'

'

'

'

'

NET INCOME

212

172

'

'

'

'

'

172

'

'

'

'

'

'

Common stock dividend to parent

-184

-178

'

'

'

'

-184

-178

'

'

'

'

'

'

Issuance of common shares for stock plans, net of repurchases

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common shares for stock plans, net of repurchases (In Shares)

'

'

-45,658

'

'

'

'

'

'

'

'

'

'

'

Issuance of common shares for stock plans, repurchases (In Shares)

'

'

'

'

'

'

'

'

45,658

'

'

'

'

'

Other comprehensive income

1

0

'

'

'

'

'

'

'

'

'

1

'

'

BALANCE at Jun. 30, 2014

$12,455

$10,998

$32

$589

$4,993

$4,234

$8,543

$7,203

($1,032)

($61)

($61)

($20)

($5)

($962)

BALANCE (In Shares) at Jun. 30, 2014

'

'

292,878,394

235,488,094

'

'

'

'

23,204,202

'

'

'

'

'

General

General	6 Months Ended
	Jun. 30, 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 and their separate unaudited financial statements (including the combined notes thereto) included in Part I, Item 1 of their combined Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014. 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 energy 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 and their separate unaudited financial statements (including the combined notes thereto) included in Part I, Item 1 of their combined Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014. 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 energy infrastructure projects.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Summary of Significant Accounting Policies	'
	Note A — Summary of Significant Accounting Policies
	Earnings Per Common Share
	For the three and six months ended June 30, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:
			For the Three Months						For the Six Months
			Ended June 30,						Ended June 30,
	(Millions of Dollars, except per share amounts/Shares in Millions)		2014			2013			2014			2013
	Net income for common stock		$	212		$	172		$	574		$	364
	Weighted average common shares outstanding – basic			292.9			292.9			292.9			292.9
	Add: Incremental shares attributable to effect of potentially dilutive securities			1.1			1.4			1.1			1.4
	Adjusted weighted average common shares outstanding – diluted			294			294.3			294			294.3
	Net Income for common stock per common share – basic		$	0.73		$	0.59		$	1.96		$	1.24
	Net Income for common stock per common share – diluted		$	0.72		$	0.59		$	1.95		$	1.24
	The computation of diluted EPS for the three and six months ended June 30, 2014 and 2013 excludes immaterial amounts of performance share awards which were not included because of their anti-dilutive effect.
	Changes in Accumulated Other Comprehensive Income by Component
	For the three and six months ended June 30, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:
			For the Three Months Ended June 30,
			Con Edison						CECONY
	(Millions of Dollars)		2014			2013			2014			2013
	Beginning balance, accumulated OCI, net of taxes		$	(21	)	$	(50	)	$	(5	)	$	(9	)
	OCI before reclassifications, net of tax of $- and $- for both Con Edison and CECONY			—			—			—			—
	Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively (a)(b)			1			2			—			—
	Current period total OCI, net of taxes		$	1		$	2		$	—		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
			For the Six Months Ended June 30,
			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 and other postretirement benefit plan liabilities, net of tax of $2 and $2 for Con Edison and $- and $- for CECONY, respectively (a)(b)			3			4			1			—
	Current period total OCI, net of taxes		$	5		$	5		$	1		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
	(a)	For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of net periodic pension and other postretirement benefit cost. See Notes E and F.
	(b)	Tax reclassified from accumulated OCI is reported in income tax expense.
	Reclassifications and Revisions
	Prior period amounts have been reclassified where necessary to conform to the current period presentation.
	Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013, incorrectly reduced net cash flows from financing activities and increased net cash flows from operating activities by an amount equal to the $108 million of net cash proceeds from the termination of the 1999 LILO transaction (see Note I). A revision was made on Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013. The company does not deem this revision material to its consolidated financial statements for the six months ended June 30, 2013.
CECONY [Member]	'
Summary of Significant Accounting Policies	'
	Note A — Summary of Significant Accounting Policies
	Earnings Per Common Share
	For the three and six months ended June 30, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:
			For the Three Months						For the Six Months
			Ended June 30,						Ended June 30,
	(Millions of Dollars, except per share amounts/Shares in Millions)		2014			2013			2014			2013
	Net income for common stock		$	212		$	172		$	574		$	364
	Weighted average common shares outstanding – basic			292.9			292.9			292.9			292.9
	Add: Incremental shares attributable to effect of potentially dilutive securities			1.1			1.4			1.1			1.4
	Adjusted weighted average common shares outstanding – diluted			294			294.3			294			294.3
	Net Income for common stock per common share – basic		$	0.73		$	0.59		$	1.96		$	1.24
	Net Income for common stock per common share – diluted		$	0.72		$	0.59		$	1.95		$	1.24
	The computation of diluted EPS for the three and six months ended June 30, 2014 and 2013 excludes immaterial amounts of performance share awards which were not included because of their anti-dilutive effect.
	Changes in Accumulated Other Comprehensive Income by Component
	For the three and six months ended June 30, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:
			For the Three Months Ended June 30,
			Con Edison						CECONY
	(Millions of Dollars)		2014			2013			2014			2013
	Beginning balance, accumulated OCI, net of taxes		$	(21	)	$	(50	)	$	(5	)	$	(9	)
	OCI before reclassifications, net of tax of $- and $- for both Con Edison and CECONY			—			—			—			—
	Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively (a)(b)			1			2			—			—
	Current period total OCI, net of taxes		$	1		$	2		$	—		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
			For the Six Months Ended June 30,
			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 and other postretirement benefit plan liabilities, net of tax of $2 and $2 for Con Edison and $- and $- for CECONY, respectively (a)(b)			3			4			1			—
	Current period total OCI, net of taxes		$	5		$	5		$	1		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
	(a)	For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of net periodic pension and other postretirement benefit cost. See Notes E and F.
	(b)	Tax reclassified from accumulated OCI is reported in income tax expense.
	Reclassifications and Revisions
	Prior period amounts have been reclassified where necessary to conform to the current period presentation.
	Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013, incorrectly reduced net cash flows from financing activities and increased net cash flows from operating activities by an amount equal to the $108 million of net cash proceeds from the termination of the 1999 LILO transaction (see Note I). A revision was made on Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013. The company does not deem this revision material to its consolidated financial statements for the six months ended June 30, 2013.

Regulatory_Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2014
Regulatory Matters	'
	Note B — Regulatory Matters
	Rate Plans
	In July 2014, the New Jersey Board of Public Utilities (NJBPU) approved an electric rate increase, effective August 1, 2014, of $13 million for O&R’s New Jersey regulated utility subsidiary, Rockland Electric Company (RECO). The new rates, among other things, reflect a return on common equity of 9.75 percent, a common equity ratio of approximately 50 percent and recovery of $25.6 million of deferred storm costs over a four-year period. The NJBPU continued provisions with respect to recovery from customers of the cost of purchased power and did not provide for reconciliation of actual expenses to amounts reflected in electric rates for pension and other postretirement benefit costs.
	In June 2014, O&R’s Pennsylvania regulated utility subsidiary, Pike County Light & Power Company, the staff of the Pennsylvania Public Utility Commission (PAPUC) and other parties entered into settlement agreements with respect to the company’s requests to increase the rates it can charge for electric and gas delivery service. The settlements, which provide for electric and gas rate increases, effective September 1, 2014, of $1.25 million and $100,000 respectively, are subject to approval by the PAPUC.
	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 June 30, 2014, the company had collected an estimated $1,531 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 June 30, 2014, the company had a $37 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 June 30, 2014, CECONY and O&R incurred response and restoration costs for Superstorm Sandy of $495 million and $92 million, respectively (including capital expenditures of $147 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. RECO’s current electric rate plan includes collection from customers of deferred storm costs. See “Rate Plans” above.
	In June 2014, the NYSPSC initiated a proceeding to investigate the practices of qualifying persons to perform plastic fusions on gas facilities. New York State regulations require gas utilities to qualify and, except in certain circumstances, annually requalify workers that perform fusion to join plastic pipe. The NYSPSC directed the New York gas utilities to provide information in this proceeding about their compliance with the qualification and requalification requirements and related matters; their procedures for compliance with all gas safety regulations; and their annual chief executive officer certifications regarding these and other procedures. CECONY’s qualification and requalification procedures had not included certain required testing to evaluate specimen fuses. In addition, CECONY and O&R had not timely requalified certain workers that had been qualified under their respective procedures to perform plastic fusions. CECONY and O&R have requalified their workers who perform plastic fusions.
	Regulatory Assets and Liabilities
	Regulatory assets and liabilities at June 30, 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		$2,438		$2,730		$2,331		$2,610
	Future income tax		2,158		2,145		2,049		2,030
	Environmental remediation costs		911		938		806		830
	Deferred storm costs		382		441		280		334
	Revenue taxes		214		207		203		196
	Pension and other postretirement benefits deferrals		135		237		109		211
	Surcharge for New York State assessment		110		78		103		74
	Net electric deferrals		73		83		73		83
	Unamortized loss on reacquired debt		61		65		58		62
	O&R transition bond charges		30		33		—		—
	Preferred stock redemption		28		28		28		28
	Property tax reconciliation		28		22		—		—
	Workers’ compensation		12		12		12		12
	Deferred derivative losses – noncurrent		8		8		8		7
	Other		194		174		175		162
	Regulatory assets – noncurrent		6,782		7,201		6,235		6,639
	Recoverable energy costs – current		16		4		14		4
	Deferred derivative losses – current		8		25		7		22
	Regulatory assets – current		24		29		21		26
	Total Regulatory Assets		$6,806		$7,230		$6,256		$6,665
	Regulatory liabilities
	Allowance for cost of removal less salvage		$   569		$   540		$   475		$   453
	Property tax reconciliation		282		322		282		322
	Net unbilled revenue deferrals		115		133		115		133
	Property tax refunds		108		130		108		130
	Long-term interest rate reconciliation		92		105		92		105
	Carrying charges on repair allowance and bonus depreciation		87		98		72		87
	2014 rate plan base rate revenue deferral		82		—		82		—
	New York State income tax rate change		69		—		65		—
	World Trade Center settlement proceeds		52		62		52		62
	Other postretirement benefits deferrals		49		50		43		50
	Unrecognized other postretirement benefits costs		41		—		32		—
	Prudence proceeding		37		40		37		40
	Carrying charges on T&D net plant – electric and steam		24		28		21		20
	Electric excess earnings		21		22		20		18
	Other		233		198		206		178
	Regulatory liabilities – noncurrent		1,861		1,728		1,702		1,598
	Refundable energy costs – current		147		100		110		66
	Deferred derivative gains – current		45		14		36		11
	Revenue decoupling mechanism		18		34		18		30
	Future income tax		17		—		16		—
	Regulatory liabilities – current		227		148		180		107
	Total Regulatory Liabilities		$2,088		$1,876		$1,882		$1,705
CECONY [Member]	'
Regulatory Matters	'
	Note B — Regulatory Matters
	Rate Plans
	In July 2014, the New Jersey Board of Public Utilities (NJBPU) approved an electric rate increase, effective August 1, 2014, of $13 million for O&R’s New Jersey regulated utility subsidiary, Rockland Electric Company (RECO). The new rates, among other things, reflect a return on common equity of 9.75 percent, a common equity ratio of approximately 50 percent and recovery of $25.6 million of deferred storm costs over a four-year period. The NJBPU continued provisions with respect to recovery from customers of the cost of purchased power and did not provide for reconciliation of actual expenses to amounts reflected in electric rates for pension and other postretirement benefit costs.
	In June 2014, O&R’s Pennsylvania regulated utility subsidiary, Pike County Light & Power Company, the staff of the Pennsylvania Public Utility Commission (PAPUC) and other parties entered into settlement agreements with respect to the company’s requests to increase the rates it can charge for electric and gas delivery service. The settlements, which provide for electric and gas rate increases, effective September 1, 2014, of $1.25 million and $100,000 respectively, are subject to approval by the PAPUC.
	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 June 30, 2014, the company had collected an estimated $1,531 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 June 30, 2014, the company had a $37 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 June 30, 2014, CECONY and O&R incurred response and restoration costs for Superstorm Sandy of $495 million and $92 million, respectively (including capital expenditures of $147 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. RECO’s current electric rate plan includes collection from customers of deferred storm costs. See “Rate Plans” above.
	In June 2014, the NYSPSC initiated a proceeding to investigate the practices of qualifying persons to perform plastic fusions on gas facilities. New York State regulations require gas utilities to qualify and, except in certain circumstances, annually requalify workers that perform fusion to join plastic pipe. The NYSPSC directed the New York gas utilities to provide information in this proceeding about their compliance with the qualification and requalification requirements and related matters; their procedures for compliance with all gas safety regulations; and their annual chief executive officer certifications regarding these and other procedures. CECONY’s qualification and requalification procedures had not included certain required testing to evaluate specimen fuses. In addition, CECONY and O&R had not timely requalified certain workers that had been qualified under their respective procedures to perform plastic fusions. CECONY and O&R have requalified their workers who perform plastic fusions.
	Regulatory Assets and Liabilities
	Regulatory assets and liabilities at June 30, 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		$2,438		$2,730		$2,331		$2,610
	Future income tax		2,158		2,145		2,049		2,030
	Environmental remediation costs		911		938		806		830
	Deferred storm costs		382		441		280		334
	Revenue taxes		214		207		203		196
	Pension and other postretirement benefits deferrals		135		237		109		211
	Surcharge for New York State assessment		110		78		103		74
	Net electric deferrals		73		83		73		83
	Unamortized loss on reacquired debt		61		65		58		62
	O&R transition bond charges		30		33		—		—
	Preferred stock redemption		28		28		28		28
	Property tax reconciliation		28		22		—		—
	Workers’ compensation		12		12		12		12
	Deferred derivative losses – noncurrent		8		8		8		7
	Other		194		174		175		162
	Regulatory assets – noncurrent		6,782		7,201		6,235		6,639
	Recoverable energy costs – current		16		4		14		4
	Deferred derivative losses – current		8		25		7		22
	Regulatory assets – current		24		29		21		26
	Total Regulatory Assets		$6,806		$7,230		$6,256		$6,665
	Regulatory liabilities
	Allowance for cost of removal less salvage		$   569		$   540		$   475		$   453
	Property tax reconciliation		282		322		282		322
	Net unbilled revenue deferrals		115		133		115		133
	Property tax refunds		108		130		108		130
	Long-term interest rate reconciliation		92		105		92		105
	Carrying charges on repair allowance and bonus depreciation		87		98		72		87
	2014 rate plan base rate revenue deferral		82		—		82		—
	New York State income tax rate change		69		—		65		—
	World Trade Center settlement proceeds		52		62		52		62
	Other postretirement benefits deferrals		49		50		43		50
	Unrecognized other postretirement benefits costs		41		—		32		—
	Prudence proceeding		37		40		37		40
	Carrying charges on T&D net plant – electric and steam		24		28		21		20
	Electric excess earnings		21		22		20		18
	Other		233		198		206		178
	Regulatory liabilities – noncurrent		1,861		1,728		1,702		1,598
	Refundable energy costs – current		147		100		110		66
	Deferred derivative gains – current		45		14		36		11
	Revenue decoupling mechanism		18		34		18		30
	Future income tax		17		—		16		—
	Regulatory liabilities – current		227		148		180		107
	Total Regulatory Liabilities		$2,088		$1,876		$1,882		$1,705

Capitalization

Capitalization	6 Months Ended
	Jun. 30, 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. In April 2014, CECONY redeemed at maturity $275 million of 5.55 percent 5-year debentures. In May 2014, Con Edison deconsolidated $217 million of long-term debt of a subsidiary in which Con Edison Development sold a 50 percent interest. See Note N.
	The carrying amounts and fair values of long-term debt are:
	(Millions of Dollars)	June 30, 2014				December 31, 2013
	Long-Term Debt (including current portion)	Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Con Edison	$	11,129	$	12,707	$	10,974	$	12,082
	CECONY	$	10,216	$	11,605	$	9,841	$	10,797
	Fair values of long-term debt have been estimated primarily using available market information. For Con Edison, $12,071 million and $636 million of the fair value of long-term debt at June 30, 2014 are classified as Level 2 and Level 3, respectively. For CECONY, $10,969 million and $636 million of the fair value of long-term debt at June 30, 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. In April 2014, CECONY redeemed at maturity $275 million of 5.55 percent 5-year debentures. In May 2014, Con Edison deconsolidated $217 million of long-term debt of a subsidiary in which Con Edison Development sold a 50 percent interest. See Note N.
	The carrying amounts and fair values of long-term debt are:
	(Millions of Dollars)	June 30, 2014				December 31, 2013
	Long-Term Debt (including current portion)	Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Con Edison	$	11,129	$	12,707	$	10,974	$	12,082
	CECONY	$	10,216	$	11,605	$	9,841	$	10,797
	Fair values of long-term debt have been estimated primarily using available market information. For Con Edison, $12,071 million and $636 million of the fair value of long-term debt at June 30, 2014 are classified as Level 2 and Level 3, respectively. For CECONY, $10,969 million and $636 million of the fair value of long-term debt at June 30, 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.

ShortTerm_Borrowing

Short-Term Borrowing	6 Months Ended
	Jun. 30, 2014
Short-Term Borrowing	'
	Note D — Short-Term Borrowing
	At June 30, 2014, Con Edison had $1,531 million of commercial paper outstanding of which $1,482 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 June 30, 2014 and December 31, 2013, no loans were outstanding under the Companies’ credit agreement and $49 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 June 30, 2014, Con Edison had $1,531 million of commercial paper outstanding of which $1,482 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 June 30, 2014 and December 31, 2013, no loans were outstanding under the Companies’ credit agreement and $49 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.

Pension_Benefits

Pension Benefits	6 Months Ended
	Jun. 30, 2014
Pension Benefits	'
	Note E — Pension Benefits
	Net Periodic Benefit Cost
	The components of the Companies’ net periodic benefit costs for the three and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		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	)		(198	)		(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		$	136		$	208
	Amortization of regulatory asset		1			1			1			1
	TOTAL PERIODIC BENEFIT COST	$	148		$	224		$	137		$	209
	Cost capitalized		(57	)		(88	)		(54	)		(84	)
	Reconciliation to rate level		30			(30	)		28			(29	)
	Cost charged to operating expenses	$	121		$	106		$	111		$	96
		For the Six Months Ended June 30,
		Con Edison						CECONY
	(Millions of Dollars)	2014			2013			2014			2013
	Service cost – including administrative expenses	$	113		$	133		$	106		$	124
	Interest cost on projected benefit obligation		286			268			268			252
	Expected return on plan assets		(416	)		(375	)		(395	)		(356	)
	Recognition of net actuarial loss		309			416			293			394
	Recognition of prior service costs		2			3			1			2
	NET PERIODIC BENEFIT COST	$	294		$	445		$	273		$	416
	Amortization of regulatory asset		1			1			1			1
	TOTAL PERIODIC BENEFIT COST	$	295		$	446		$	274		$	417
	Cost capitalized		(109	)		(170	)		(103	)		(163	)
	Reconciliation to rate level		57			(24	)		51			(23	)
	Cost charged to operating expenses	$	243		$	252		$	222		$	231
	Expected Contributions
	Based on estimates as of June 30, 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 six months of 2014, CECONY contributed $400 million to the pension plan and funded $13 million for the non-qualified supplemental plans.
CECONY [Member]	'
Pension Benefits	'
	Note E — Pension Benefits
	Net Periodic Benefit Cost
	The components of the Companies’ net periodic benefit costs for the three and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		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	)		(198	)		(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		$	136		$	208
	Amortization of regulatory asset		1			1			1			1
	TOTAL PERIODIC BENEFIT COST	$	148		$	224		$	137		$	209
	Cost capitalized		(57	)		(88	)		(54	)		(84	)
	Reconciliation to rate level		30			(30	)		28			(29	)
	Cost charged to operating expenses	$	121		$	106		$	111		$	96
		For the Six Months Ended June 30,
		Con Edison						CECONY
	(Millions of Dollars)	2014			2013			2014			2013
	Service cost – including administrative expenses	$	113		$	133		$	106		$	124
	Interest cost on projected benefit obligation		286			268			268			252
	Expected return on plan assets		(416	)		(375	)		(395	)		(356	)
	Recognition of net actuarial loss		309			416			293			394
	Recognition of prior service costs		2			3			1			2
	NET PERIODIC BENEFIT COST	$	294		$	445		$	273		$	416
	Amortization of regulatory asset		1			1			1			1
	TOTAL PERIODIC BENEFIT COST	$	295		$	446		$	274		$	417
	Cost capitalized		(109	)		(170	)		(103	)		(163	)
	Reconciliation to rate level		57			(24	)		51			(23	)
	Cost charged to operating expenses	$	243		$	252		$	222		$	231
	Expected Contributions
	Based on estimates as of June 30, 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 six months of 2014, CECONY contributed $400 million to the pension plan and funded $13 million for the non-qualified supplemental plans.

Other_Postretirement_Benefits

Other Postretirement Benefits	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		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			13			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		$	9		$	9		$	8
	Cost capitalized		(4	)		(4	)		(4	)		(4	)
	Reconciliation to rate level		3			16			1			13
	Cost charged to operating expenses	$	9		$	21		$	6		$	17
		For the Six Months Ended June 30,
		Con Edison						CECONY
	(Millions of Dollars)	2014			2013			2014			2013
	Service cost	$	10		$	12		$	7		$	9
	Interest cost on accumulated other postretirement benefit obligation		30			27			26			23
	Expected return on plan assets		(38	)		(39	)		(34	)		(34	)
	Recognition of net actuarial loss		28			32			26			28
	Recognition of prior service cost		(10	)		(13	)		(7	)		(11	)
	NET PERIODIC POSTRETIREMENT BENEFIT COST	$	20		$	19		$	18		$	15
	Cost capitalized		(8	)		(7	)		(7	)		(6	)
	Reconciliation to rate level		6			29			1			25
	Cost charged to operating expenses	$	18		$	41		$	12		$	34
	Expected Contributions
	Based on estimates as of June 30, 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.
CECONY [Member]	'
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 and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		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			13			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		$	9		$	9		$	8
	Cost capitalized		(4	)		(4	)		(4	)		(4	)
	Reconciliation to rate level		3			16			1			13
	Cost charged to operating expenses	$	9		$	21		$	6		$	17
		For the Six Months Ended June 30,
		Con Edison						CECONY
	(Millions of Dollars)	2014			2013			2014			2013
	Service cost	$	10		$	12		$	7		$	9
	Interest cost on accumulated other postretirement benefit obligation		30			27			26			23
	Expected return on plan assets		(38	)		(39	)		(34	)		(34	)
	Recognition of net actuarial loss		28			32			26			28
	Recognition of prior service cost		(10	)		(13	)		(7	)		(11	)
	NET PERIODIC POSTRETIREMENT BENEFIT COST	$	20		$	19		$	18		$	15
	Cost capitalized		(8	)		(7	)		(7	)		(6	)
	Reconciliation to rate level		6			29			1			25
	Cost charged to operating expenses	$	18		$	41		$	12		$	34
	Expected Contributions
	Based on estimates as of June 30, 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

Environmental Matters	6 Months Ended
	Jun. 30, 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 June 30, 2014 and December 31, 2013 were as follows:
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Accrued Liabilities:
	Manufactured gas plant sites		$658		$665		$558		$562
	Other Superfund Sites		80		84		79		82
	Total		$738		$749		$637		$644
	Regulatory assets		$911		$938		$806		$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 and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Remediation costs incurred		$5		$14		$2		$13
	Insurance recoveries received		—		—		—		—
		For the Six Months Ended June 30,
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Remediation costs incurred		$14		$24		$10		$20
	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 June 30, 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	$	88	$	87	$	82	$	82
	Regulatory assets – workers’ compensation	$	12	$	12	$	12	$	12
CECONY [Member]	'
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 June 30, 2014 and December 31, 2013 were as follows:
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Accrued Liabilities:
	Manufactured gas plant sites		$658		$665		$558		$562
	Other Superfund Sites		80		84		79		82
	Total		$738		$749		$637		$644
	Regulatory assets		$911		$938		$806		$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 and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Remediation costs incurred		$5		$14		$2		$13
	Insurance recoveries received		—		—		—		—
		For the Six Months Ended June 30,
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Remediation costs incurred		$14		$24		$10		$20
	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 June 30, 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	$	88	$	87	$	82	$	82
	Regulatory assets – workers’ compensation	$	12	$	12	$	12	$	12

Other_Material_Contingencies

Other Material Contingencies	6 Months Ended
	Jun. 30, 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 June 30, 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 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. 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 June 30, 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 $1,428 million and $1,331 million at June 30, 2014 and December 31, 2013, respectively.
	A summary, by type and term, of Con Edison’s total guarantees at June 30, 2014 is as follows:
	Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
		(Millions of Dollars)
	Energy transactions	$	744	$	25	$	68	$	837
	Solar energy projects		560		—		—		560
	Other		31		—		—		31
	Total	$	1,335	$	25	$	68	$	1,428
	Energy Transactions — Con Edison guarantees payments on behalf of its competitive energy businesses in order to facilitate physical and financial transactions in natural gas, pipeline capacity, transportation, oil, electricity, renewable energy credits and energy services. To the extent that liabilities exist under thecontracts 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 $120 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 June 30, 2014.
CECONY [Member]	'
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 June 30, 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 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. 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 June 30, 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 $1,428 million and $1,331 million at June 30, 2014 and December 31, 2013, respectively.
	A summary, by type and term, of Con Edison’s total guarantees at June 30, 2014 is as follows:
	Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
		(Millions of Dollars)
	Energy transactions	$	744	$	25	$	68	$	837
	Solar energy projects		560		—		—		560
	Other		31		—		—		31
	Total	$	1,335	$	25	$	68	$	1,428
	Energy Transactions — Con Edison guarantees payments on behalf of its competitive energy businesses in order to facilitate physical and financial transactions in natural gas, pipeline capacity, transportation, oil, electricity, renewable energy credits and energy services. To the extent that liabilities exist under thecontracts 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 $120 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 June 30, 2014.

Lease_InLease_Out_Transactions

Lease In/Lease Out Transactions	6 Months Ended
	Jun. 30, 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 its 1997 and 1999 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 second quarter of 2013, the 1999 LILO transaction was terminated, as a result of which the company realized a $29 million gain (after-tax). In the first quarter of 2014, the interest accrued on the liability was reduced by $13 million ($7 million, net of tax).
	The effect of the LILO transactions on Con Edison’s consolidated income statement for the three and six months ended as of June 30, 2014 and 2013 was as follows:
		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
	(Millions of Dollars)	2014		2013		2014		2013
	Increase/(decrease) to non-utility operating revenues	$	—	$	51	$	—	$	-70
	(Increase)/decrease to other interest expense		—		—		13		-131
	Income tax benefit/(expense)		—		-22		-6		80
	Total increase/(decrease) in net income	$	—	$	29	$	7	$	-121
	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
	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 its 1997 and 1999 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 second quarter of 2013, the 1999 LILO transaction was terminated, as a result of which the company realized a $29 million gain (after-tax). In the first quarter of 2014, the interest accrued on the liability was reduced by $13 million ($7 million, net of tax).
	The effect of the LILO transactions on Con Edison’s consolidated income statement for the three and six months ended as of June 30, 2014 and 2013 was as follows:
		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
	(Millions of Dollars)	2014		2013		2014		2013
	Increase/(decrease) to non-utility operating revenues	$	—	$	51	$	—	$	-70
	(Increase)/decrease to other interest expense		—		—		13		-131
	Income tax benefit/(expense)		—		-22		-6		80
	Total increase/(decrease) in net income	$	—	$	29	$	7	$	-121
	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.

Income_Tax

Income Tax	6 Months Ended
	Jun. 30, 2014
Income Tax	'
	Note J — Income Tax
	Con Edison’s income tax expense increased by $37 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013. The effective tax rate for the three months ended June 30, 2014 and 2013 was 32 percent and 27 percent, respectively. The increase in the effective tax rate was primarily attributable to lower flow-through tax deductions related to plant in the 2014 period than in the 2013 period. The lower effective tax rate in 2013 also reflected more favorable rate reconciling items related to plant.
	Con Edison’s income tax expense increased by $178 million for the six months ended June 30, 2014, compared to the six months ended June 30, 2013. The effective tax rate for the six months ended June 30, 2014 and 2013 was 34 percent and 25 percent, respectively. The increase in the effective tax rate was primarily attributable to lower flow-through tax deductions related to plant in the 2014 period than in the 2013 period. Additionally, in the first quarter of 2013, the IRS accepted on audit the Company’s claim for a manufacturing tax deduction, which reduced its income tax expense by $15 million.
	CECONY’s income tax expense increased by $21 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013. The effective tax rate for the three months ended June 30, 2014 and 2013 was 31 percent and 27 percent, respectively. The increase in CECONY’s effective tax rate is due primarily to higher amortization of New York State’s Metropolitan Transportation Authority business tax and lower flow-through tax deductions related to plant in the 2014 period than in the 2013 period. CECONY’s income tax expense increased by $53 million for the six months ended June 30, 2014, compared to the six months ended June 30, 2013. The effective tax for the six months ended June 30, 2014 and 2013 was 34 percent and 33 percent, respectively.
	In March 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 $80 million ($75 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 $69 million ($65 million for CECONY). The impact of this tax legislation on Con Edison’s effective tax rate was not material and there was no impact on CECONY’s effective tax rate for the six months ended June 30, 2014.
	Uncertain Tax Positions
	In 2014, Con Edison filed various amended state tax returns to reflect its June 2013 closing agreement with the IRS regarding the 1997 and 1999 LILO transactions (see Note I). As a result of positions taken on the amended state tax returns, 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 June 30, 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 six months ended June 30, 2014, Con Edison recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in its consolidated income statements. In the six months ended June 30, 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 June 30, 2014 and December 31, 2013, Con Edison recognized an immaterial amount of accrued interest on its consolidated balance sheets.
	As of June 30, 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 reduce Con Edison’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $31 million ($20 million, net of federal taxes).
CECONY [Member]	'
Income Tax	'
	Note J — Income Tax
	Con Edison’s income tax expense increased by $37 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013. The effective tax rate for the three months ended June 30, 2014 and 2013 was 32 percent and 27 percent, respectively. The increase in the effective tax rate was primarily attributable to lower flow-through tax deductions related to plant in the 2014 period than in the 2013 period. The lower effective tax rate in 2013 also reflected more favorable rate reconciling items related to plant.
	Con Edison’s income tax expense increased by $178 million for the six months ended June 30, 2014, compared to the six months ended June 30, 2013. The effective tax rate for the six months ended June 30, 2014 and 2013 was 34 percent and 25 percent, respectively. The increase in the effective tax rate was primarily attributable to lower flow-through tax deductions related to plant in the 2014 period than in the 2013 period. Additionally, in the first quarter of 2013, the IRS accepted on audit the Company’s claim for a manufacturing tax deduction, which reduced its income tax expense by $15 million.
	CECONY’s income tax expense increased by $21 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013. The effective tax rate for the three months ended June 30, 2014 and 2013 was 31 percent and 27 percent, respectively. The increase in CECONY’s effective tax rate is due primarily to higher amortization of New York State’s Metropolitan Transportation Authority business tax and lower flow-through tax deductions related to plant in the 2014 period than in the 2013 period. CECONY’s income tax expense increased by $53 million for the six months ended June 30, 2014, compared to the six months ended June 30, 2013. The effective tax for the six months ended June 30, 2014 and 2013 was 34 percent and 33 percent, respectively.
	In March 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 $80 million ($75 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 $69 million ($65 million for CECONY). The impact of this tax legislation on Con Edison’s effective tax rate was not material and there was no impact on CECONY’s effective tax rate for the six months ended June 30, 2014.
	Uncertain Tax Positions
	In 2014, Con Edison filed various amended state tax returns to reflect its June 2013 closing agreement with the IRS regarding the 1997 and 1999 LILO transactions (see Note I). As a result of positions taken on the amended state tax returns, 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 June 30, 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 six months ended June 30, 2014, Con Edison recognized an immaterial amount of interest expense and no penalties for uncertain tax positions in its consolidated income statements. In the six months ended June 30, 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 June 30, 2014 and December 31, 2013, Con Edison recognized an immaterial amount of accrued interest on its consolidated balance sheets.
	As of June 30, 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 reduce Con Edison’s effective tax rate. The total amount of unrecognized tax benefits, if recognized, that would reduce Con Edison’s effective tax rate is $31 million ($20 million, net of federal taxes).

Financial_Information_by_Busin

Financial Information by Business Segment	6 Months Ended
	Jun. 30, 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 June 30,
			Operating						Inter-segment						Depreciation and					Operating
			revenues						revenues						amortization					income
	(Millions of Dollars)		2014			2013			2014			2013			2014			2013		2014			2013
	CECONY
	Electric		$	1,978		$	1,872		$	4		$	4		$	195		$	186	$	347		$	307
	Gas			360			331			2			2			33			32		54			53
	Steam			98			118			21			19			19			17		(15	)		(14	)
	Consolidation adjustments			—			—			(27	)		(25	)		—			—		—			—
	Total CECONY		$	2,436		$	2,321		$	—		$	—		$	247		$	235	$	386		$	346
	O&R
	Electric		$	157		$	146		$	—		$	—		$	11		$	10	$	25		$	14
	Gas			35			35			—			—			4			4		(5	)		(1	)
	Total O&R		$	192		$	181		$	—		$	—		$	15		$	14	$	20		$	13
	Competitive energy businesses		$	284		$	317		$	(1	)	$	2		$	4		$	5	$	48		$	27
	Other*			(1	)		(1	)		1			(2	)		(1	)		1		1			—
	Total Con Edison		$	2,911		$	2,818		$	—		$	—		$	265		$	255	$	455		$	386
	*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.
			For the Six Months Ended June 30,
			Operating						Inter-segment						Depreciation and					Operating
			revenues						revenues						amortization					income
	(Millions of Dollars)		2014			2013			2014			2013			2014			2013		2014			2013
	CECONY
	Electric		$	4,053		$	3,686		$	8		$	8		$	383		$	371	$	605		$	495
	Gas			1,149			991			3			3			64			64		287			296
	Steam			439			450			41			38			39			33		138			115
	Consolidation adjustments			—			—			(52	)		(49	)		—			—		—			—
	Total CECONY		$	5,641		$	5,127		$	—		$	—		$	486		$	468	$	1,030		$	906
	O&R
	Electric		$	320		$	291		$	—		$	—		$	21		$	20	$	37		$	34
	Gas			128			117			—			—			8			8		22			27
	Total O&R		$	448		$	408		$	—		$	—		$	29		$	28	$	59		$	61
	Competitive energy businesses		$	612		$	469		$	1		$	4		$	11		$	10	$	50		$	(56	)
	Other*			(1	)		(1	)		(1	)		(4	)		—			—		1			1
	Total Con Edison		$	6,700		$	6,003		$	—		$	—		$	526		$	506	$	1,140		$	912
	*	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 June 30,
			Operating						Inter-segment						Depreciation and					Operating
			revenues						revenues						amortization					income
	(Millions of Dollars)		2014			2013			2014			2013			2014			2013		2014			2013
	CECONY
	Electric		$	1,978		$	1,872		$	4		$	4		$	195		$	186	$	347		$	307
	Gas			360			331			2			2			33			32		54			53
	Steam			98			118			21			19			19			17		(15	)		(14	)
	Consolidation adjustments			—			—			(27	)		(25	)		—			—		—			—
	Total CECONY		$	2,436		$	2,321		$	—		$	—		$	247		$	235	$	386		$	346
	O&R
	Electric		$	157		$	146		$	—		$	—		$	11		$	10	$	25		$	14
	Gas			35			35			—			—			4			4		(5	)		(1	)
	Total O&R		$	192		$	181		$	—		$	—		$	15		$	14	$	20		$	13
	Competitive energy businesses		$	284		$	317		$	(1	)	$	2		$	4		$	5	$	48		$	27
	Other*			(1	)		(1	)		1			(2	)		(1	)		1		1			—
	Total Con Edison		$	2,911		$	2,818		$	—		$	—		$	265		$	255	$	455		$	386
	*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.
			For the Six Months Ended June 30,
			Operating						Inter-segment						Depreciation and					Operating
			revenues						revenues						amortization					income
	(Millions of Dollars)		2014			2013			2014			2013			2014			2013		2014			2013
	CECONY
	Electric		$	4,053		$	3,686		$	8		$	8		$	383		$	371	$	605		$	495
	Gas			1,149			991			3			3			64			64		287			296
	Steam			439			450			41			38			39			33		138			115
	Consolidation adjustments			—			—			(52	)		(49	)		—			—		—			—
	Total CECONY		$	5,641		$	5,127		$	—		$	—		$	486		$	468	$	1,030		$	906
	O&R
	Electric		$	320		$	291		$	—		$	—		$	21		$	20	$	37		$	34
	Gas			128			117			—			—			8			8		22			27
	Total O&R		$	448		$	408		$	—		$	—		$	29		$	28	$	59		$	61
	Competitive energy businesses		$	612		$	469		$	1		$	4		$	11		$	10	$	50		$	(56	)
	Other*			(1	)		(1	)		(1	)		(4	)		—			—		1			1
	Total Con Edison		$	6,700		$	6,003		$	—		$	—		$	526		$	506	$	1,140		$	912
	*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 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 June 30, 2014 were:
	(Millions of Dollars)
	Commodity Derivatives		Gross				Gross Amounts				Net Amounts of			Gross Amounts Not				Net
			Amounts of				Offset in the				Assets/(Liabilities)			Offset in the Statement				Amount
			Recognized				Statement of				Presented in			of Financial Position
			Assets/(Liabilities)				Financial Position				the Statement
											of Financial
											Position
														Financial		Cash
														instruments		collateral
																received
	Con Edison
	Derivative assets		$	242			$	(127	)		$	115	(a)	$	—	$	—	$	115	(a)
	Derivative liabilities			(110	)			100				(10	)		—		—		(10	)
	Net derivative assets/(liabilities)		$	132			$	(27	)		$	105	(a)	$	—	$	—	$	105	(a)
	CECONY
	Derivative assets		$	95			$	(45	)		$	50	(a)	$	—	$	—	$	50	(a)
	Derivative liabilities			(49	)			43				-6			—		—		-6
	Net derivative assets/(liabilities)		$	46			$	(2	)		$	44	(a)	$	—	$	—	$	44	(a)
	(a)	At June 30, 2014, Con Edison and CECONY had margin deposits of $2 million and $1 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				Gross Amounts				Net Amounts of			Gross Amounts Not				Net
			Amounts of				Offset in the				Assets/(Liabilities)			Offset in the Statement				Amount
			Recognized				Statement of				Presented in			of Financial Position
			Assets/(Liabilities)				Financial Position				the Statement
											of Financial
											Position
														Financial		Cash
														instruments		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 June 30, 2014, Con Edison and CECONY had $141 million and $26 million of credit exposure in connection with energy supply and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $47 million with independent system operators, $49 million with commodity exchange brokers, $43 million with investment-grade counterparties and $2 million with non-investment grade/non-rated counterparties. CECONY’s net credit exposure consisted of $15 million with commodity exchange brokers and $11 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 June 30, 2014 were:
	(Millions of Dollars)		Fair Value of Commodity Derivatives(a)		Con Edison				CECONY
			Balance Sheet Location
	Derivative Assets
	Current		Other current assets		$	190			$	69
	Noncurrent		Other deferred charges and noncurrent assets			52				26
	Total derivative assets				$	242			$	95
	Impact of netting					(125	)			(44	)
	Net derivative assets				$	117			$	51
	Derivative Liabilities
	Current		Fair value of derivative liabilities		$	72			$	25
	Noncurrent		Fair value of derivative liabilities			38				24
	Total derivative liabilities				$	110			$	49
Impact of netting					(100	)			(43	)
Net derivative liabilities				$	10			$	6
(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)		Con Edison				CECONY
		Balance Sheet Location
Derivative Assets
Current		Other current assets		$	134			$	27
Noncurrent		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
Noncurrent		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 and six months ended June 30, 2014:
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Three Months Ended June 30, 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		$	1			$	1
Noncurrent		Deferred derivative gains			2				2
Total deferred gains/(losses)				$	3			$	3
Current		Deferred derivative losses		$	(2	)		$	(2	)
Current		Recoverable energy costs			(7	)			(6	)
Noncurrent		Deferred derivative losses			(3	)			(3	)
Total deferred gains/(losses)				$	(12	)		$	(11	)
Net deferred gains/(losses)				$	(9	)		$	(8	)
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	(13	)(b)		$	—
		Gas purchased for resale			(32	)			—
		Non-utility revenue			14	(b)			—
Total pre-tax gain/(loss) recognized in income				$	(31	)		$	—
(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 June 30, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax loss of $(5) million.
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Six Months Ended June 30, 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		$	31			$	25
Noncurrent		Deferred derivative gains			7				6
Total deferred gains/(losses)				$	38			$	31
Current		Deferred derivative losses		$	15			$	15
Current		Recoverable energy costs			87				70
Noncurrent		Deferred derivative losses			—				(1	)
Total deferred gains/(losses)				$	102			$	84
Net deferred gains/(losses)				$	140			$	115
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	161	(b)		$	—
		Gas purchased for resale			(46	)			—
		Non-utility revenue			(10	)(b)			—
Total pre-tax gain/(loss) recognized in income				$	105			$	—
(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 six months ended June 30, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $15 million.
The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2013:
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Three Months Ended June 30, 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		$	(7	)		$	(7	)
Noncurrent		Regulatory liabilities			(2	)			(1	)
Total deferred gains/(losses)				$	(9	)		$	(8	)
Current		Deferred derivative losses		$	(24	)		$	(23	)
Current		Recoverable energy costs			(14	)			(12	)
Noncurrent		Deferred derivative losses			(10	)			(6	)
Total deferred gains/(losses)				$	-48			$	-41
Net deferred gains/(losses)				$	-57			$	-49
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	(37	)(b)		$	—
		Gas purchased for resale			(7	)			—
		Non-utility revenue			2	(b)			—
Total pre-tax gain/(loss) recognized in income				$	(42	)		$	—
(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 June 30, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax loss of $(1) million and $(29) million, respectively.
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Six Months Ended June 30, 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		$	2			$	1
Noncurrent		Regulatory liabilities			—				—
Total deferred gains/(losses)				$	2			$	1
Current		Deferred derivative losses		$	14			$	9
Current		Recoverable energy costs			(3	)			(2	)
Noncurrent		Deferred derivative losses			(3	)			—
Total deferred gains/(losses)				$	8			$	7
Net deferred gains/(losses)				$	10			$	8
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	30	(b)		$	—
		Gas purchased for resale			(11	)			—
		Non-utility revenue			1	(b)			—
Total pre-tax gain/(loss) recognized in income				$	20			$	—
(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 six months ended June 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $16 million.
As of June 30, 2014, Con Edison had 1,285 contracts, including 576 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				MWHs (b)				Number of			MWs (b)		Number of		Dths (b)			Total
		Energy								Capacity					Contracts (a)					Number Of
		Contracts (a)								Contracts (a)										Contracts (a)
Con Edison			557				14,772,012				65			5,430		663		73,289,826			1,285
CECONY			88				3,500,475				4			600		484		64,760,000			576
(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 June 30, 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)		$	—			$	—
Additional collateral(b) (downgrade to below investment grade from current ratings)		$	9	(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 June 30, 2014, would have amounted to an estimated $17 million for Con Edison, including $5 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 June 30, 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 $45 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 June 30, 2014 was an unrealized loss of $1 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 and six months ended June 30, 2014 was $1 million. In the event O&R’s credit rating is 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 does 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
	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 June 30, 2014 were:
	(Millions of Dollars)
	Commodity Derivatives		Gross				Gross Amounts				Net Amounts of			Gross Amounts Not				Net
			Amounts of				Offset in the				Assets/(Liabilities)			Offset in the Statement				Amount
			Recognized				Statement of				Presented in			of Financial Position
			Assets/(Liabilities)				Financial Position				the Statement
											of Financial
											Position
														Financial		Cash
														instruments		collateral
																received
	Con Edison
	Derivative assets		$	242			$	(127	)		$	115	(a)	$	—	$	—	$	115	(a)
	Derivative liabilities			(110	)			100				(10	)		—		—		(10	)
	Net derivative assets/(liabilities)		$	132			$	(27	)		$	105	(a)	$	—	$	—	$	105	(a)
	CECONY
	Derivative assets		$	95			$	(45	)		$	50	(a)	$	—	$	—	$	50	(a)
	Derivative liabilities			(49	)			43				-6			—		—		-6
	Net derivative assets/(liabilities)		$	46			$	(2	)		$	44	(a)	$	—	$	—	$	44	(a)
	(a)	At June 30, 2014, Con Edison and CECONY had margin deposits of $2 million and $1 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				Gross Amounts				Net Amounts of			Gross Amounts Not				Net
			Amounts of				Offset in the				Assets/(Liabilities)			Offset in the Statement				Amount
			Recognized				Statement of				Presented in			of Financial Position
			Assets/(Liabilities)				Financial Position				the Statement
											of Financial
											Position
														Financial		Cash
														instruments		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 June 30, 2014, Con Edison and CECONY had $141 million and $26 million of credit exposure in connection with energy supply and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $47 million with independent system operators, $49 million with commodity exchange brokers, $43 million with investment-grade counterparties and $2 million with non-investment grade/non-rated counterparties. CECONY’s net credit exposure consisted of $15 million with commodity exchange brokers and $11 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 June 30, 2014 were:
	(Millions of Dollars)		Fair Value of Commodity Derivatives(a)		Con Edison				CECONY
			Balance Sheet Location
	Derivative Assets
	Current		Other current assets		$	190			$	69
	Noncurrent		Other deferred charges and noncurrent assets			52				26
	Total derivative assets				$	242			$	95
	Impact of netting					(125	)			(44	)
	Net derivative assets				$	117			$	51
	Derivative Liabilities
	Current		Fair value of derivative liabilities		$	72			$	25
	Noncurrent		Fair value of derivative liabilities			38				24
	Total derivative liabilities				$	110			$	49
Impact of netting					(100	)			(43	)
Net derivative liabilities				$	10			$	6
(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)		Con Edison				CECONY
		Balance Sheet Location
Derivative Assets
Current		Other current assets		$	134			$	27
Noncurrent		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
Noncurrent		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 and six months ended June 30, 2014:
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Three Months Ended June 30, 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		$	1			$	1
Noncurrent		Deferred derivative gains			2				2
Total deferred gains/(losses)				$	3			$	3
Current		Deferred derivative losses		$	(2	)		$	(2	)
Current		Recoverable energy costs			(7	)			(6	)
Noncurrent		Deferred derivative losses			(3	)			(3	)
Total deferred gains/(losses)				$	(12	)		$	(11	)
Net deferred gains/(losses)				$	(9	)		$	(8	)
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	(13	)(b)		$	—
		Gas purchased for resale			(32	)			—
		Non-utility revenue			14	(b)			—
Total pre-tax gain/(loss) recognized in income				$	(31	)		$	—
(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 June 30, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax loss of $(5) million.
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Six Months Ended June 30, 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		$	31			$	25
Noncurrent		Deferred derivative gains			7				6
Total deferred gains/(losses)				$	38			$	31
Current		Deferred derivative losses		$	15			$	15
Current		Recoverable energy costs			87				70
Noncurrent		Deferred derivative losses			—				(1	)
Total deferred gains/(losses)				$	102			$	84
Net deferred gains/(losses)				$	140			$	115
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	161	(b)		$	—
		Gas purchased for resale			(46	)			—
		Non-utility revenue			(10	)(b)			—
Total pre-tax gain/(loss) recognized in income				$	105			$	—
(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 six months ended June 30, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $15 million.
The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2013:
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Three Months Ended June 30, 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		$	(7	)		$	(7	)
Noncurrent		Regulatory liabilities			(2	)			(1	)
Total deferred gains/(losses)				$	(9	)		$	(8	)
Current		Deferred derivative losses		$	(24	)		$	(23	)
Current		Recoverable energy costs			(14	)			(12	)
Noncurrent		Deferred derivative losses			(10	)			(6	)
Total deferred gains/(losses)				$	-48			$	-41
Net deferred gains/(losses)				$	-57			$	-49
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	(37	)(b)		$	—
		Gas purchased for resale			(7	)			—
		Non-utility revenue			2	(b)			—
Total pre-tax gain/(loss) recognized in income				$	(42	)		$	—
(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 June 30, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax loss of $(1) million and $(29) million, respectively.
Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Six Months Ended June 30, 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		$	2			$	1
Noncurrent		Regulatory liabilities			—				—
Total deferred gains/(losses)				$	2			$	1
Current		Deferred derivative losses		$	14			$	9
Current		Recoverable energy costs			(3	)			(2	)
Noncurrent		Deferred derivative losses			(3	)			—
Total deferred gains/(losses)				$	8			$	7
Net deferred gains/(losses)				$	10			$	8
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	30	(b)		$	—
		Gas purchased for resale			(11	)			—
		Non-utility revenue			1	(b)			—
Total pre-tax gain/(loss) recognized in income				$	20			$	—
(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 six months ended June 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $16 million.
As of June 30, 2014, Con Edison had 1,285 contracts, including 576 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				MWHs (b)				Number of			MWs (b)		Number of		Dths (b)			Total
		Energy								Capacity					Contracts (a)					Number Of
		Contracts (a)								Contracts (a)										Contracts (a)
Con Edison			557				14,772,012				65			5,430		663		73,289,826			1,285
CECONY			88				3,500,475				4			600		484		64,760,000			576
(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 June 30, 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)		$	—			$	—
Additional collateral(b) (downgrade to below investment grade from current ratings)		$	9	(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 June 30, 2014, would have amounted to an estimated $17 million for Con Edison, including $5 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 June 30, 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 $45 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 June 30, 2014 was an unrealized loss of $1 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 and six months ended June 30, 2014 was $1 million. In the event O&R’s credit rating is 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 does so, the parties would then be required to settle the transaction.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 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 June 30, 2014 are summarized below.
			Level 1					Level 2					Level 3				Netting						Total
																	Adjustments (d)
	(Millions of Dollars)		Con		CECONY			Con			CECONY		Con		CECONY		Con			CECONY			Con		CECONY
			Edison					Edison					Edison				Edison						Edison
	Derivative assets:
	Commodity (a)(e)(f)		$	7	$	5		$	166		$	43	$	28	$	14	$	(84	)	$	(11	)	$	117	$	51
	Other assets (c)(e)(f)			160		153			116			105		—		—		—			—			276		258
	Total		$	167	$	158		$	282		$	148	$	28	$	14	$	(84	)	$	(11	)	$	393	$	309
	Derivative liabilities:
	Commodity (a)(e)(f)		$	5	$	3		$	63		$	13	$	1	$	—	$	-59		$	-10		$	10	$	6
	Interest rate contract (b)(e)(f)			—		—			1			—		—		—		—			—			1		—
	Total		$	5	$	3		$	64		$	13	$	1	$	—	$	-59		$	-10		$	11	$	6
	(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 six months ended June 30, 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						Total
																	Adjustments (d)
	(Millions of Dollars)		Con		CECONY			Con			CECONY		Con		CECONY		Con			CECONY			Con		CECONY
			Edison					Edison					Edison				Edison						Edison
	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)	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.
	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		Valuation		Unobservable Inputs	Range
			3 at		Techniques
			June 30, 2014
			(Millions of Dollars)
	Con Edison—Commodity
	Electricity			$10	Discounted Cash Flow		Forward energy prices (a)	$28.93-$150.25 per MWH
					Discounted Cash Flow		Forward capacity prices (a)	$5.25-$18.69 per kW-month
	Transmission Congestion Contracts / Financial Transmission Rights			17	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)	6.1%-49.1%
							Inter-zonal forward price curves adjusted for historical zonal losses (b)	$0.32-$11.24 per MWh
	Total Con Edison—Commodity			$27
	CECONY—Commodity
	Transmission Congestion Contracts			$14	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)	6.1%-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 June 30, 2014 and 2013 and classified as Level 3 in the fair value hierarchy:
			For the Three Months Ended June 30, 2014
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		1-Apr-14					and Liabilities												Level 3			June 30, 2014
Con Edison
Derivatives:
Commodity			$24		($2)			$3			$3		$—		$—		($1)			$—			$27
CECONY
Derivatives:
Commodity			$13		($2)			$3			$2		$—		$—		($2)			$—			$14
		For the Six Months Ended June 30, 2014
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		January 1, 2014					and Liabilities												Level 3			June 30, 2014
Con Edison
Derivatives:
Commodity			$9		$49			$7			$11		$—		$—		($49)			$—			$27
CECONY
Derivatives:
Commodity			$6		$9			$7			$9		$—		$—		($17)			$—			$14
		For Three Months Ended June 30, 2013
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		1-Apr-13					and Liabilities												Level 3			June 30, 2013
Con Edison
Derivatives:
Commodity		$	14	$	(21	)	$	(2	)	$	2	$	—	$	—	$	1		$	—		$	-6
CECONY
Derivatives:
Commodity		$	11	$	(2	)	$	—		$	1	$	—	$	—	$	-2		$	—		$	8
		For Six Months Ended June 30, 2013
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		January 1, 2013					and Liabilities												Level 3			June 30, 2013
Con Edison
Derivatives:
Commodity		$	-5	$	8		$	3		$	7	$	—	$	—	$	-19		$	—		$	-6
CECONY
Derivatives:
Commodity		$	10	$	7		$	1		$	5	$	—	$	—	$	-15		$	—		$	8
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 $2 million loss) and purchased power costs (immaterial and $15 million loss) on the consolidated income statement for the three months ended June 30, 2014 and 2013, respectively. Realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($40 million gain and $4 million gain) on the consolidated income statement for the six months ended June 30, 2014 and 2013, respectively. The change in fair value relating to Level 3 commodity derivative assets and liabilities held at June 30, 2014 and 2013 is included in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($2 million gain and $14 million loss) on the consolidated income statement for the three months ended June 30, 2014 and 2013, respectively. For the six months ended June 30, 2014 and 2013, the change in fair value relating to Level 3 commodity derivative assets and liabilities is included in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($11 million gain and $2 million gain) on the consolidated income statement, 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 June 30, 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
	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 June 30, 2014 are summarized below.
			Level 1					Level 2					Level 3				Netting						Total
																	Adjustments (d)
	(Millions of Dollars)		Con		CECONY			Con			CECONY		Con		CECONY		Con			CECONY			Con		CECONY
			Edison					Edison					Edison				Edison						Edison
	Derivative assets:
	Commodity (a)(e)(f)		$	7	$	5		$	166		$	43	$	28	$	14	$	(84	)	$	(11	)	$	117	$	51
	Other assets (c)(e)(f)			160		153			116			105		—		—		—			—			276		258
	Total		$	167	$	158		$	282		$	148	$	28	$	14	$	(84	)	$	(11	)	$	393	$	309
	Derivative liabilities:
	Commodity (a)(e)(f)		$	5	$	3		$	63		$	13	$	1	$	—	$	-59		$	-10		$	10	$	6
	Interest rate contract (b)(e)(f)			—		—			1			—		—		—		—			—			1		—
	Total		$	5	$	3		$	64		$	13	$	1	$	—	$	-59		$	-10		$	11	$	6
	(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 six months ended June 30, 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						Total
																	Adjustments (d)
	(Millions of Dollars)		Con		CECONY			Con			CECONY		Con		CECONY		Con			CECONY			Con		CECONY
			Edison					Edison					Edison				Edison						Edison
	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)	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.
	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		Valuation		Unobservable Inputs	Range
			3 at		Techniques
			June 30, 2014
			(Millions of Dollars)
	Con Edison—Commodity
	Electricity			$10	Discounted Cash Flow		Forward energy prices (a)	$28.93-$150.25 per MWH
					Discounted Cash Flow		Forward capacity prices (a)	$5.25-$18.69 per kW-month
	Transmission Congestion Contracts / Financial Transmission Rights			17	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)	6.1%-49.1%
							Inter-zonal forward price curves adjusted for historical zonal losses (b)	$0.32-$11.24 per MWh
	Total Con Edison—Commodity			$27
	CECONY—Commodity
	Transmission Congestion Contracts			$14	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)	6.1%-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 June 30, 2014 and 2013 and classified as Level 3 in the fair value hierarchy:
			For the Three Months Ended June 30, 2014
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		1-Apr-14					and Liabilities												Level 3			June 30, 2014
Con Edison
Derivatives:
Commodity			$24		($2)			$3			$3		$—		$—		($1)			$—			$27
CECONY
Derivatives:
Commodity			$13		($2)			$3			$2		$—		$—		($2)			$—			$14
		For the Six Months Ended June 30, 2014
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		January 1, 2014					and Liabilities												Level 3			June 30, 2014
Con Edison
Derivatives:
Commodity			$9		$49			$7			$11		$—		$—		($49)			$—			$27
CECONY
Derivatives:
Commodity			$6		$9			$7			$9		$—		$—		($17)			$—			$14
		For Three Months Ended June 30, 2013
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		1-Apr-13					and Liabilities												Level 3			June 30, 2013
Con Edison
Derivatives:
Commodity		$	14	$	(21	)	$	(2	)	$	2	$	—	$	—	$	1		$	—		$	-6
CECONY
Derivatives:
Commodity		$	11	$	(2	)	$	—		$	1	$	—	$	—	$	-2		$	—		$	8
		For Six Months Ended June 30, 2013
				Total Gains/(Losses)—
				Realized and Unrealized
(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
		Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
		January 1, 2013					and Liabilities												Level 3			June 30, 2013
Con Edison
Derivatives:
Commodity		$	-5	$	8		$	3		$	7	$	—	$	—	$	-19		$	—		$	-6
CECONY
Derivatives:
Commodity		$	10	$	7		$	1		$	5	$	—	$	—	$	-15		$	—		$	8
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 $2 million loss) and purchased power costs (immaterial and $15 million loss) on the consolidated income statement for the three months ended June 30, 2014 and 2013, respectively. Realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($40 million gain and $4 million gain) on the consolidated income statement for the six months ended June 30, 2014 and 2013, respectively. The change in fair value relating to Level 3 commodity derivative assets and liabilities held at June 30, 2014 and 2013 is included in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($2 million gain and $14 million loss) on the consolidated income statement for the three months ended June 30, 2014 and 2013, respectively. For the six months ended June 30, 2014 and 2013, the change in fair value relating to Level 3 commodity derivative assets and liabilities is included in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($11 million gain and $2 million gain) on the consolidated income statement, 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 June 30, 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.

Variable_Interest_Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 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 June 30, 2014, Con Edison’s consolidated balance sheet includes $123 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.
	In May 2014, Con Edison Development sold 50 percent of its membership interest in CED California Holdings Financing I, LLC (CCH), which was previously a wholly owned subsidiary. As a result, at June 30, 2014, Con Edison has a variable interest in CCH, which is no longer a consolidated entity. CCH owns project companies that operate 110 MW (AC) of solar energy projects in California. Electricity generated by the projects is sold to Pacific Gas and Electric Company pursuant to long-term power purchase agreements. Con Edison is not the primary beneficiary since the power to direct the activities that most significantly impact the economics of CCH is shared equally between Con Edison Development and a third party. Con Edison Development’s remaining 50 percent interest in CCH is now accounted for under the equity method.
	As a result of the sale, Con Edison Development received net proceeds of $108 and recognized a pre-tax gain on the sale of $45 million ($26 million, net of tax). The following table summarizes the sale and resultant deconsolidation on the transaction date:
	(Millions of Dollars)
	Proceeds from sale, net of transaction costs of $1	$	108
	Non-utility property, less accumulated depreciation		(341	)
	Other assets, including working capital		(31	)
	Long-term debt, including current portion		217
	Other liabilities		9
	Gain on sale of solar energy projects		(45	)
	Equity method investment upon deconsolidation	$	(83	)
	At June 30, 2014, Con Edison’s consolidated balance sheet includes $85 million in investments (including earnings) related to CCH, which assessed in accordance with the accounting rules for variable interest entities, is Con Edison’s current maximum exposure to loss in the entity.
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 June 30, 2014, Con Edison’s consolidated balance sheet includes $123 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.
	In May 2014, Con Edison Development sold 50 percent of its membership interest in CED California Holdings Financing I, LLC (CCH), which was previously a wholly owned subsidiary. As a result, at June 30, 2014, Con Edison has a variable interest in CCH, which is no longer a consolidated entity. CCH owns project companies that operate 110 MW (AC) of solar energy projects in California. Electricity generated by the projects is sold to Pacific Gas and Electric Company pursuant to long-term power purchase agreements. Con Edison is not the primary beneficiary since the power to direct the activities that most significantly impact the economics of CCH is shared equally between Con Edison Development and a third party. Con Edison Development’s remaining 50 percent interest in CCH is now accounted for under the equity method.
	As a result of the sale, Con Edison Development received net proceeds of $108 and recognized a pre-tax gain on the sale of $45 million ($26 million, net of tax). The following table summarizes the sale and resultant deconsolidation on the transaction date:
	(Millions of Dollars)
	Proceeds from sale, net of transaction costs of $1	$	108
	Non-utility property, less accumulated depreciation		(341	)
	Other assets, including working capital		(31	)
	Long-term debt, including current portion		217
	Other liabilities		9
	Gain on sale of solar energy projects		(45	)
	Equity method investment upon deconsolidation	$	(83	)
	At June 30, 2014, Con Edison’s consolidated balance sheet includes $85 million in investments (including earnings) related to CCH, which assessed in accordance with the accounting rules for variable interest entities, is Con Edison’s current maximum exposure to loss in the entity.

New_Financial_Accounting_Stand

New Financial Accounting Standards	6 Months Ended
	Jun. 30, 2014
New Financial Accounting Standards	'
	Note O — New Financial Accounting Standards
	In April 2014, the Financial Accounting Standards Board (FASB) issued new amendments on reporting discontinued operations through Accounting Standards Update (ASU) No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” The amendments in this update revise the definition of a discontinued operation as a disposal of a component of an entity or a group of components of an entity, or a business or nonprofit activity that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results. The amendments also require additional disclosures for discontinued operations and individually significant disposals that do not qualify for discontinued operations presentation in the financial statements. For public entities, the amendments are effective prospectively for reporting periods beginning on or after December 15, 2014. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity.
	In May 2014, the FASB and the International Accounting Standards Board (IASB) jointly issued a new revenue recognition standard that will supersede the revenue recognition requirements within Accounting Standards Codification (ASC) Topic 605, “Revenue Recognition,” and most industry-specific guidance under the Codification through ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” The purpose of the new guidance is to create a consistent framework for revenue recognition. The guidance clarifies how to measure and recognize revenue arising from customer contracts to depict the transfer of goods or services in an amount that reflects the consideration the entity expects to receive. The new guidance must be adopted using either a full retrospective approach or a modified retrospective approach. For public entities reporting under US GAAP, the new guidance is effective for periods beginning after December 15, 2016. The Companies are in the process of evaluating the application and impact of the new guidance on the Companies’ financial position, results of operations and liquidity.
	In June 2014, the FASB issued ASU No. 2014-12, “Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” The purpose of the amendments is to clarify the accounting treatment regarding performance targets. Under the new guidance, a performance target that affects vesting and that could be achieved after the requisite service period is required to be treated as a performance condition and should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized only when it becomes probable that the performance target will be achieved. The amendments are effective for periods beginning after December 15, 2015. The Companies are in the process of evaluating the application and impact of the new guidance on the Companies’ financial position, results of operations and liquidity.
CECONY [Member]	'
New Financial Accounting Standards	'
	Note O — New Financial Accounting Standards
	In April 2014, the Financial Accounting Standards Board (FASB) issued new amendments on reporting discontinued operations through Accounting Standards Update (ASU) No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” The amendments in this update revise the definition of a discontinued operation as a disposal of a component of an entity or a group of components of an entity, or a business or nonprofit activity that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results. The amendments also require additional disclosures for discontinued operations and individually significant disposals that do not qualify for discontinued operations presentation in the financial statements. For public entities, the amendments are effective prospectively for reporting periods beginning on or after December 15, 2014. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity.
	In May 2014, the FASB and the International Accounting Standards Board (IASB) jointly issued a new revenue recognition standard that will supersede the revenue recognition requirements within Accounting Standards Codification (ASC) Topic 605, “Revenue Recognition,” and most industry-specific guidance under the Codification through ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” The purpose of the new guidance is to create a consistent framework for revenue recognition. The guidance clarifies how to measure and recognize revenue arising from customer contracts to depict the transfer of goods or services in an amount that reflects the consideration the entity expects to receive. The new guidance must be adopted using either a full retrospective approach or a modified retrospective approach. For public entities reporting under US GAAP, the new guidance is effective for periods beginning after December 15, 2016. The Companies are in the process of evaluating the application and impact of the new guidance on the Companies’ financial position, results of operations and liquidity.
	In June 2014, the FASB issued ASU No. 2014-12, “Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” The purpose of the amendments is to clarify the accounting treatment regarding performance targets. Under the new guidance, a performance target that affects vesting and that could be achieved after the requisite service period is required to be treated as a performance condition and should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized only when it becomes probable that the performance target will be achieved. The amendments are effective for periods beginning after December 15, 2015. The Companies are in the process of evaluating the application and impact of the new guidance on the Companies’ financial position, results of operations and liquidity.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Earnings per Common Share	'
	Earnings Per Common Share
	For the three and six months ended June 30, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:
			For the Three Months						For the Six Months
			Ended June 30,						Ended June 30,
	(Millions of Dollars, except per share amounts/Shares in Millions)		2014			2013			2014			2013
	Net income for common stock		$	212		$	172		$	574		$	364
	Weighted average common shares outstanding – basic			292.9			292.9			292.9			292.9
	Add: Incremental shares attributable to effect of potentially dilutive securities			1.1			1.4			1.1			1.4
	Adjusted weighted average common shares outstanding – diluted			294			294.3			294			294.3
	Net Income for common stock per common share – basic		$	0.73		$	0.59		$	1.96		$	1.24
	Net Income for common stock per common share – diluted		$	0.72		$	0.59		$	1.95		$	1.24
	The computation of diluted EPS for the three and six months ended June 30, 2014 and 2013 excludes immaterial amounts of performance share awards which were not included because of their anti-dilutive effect.
Changes in Accumulated Other Comprehensive Income by Component	'
	Changes in Accumulated Other Comprehensive Income by Component
	For the three and six months ended June 30, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:
			For the Three Months Ended June 30,
			Con Edison						CECONY
	(Millions of Dollars)		2014			2013			2014			2013
	Beginning balance, accumulated OCI, net of taxes		$	(21	)	$	(50	)	$	(5	)	$	(9	)
	OCI before reclassifications, net of tax of $- and $- for both Con Edison and CECONY			—			—			—			—
	Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively (a)(b)			1			2			—			—
	Current period total OCI, net of taxes		$	1		$	2		$	—		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
			For the Six Months Ended June 30,
			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 and other postretirement benefit plan liabilities, net of tax of $2 and $2 for Con Edison and $- and $- for CECONY, respectively (a)(b)			3			4			1			—
	Current period total OCI, net of taxes		$	5		$	5		$	1		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
	(a)	For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of net periodic pension and other postretirement benefit cost. See Notes E and F.
	(b)	Tax reclassified from accumulated OCI is reported in income tax expense.
Reclassifications and Revisions	'
	Reclassifications and Revisions
	Prior period amounts have been reclassified where necessary to conform to the current period presentation.
	Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013, incorrectly reduced net cash flows from financing activities and increased net cash flows from operating activities by an amount equal to the $108 million of net cash proceeds from the termination of the 1999 LILO transaction (see Note I). A revision was made on Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013. The company does not deem this revision material to its consolidated financial statements for the six months ended June 30, 2013.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Earnings Per Common Share	'
	For the three and six months ended June 30, 2014 and 2013, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:
			For the Three Months						For the Six Months
			Ended June 30,						Ended June 30,
	(Millions of Dollars, except per share amounts/Shares in Millions)		2014			2013			2014			2013
	Net income for common stock		$	212		$	172		$	574		$	364
	Weighted average common shares outstanding – basic			292.9			292.9			292.9			292.9
	Add: Incremental shares attributable to effect of potentially dilutive securities			1.1			1.4			1.1			1.4
	Adjusted weighted average common shares outstanding – diluted			294			294.3			294			294.3
	Net Income for common stock per common share – basic		$	0.73		$	0.59		$	1.96		$	1.24
	Net Income for common stock per common share – diluted		$	0.72		$	0.59		$	1.95		$	1.24
Changes in Accumulated Other Comprehensive Income by Component	'
	For the three and six months ended June 30, 2014 and 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:
			For the Three Months Ended June 30,
			Con Edison						CECONY
	(Millions of Dollars)		2014			2013			2014			2013
	Beginning balance, accumulated OCI, net of taxes		$	(21	)	$	(50	)	$	(5	)	$	(9	)
	OCI before reclassifications, net of tax of $- and $- for both Con Edison and CECONY			—			—			—			—
	Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, net of tax of $1 and $1 for Con Edison and $- and $- for CECONY, respectively (a)(b)			1			2			—			—
	Current period total OCI, net of taxes		$	1		$	2		$	—		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
			For the Six Months Ended June 30,
			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 and other postretirement benefit plan liabilities, net of tax of $2 and $2 for Con Edison and $- and $- for CECONY, respectively (a)(b)			3			4			1			—
	Current period total OCI, net of taxes		$	5		$	5		$	1		$	—
	Ending balance, accumulated OCI, net of taxes (b)		$	(20	)	$	(48	)	$	(5	)	$	(9	)
	(a)	For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of net periodic pension and other postretirement benefit cost. See Notes E and F.
	(b)	Tax reclassified from accumulated OCI is reported in income tax expense.

Regulatory_Matters_Tables

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2014
Text Block [Abstract]	'
Regulatory Assets and Liabilities	'
	Regulatory Assets and Liabilities
	Regulatory assets and liabilities at June 30, 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		$2,438		$2,730		$2,331		$2,610
	Future income tax		2,158		2,145		2,049		2,030
	Environmental remediation costs		911		938		806		830
	Deferred storm costs		382		441		280		334
	Revenue taxes		214		207		203		196
	Pension and other postretirement benefits deferrals		135		237		109		211
	Surcharge for New York State assessment		110		78		103		74
	Net electric deferrals		73		83		73		83
	Unamortized loss on reacquired debt		61		65		58		62
	O&R transition bond charges		30		33		—		—
	Preferred stock redemption		28		28		28		28
	Property tax reconciliation		28		22		—		—
	Workers’ compensation		12		12		12		12
	Deferred derivative losses – noncurrent		8		8		8		7
	Other		194		174		175		162
	Regulatory assets – noncurrent		6,782		7,201		6,235		6,639
	Recoverable energy costs – current		16		4		14		4
	Deferred derivative losses – current		8		25		7		22
	Regulatory assets – current		24		29		21		26
	Total Regulatory Assets		$6,806		$7,230		$6,256		$6,665
	Regulatory liabilities
	Allowance for cost of removal less salvage		$   569		$   540		$   475		$   453
	Property tax reconciliation		282		322		282		322
	Net unbilled revenue deferrals		115		133		115		133
	Property tax refunds		108		130		108		130
	Long-term interest rate reconciliation		92		105		92		105
	Carrying charges on repair allowance and bonus depreciation		87		98		72		87
	2014 rate plan base rate revenue deferral		82		—		82		—
	New York State income tax rate change		69		—		65		—
	World Trade Center settlement proceeds		52		62		52		62
	Other postretirement benefits deferrals		49		50		43		50
	Unrecognized other postretirement benefits costs		41		—		32		—
	Prudence proceeding		37		40		37		40
	Carrying charges on T&D net plant – electric and steam		24		28		21		20
	Electric excess earnings		21		22		20		18
	Other		233		198		206		178
	Regulatory liabilities – noncurrent		1,861		1,728		1,702		1,598
	Refundable energy costs – current		147		100		110		66
	Deferred derivative gains – current		45		14		36		11
	Revenue decoupling mechanism		18		34		18		30
	Future income tax		17		—		16		—
	Regulatory liabilities – current		227		148		180		107
	Total Regulatory Liabilities		$2,088		$1,876		$1,882		$1,705

Capitalization_Tables

Capitalization (Tables)	6 Months Ended
	Jun. 30, 2014
Text Block [Abstract]	'
Carrying Amounts and Fair Values of Long-Term Debt	'
	The carrying amounts and fair values of long-term debt are:
	(Millions of Dollars)	June 30, 2014				December 31, 2013
	Long-Term Debt (including current portion)	Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Con Edison	$	11,129	$	12,707	$	10,974	$	12,082
	CECONY	$	10,216	$	11,605	$	9,841	$	10,797

Pension_Benefits_Tables

Pension Benefits (Tables) (Pension Plan [Member])	6 Months Ended
	Jun. 30, 2014
Pension Plan [Member]	'
Companies' Net Periodic Benefit Costs	'
	The components of the Companies’ net periodic benefit costs for the three and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		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	)		(198	)		(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		$	136		$	208
	Amortization of regulatory asset		1			1			1			1
	TOTAL PERIODIC BENEFIT COST	$	148		$	224		$	137		$	209
	Cost capitalized		(57	)		(88	)		(54	)		(84	)
	Reconciliation to rate level		30			(30	)		28			(29	)
	Cost charged to operating expenses	$	121		$	106		$	111		$	96
		For the Six Months Ended June 30,
		Con Edison						CECONY
	(Millions of Dollars)	2014			2013			2014			2013
	Service cost – including administrative expenses	$	113		$	133		$	106		$	124
	Interest cost on projected benefit obligation		286			268			268			252
	Expected return on plan assets		(416	)		(375	)		(395	)		(356	)
	Recognition of net actuarial loss		309			416			293			394
	Recognition of prior service costs		2			3			1			2
	NET PERIODIC BENEFIT COST	$	294		$	445		$	273		$	416
	Amortization of regulatory asset		1			1			1			1
	TOTAL PERIODIC BENEFIT COST	$	295		$	446		$	274		$	417
	Cost capitalized		(109	)		(170	)		(103	)		(163	)
	Reconciliation to rate level		57			(24	)		51			(23	)
	Cost charged to operating expenses	$	243		$	252		$	222		$	231

Other_Postretirement_Benefits_

Other Postretirement Benefits (Tables) (Other Postretirement Benefits [Member])	6 Months Ended
	Jun. 30, 2014
Other Postretirement Benefits [Member]	'
Net Periodic Postretirement Benefit Costs	'
	The components of the Companies’ net periodic postretirement benefit costs for the three and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		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			13			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		$	9		$	9		$	8
	Cost capitalized		(4	)		(4	)		(4	)		(4	)
	Reconciliation to rate level		3			16			1			13
	Cost charged to operating expenses	$	9		$	21		$	6		$	17
		For the Six Months Ended June 30,
		Con Edison						CECONY
	(Millions of Dollars)	2014			2013			2014			2013
	Service cost	$	10		$	12		$	7		$	9
	Interest cost on accumulated other postretirement benefit obligation		30			27			26			23
	Expected return on plan assets		(38	)		(39	)		(34	)		(34	)
	Recognition of net actuarial loss		28			32			26			28
	Recognition of prior service cost		(10	)		(13	)		(7	)		(11	)
	NET PERIODIC POSTRETIREMENT BENEFIT COST	$	20		$	19		$	18		$	15
	Cost capitalized		(8	)		(7	)		(7	)		(6	)
	Reconciliation to rate level		6			29			1			25
	Cost charged to operating expenses	$	18		$	41		$	12		$	34

Environmental_Matters_Tables

Environmental Matters (Tables)	6 Months Ended
	Jun. 30, 2014
Environmental Remediation Obligations [Abstract]	'
Accrued Liabilities and Regulatory Assets	'
	The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2014 and December 31, 2013 were as follows:
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Accrued Liabilities:
	Manufactured gas plant sites		$658		$665		$558		$562
	Other Superfund Sites		80		84		79		82
	Total		$738		$749		$637		$644
	Regulatory assets		$911		$938		$806		$830
Environmental Remediation Costs	'
	Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three and six months ended June 30, 2014 and 2013 were as follows:
		For the Three Months Ended June 30,
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Remediation costs incurred		$5		$14		$2		$13
	Insurance recoveries received		—		—		—		—
		For the Six Months Ended June 30,
		Con Edison				CECONY
	(Millions of Dollars)	2014		2013		2014		2013
	Remediation costs incurred		$14		$24		$10		$20
	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 June 30, 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	$	88	$	87	$	82	$	82
	Regulatory assets – workers’ compensation	$	12	$	12	$	12	$	12

Other_Material_Contingencies_T

Other Material Contingencies (Tables)	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Total Guarantees	'
	A summary, by type and term, of Con Edison’s total guarantees at June 30, 2014 is as follows:
	Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
		(Millions of Dollars)
	Energy transactions	$	744	$	25	$	68	$	837
	Solar energy projects		560		—		—		560
	Other		31		—		—		31
	Total	$	1,335	$	25	$	68	$	1,428

Lease_InLease_Out_Transactions1

Lease In/Lease Out Transactions (Tables)	6 Months Ended
	Jun. 30, 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 and six months ended as of June 30, 2014 and 2013 was as follows:
		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
	(Millions of Dollars)	2014		2013		2014		2013
	Increase/(decrease) to non-utility operating revenues	$	—	$	51	$	—	$	-70
	(Increase)/decrease to other interest expense		—		—		13		-131
	Income tax benefit/(expense)		—		-22		-6		80
	Total increase/(decrease) in net income	$	—	$	29	$	7	$	-121

Financial_Information_by_Busin1

Financial Information by Business Segment (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Financial Data for Business Segments	'
	The financial data for the business segments are as follows:
			For the Three Months Ended June 30,
			Operating						Inter-segment						Depreciation and					Operating
			revenues						revenues						amortization					income
	(Millions of Dollars)		2014			2013			2014			2013			2014			2013		2014			2013
	CECONY
	Electric		$	1,978		$	1,872		$	4		$	4		$	195		$	186	$	347		$	307
	Gas			360			331			2			2			33			32		54			53
	Steam			98			118			21			19			19			17		(15	)		(14	)
	Consolidation adjustments			—			—			(27	)		(25	)		—			—		—			—
	Total CECONY		$	2,436		$	2,321		$	—		$	—		$	247		$	235	$	386		$	346
	O&R
	Electric		$	157		$	146		$	—		$	—		$	11		$	10	$	25		$	14
	Gas			35			35			—			—			4			4		(5	)		(1	)
	Total O&R		$	192		$	181		$	—		$	—		$	15		$	14	$	20		$	13
	Competitive energy businesses		$	284		$	317		$	(1	)	$	2		$	4		$	5	$	48		$	27
	Other*			(1	)		(1	)		1			(2	)		(1	)		1		1			—
	Total Con Edison		$	2,911		$	2,818		$	—		$	—		$	265		$	255	$	455		$	386
	*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.
			For the Six Months Ended June 30,
			Operating						Inter-segment						Depreciation and					Operating
			revenues						revenues						amortization					income
	(Millions of Dollars)		2014			2013			2014			2013			2014			2013		2014			2013
	CECONY
	Electric		$	4,053		$	3,686		$	8		$	8		$	383		$	371	$	605		$	495
	Gas			1,149			991			3			3			64			64		287			296
	Steam			439			450			41			38			39			33		138			115
	Consolidation adjustments			—			—			(52	)		(49	)		—			—		—			—
	Total CECONY		$	5,641		$	5,127		$	—		$	—		$	486		$	468	$	1,030		$	906
	O&R
	Electric		$	320		$	291		$	—		$	—		$	21		$	20	$	37		$	34
	Gas			128			117			—			—			8			8		22			27
	Total O&R		$	448		$	408		$	—		$	—		$	29		$	28	$	59		$	61
	Competitive energy businesses		$	612		$	469		$	1		$	4		$	11		$	10	$	50		$	(56	)
	Other*			(1	)		(1	)		(1	)		(4	)		—			—		1			1
	Total Con Edison		$	6,700		$	6,003		$	—		$	—		$	526		$	506	$	1,140		$	912
	*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2014 were:
	(Millions of Dollars)
	Commodity Derivatives		Gross				Gross Amounts				Net Amounts of			Gross Amounts Not				Net
			Amounts of				Offset in the				Assets/(Liabilities)			Offset in the Statement				Amount
			Recognized				Statement of				Presented in			of Financial Position
			Assets/(Liabilities)				Financial Position				the Statement
											of Financial
											Position
														Financial		Cash
														instruments		collateral
																received
	Con Edison
	Derivative assets		$	242			$	(127	)		$	115	(a)	$	—	$	—	$	115	(a)
	Derivative liabilities			(110	)			100				(10	)		—		—		(10	)
	Net derivative assets/(liabilities)		$	132			$	(27	)		$	105	(a)	$	—	$	—	$	105	(a)
	CECONY
	Derivative assets		$	95			$	(45	)		$	50	(a)	$	—	$	—	$	50	(a)
	Derivative liabilities			(49	)			43				-6			—		—		-6
	Net derivative assets/(liabilities)		$	46			$	(2	)		$	44	(a)	$	—	$	—	$	44	(a)
	(a)	At June 30, 2014, Con Edison and CECONY had margin deposits of $2 million and $1 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				Gross Amounts				Net Amounts of			Gross Amounts Not				Net
			Amounts of				Offset in the				Assets/(Liabilities)			Offset in the Statement				Amount
			Recognized				Statement of				Presented in			of Financial Position
			Assets/(Liabilities)				Financial Position				the Statement
											of Financial
											Position
														Financial		Cash
														instruments		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.
Fair Values of Companies' Commodity Derivatives	'
	The fair values of the Companies’ commodity derivatives at June 30, 2014 were:
	(Millions of Dollars)		Fair Value of Commodity Derivatives(a)		Con Edison				CECONY
			Balance Sheet Location
	Derivative Assets
	Current		Other current assets		$	190			$	69
	Noncurrent		Other deferred charges and noncurrent assets			52				26
	Total derivative assets				$	242			$	95
	Impact of netting					(125	)			(44	)
	Net derivative assets				$	117			$	51
	Derivative Liabilities
	Current		Fair value of derivative liabilities		$	72			$	25
	Noncurrent		Fair value of derivative liabilities			38				24
	Total derivative liabilities				$	110			$	49
	Impact of netting					(100	)			(43	)
	Net derivative liabilities				$	10			$	6
	(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)		Con Edison				CECONY
			Balance Sheet Location
	Derivative Assets
	Current		Other current assets		$	134			$	27
	Noncurrent		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
	Noncurrent		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 and six months ended June 30, 2014:
	Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
	Deferred or Recognized in Income for the Three Months Ended June 30, 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		$	1			$	1
	Noncurrent		Deferred derivative gains			2				2
	Total deferred gains/(losses)				$	3			$	3
	Current		Deferred derivative losses		$	(2	)		$	(2	)
	Current		Recoverable energy costs			(7	)			(6	)
	Noncurrent		Deferred derivative losses			(3	)			(3	)
	Total deferred gains/(losses)				$	(12	)		$	(11	)
	Net deferred gains/(losses)				$	(9	)		$	(8	)
			Income Statement Location
	Pre-tax gain/(loss) recognized in income
			Purchased power expense		$	(13	)(b)		$	—
			Gas purchased for resale			(32	)			—
			Non-utility revenue			14	(b)			—
	Total pre-tax gain/(loss) recognized in income				$	(31	)		$	—
	(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 June 30, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax loss of $(5) million.
	Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
	Deferred or Recognized in Income for the Six Months Ended June 30, 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		$	31			$	25
	Noncurrent		Deferred derivative gains			7				6
	Total deferred gains/(losses)				$	38			$	31
	Current		Deferred derivative losses		$	15			$	15
	Current		Recoverable energy costs			87				70
	Noncurrent		Deferred derivative losses			—				(1	)
	Total deferred gains/(losses)				$	102			$	84
	Net deferred gains/(losses)				$	140			$	115
			Income Statement Location
	Pre-tax gain/(loss) recognized in income
			Purchased power expense		$	161	(b)		$	—
			Gas purchased for resale			(46	)			—
			Non-utility revenue			(10	)(b)			—
	Total pre-tax gain/(loss) recognized in income				$	105			$	—
	(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 six months ended June 30, 2014, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $15 million.
	The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2013:
	Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
	Deferred or Recognized in Income for the Three Months Ended June 30, 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		$	(7	)		$	(7	)
	Noncurrent		Regulatory liabilities			(2	)			(1	)
	Total deferred gains/(losses)				$	(9	)		$	(8	)
	Current		Deferred derivative losses		$	(24	)		$	(23	)
	Current		Recoverable energy costs			(14	)			(12	)
	Noncurrent		Deferred derivative losses			(10	)			(6	)
	Total deferred gains/(losses)				$	-48			$	-41
	Net deferred gains/(losses)				$	-57			$	-49
			Income Statement Location
	Pre-tax gain/(loss) recognized in income
			Purchased power expense		$	(37	)(b)		$	—
			Gas purchased for resale			(7	)			—
			Non-utility revenue			2	(b)			—
	Total pre-tax gain/(loss) recognized in income				$	(42	)		$	—
	(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 June 30, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax loss of $(1) million and $(29) million, respectively.
	Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a)
Deferred or Recognized in Income for the Six Months Ended June 30, 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		$	2			$	1
Noncurrent		Regulatory liabilities			—				—
Total deferred gains/(losses)				$	2			$	1
Current		Deferred derivative losses		$	14			$	9
Current		Recoverable energy costs			(3	)			(2	)
Noncurrent		Deferred derivative losses			(3	)			—
Total deferred gains/(losses)				$	8			$	7
Net deferred gains/(losses)				$	10			$	8
		Income Statement Location
Pre-tax gain/(loss) recognized in income
		Purchased power expense		$	30	(b)		$	—
		Gas purchased for resale			(11	)			—
		Non-utility revenue			1	(b)			—
Total pre-tax gain/(loss) recognized in income				$	20			$	—
(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 six months ended June 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $16 million.
Number of Derivative Contracts by Commodity Type	'
	The following table presents the number of contracts by commodity type:
			Electric Derivatives															Gas Derivatives
			Number of				MWHs (b)				Number of			MWs (b)		Number of		Dths (b)			Total
			Energy								Capacity					Contracts (a)					Number Of
			Contracts (a)								Contracts (a)										Contracts (a)
	Con Edison			557				14,772,012				65			5,430		663		73,289,826			1,285
	CECONY			88				3,500,475				4			600		484		64,760,000			576
	(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	'
	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 June 30, 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)		$	—			$	—
	Additional collateral(b) (downgrade to below investment grade from current ratings)		$	9	(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 June 30, 2014, would have amounted to an estimated $17 million for Con Edison, including $5 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 June 30, 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 $45 million, including $1 million for CECONY.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2014 are summarized below.
			Level 1					Level 2					Level 3				Netting						Total
																	Adjustments (d)
	(Millions of Dollars)		Con		CECONY			Con			CECONY		Con		CECONY		Con			CECONY			Con		CECONY
			Edison					Edison					Edison				Edison						Edison
	Derivative assets:
	Commodity (a)(e)(f)		$	7	$	5		$	166		$	43	$	28	$	14	$	(84	)	$	(11	)	$	117	$	51
	Other assets (c)(e)(f)			160		153			116			105		—		—		—			—			276		258
	Total		$	167	$	158		$	282		$	148	$	28	$	14	$	(84	)	$	(11	)	$	393	$	309
	Derivative liabilities:
	Commodity (a)(e)(f)		$	5	$	3		$	63		$	13	$	1	$	—	$	-59		$	-10		$	10	$	6
	Interest rate contract (b)(e)(f)			—		—			1			—		—		—		—			—			1		—
	Total		$	5	$	3		$	64		$	13	$	1	$	—	$	-59		$	-10		$	11	$	6
	(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 six months ended June 30, 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						Total
																	Adjustments (d)
	(Millions of Dollars)		Con		CECONY			Con			CECONY		Con		CECONY		Con			CECONY			Con		CECONY
			Edison					Edison					Edison				Edison						Edison
	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)	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.
Schedule of Commodity Derivatives	'
	The managers of the risk management groups report to the Companies’ Vice President and Treasurer.
			Fair Value of Level		Valuation		Unobservable Inputs	Range
			3 at		Techniques
			June 30, 2014
			(Millions of Dollars)
	Con Edison—Commodity
	Electricity			$10	Discounted Cash Flow		Forward energy prices (a)	$28.93-$150.25 per MWH
					Discounted Cash Flow		Forward capacity prices (a)	$5.25-$18.69 per kW-month
	Transmission Congestion Contracts / Financial Transmission Rights			17	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)	6.1%-49.1%
							Inter-zonal forward price curves adjusted for historical zonal losses (b)	$0.32-$11.24 per MWh
	Total Con Edison—Commodity			$27
	CECONY—Commodity
	Transmission Congestion Contracts			$14	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)	6.1%-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	'
	The table listed below provides a reconciliation of the beginning and ending net balances for assets and liabilities measured at fair value as of June 30, 2014 and 2013 and classified as Level 3 in the fair value hierarchy:
			For the Three Months Ended June 30, 2014
					Total Gains/(Losses)—
					Realized and Unrealized
	(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
			Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
			1-Apr-14					and Liabilities												Level 3			June 30, 2014
	Con Edison
	Derivatives:
	Commodity			$24		($2)			$3			$3		$—		$—		($1)			$—			$27
	CECONY
	Derivatives:
	Commodity			$13		($2)			$3			$2		$—		$—		($2)			$—			$14
			For the Six Months Ended June 30, 2014
					Total Gains/(Losses)—
					Realized and Unrealized
	(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
			Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
			January 1, 2014					and Liabilities												Level 3			June 30, 2014
	Con Edison
	Derivatives:
	Commodity			$9		$49			$7			$11		$—		$—		($49)			$—			$27
	CECONY
	Derivatives:
	Commodity			$6		$9			$7			$9		$—		$—		($17)			$—			$14
			For Three Months Ended June 30, 2013
					Total Gains/(Losses)—
					Realized and Unrealized
	(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
			Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
			1-Apr-13					and Liabilities												Level 3			June 30, 2013
	Con Edison
	Derivatives:
	Commodity		$	14	$	(21	)	$	(2	)	$	2	$	—	$	—	$	1		$	—		$	-6
	CECONY
	Derivatives:
	Commodity		$	11	$	(2	)	$	—		$	1	$	—	$	—	$	-2		$	—		$	8
			For Six Months Ended June 30, 2013
					Total Gains/(Losses)—
					Realized and Unrealized
	(Millions of Dollars)		Beginning		Included in			Included in			Purchases		Issuances		Sales		Settlements			Transfer			Ending
			Balance as of		Earnings			Regulatory Assets												In/Out of			Balance as of
			January 1, 2013					and Liabilities												Level 3			June 30, 2013
	Con Edison
	Derivatives:
	Commodity		$	-5	$	8		$	3		$	7	$	—	$	—	$	-19		$	—		$	-6
	CECONY
	Derivatives:
	Commodity		$	10	$	7		$	1		$	5	$	—	$	—	$	-15		$	—		$	8

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2014
Equity Method Investments And Joint Ventures [Abstract]	'
Schedule of Sale and Deconsolidation of a Variable Interest Entity	'
	As a result of the sale, Con Edison Development received net proceeds of $108 and recognized a pre-tax gain on the sale of $45 million ($26 million, net of tax). The following table summarizes the sale and resultant deconsolidation on the transaction date:
	(Millions of Dollars)
	Proceeds from sale, net of transaction costs of $1	$	108
	Non-utility property, less accumulated depreciation		(341	)
	Other assets, including working capital		(31	)
	Long-term debt, including current portion		217
	Other liabilities		9
	Gain on sale of solar energy projects		(45	)
	Equity method investment upon deconsolidation	$	(83	)

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Earnings per Common Share (Detail) (USD $)	3 Months Ended				6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'	'	'
Net income for common stock	$212	$361	$172	$192	$574	$364
Weighted average common shares outstanding - basic	292.9	'	292.9	'	292.9	292.9
Add: Incremental shares attributable to effect of potentially dilutive securities	1.1	'	1.4	'	1.1	1.4
Adjusted weighted average common shares outstanding - diluted	294	'	294.3	'	294	294.3
Net income for common stock per common share - basic	$0.73	'	$0.59	'	$1.96	$1.24
Net income for common stock per common share - diluted	$0.72	'	$0.59	'	$1.95	$1.24

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance, accumulated OCI, net of taxes	($21)	($50)	($25)	($53)
OCI before reclassifications, net of tax	0	0	2	1
Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, net of tax	1	2	3	4
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	1	2	5	5
Ending balance, accumulated OCI, net of taxes	-20	-48	-20	-48
CECONY [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance, accumulated OCI, net of taxes	-5	-9	-6	-9
OCI before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, net of tax	0	0	1	0
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES	0	0	1	0
Ending balance, accumulated OCI, net of taxes	($5)	($9)	($5)	($9)

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Parenthetical) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
OCI before reclassifications, Tax	$0	$0	$1	$1
Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, Tax	1	1	2	2
CECONY [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
OCI before reclassifications, Tax	0	0	0	0
Amounts reclassified from accumulated OCI related to pension and other postretirement benefit plan liabilities, Tax	$0	$0	$0	$0

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013
Accounting Policies [Abstract]	'
Reduction in net cash flow from financing activities instead of operating activities	$108

Regulatory_Matters_Other_Regul

Regulatory Matters - Other Regulatory Matters - Additional Information (Detail) (USD $)	6 Months Ended		6 Months Ended		6 Months Ended		1 Months Ended			6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014	Jul. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	Jun. 30, 2014	Jul. 31, 2014
			CECONY [Member]	CECONY [Member]	Orange and Rockland Utilities, Inc. [Member]	Rockland Electric Company [Member]	Rockland Electric Company [Member]	Rockland Electric Company [Member]	Pike County Light & Power Company [Member]	Storm Damage [Member]	Deferred Storm Costs [Member]
							Subsequent Event [Member]	Effective August 1, 2014 [Member]	Effective September 1, 2014 [Member]	Customer	Rockland Electric Company [Member]
								Subsequent Event [Member]			Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Electric rate increases	'	'	'	'	'	'	'	$13	$1.25	'	'
Return on common equity	'	'	'	'	'	'	9.75%	'	'	'	'
Common equity ratio	'	'	'	'	'	'	50.00%	'	'	'	'
Regulatory asset	6,806	7,230	6,256	6,665	'	'	'	'	'	'	25.6
Regulatory asset recovery period	'	'	'	'	'	'4 years	'	'	'	'	'
Gas rate increases	'	'	'	'	'	'	'	'	0.1	'	'
Revenues from electric	249	'	'	'	'	'	'	'	'	'	'
Revenues from gas	32	'	'	'	'	'	'	'	'	'	'
Revenues from steam service	6	'	'	'	'	'	'	'	'	'	'
Potential refund to customers	1,531	'	'	'	'	'	'	'	'	'	'
Overcharges of construction expenditures	208	'	'	'	'	'	'	'	'	'	'
Regulatory liability	37	'	'	'	'	'	'	'	'	'	'
Company recovered from related parties	16	'	'	'	'	'	'	'	'	'	'
Amount recovered for the benefit of customers	15	'	'	'	'	'	'	'	'	'	'
Additional refundable amounts applicable to customers	25	'	'	'	'	'	'	'	'	'	'
Number of customers interrupted electric distribution service	'	'	'	'	'	'	'	'	'	1,400,000	'
Response and restoration costs	'	'	495	'	92	'	'	'	'	'	'
Capital expenditures	'	'	$147	'	$15	'	'	'	'	'	'

Regulatory_Matters_Regulatory_

Regulatory Matters - Regulatory Assets and Liabilities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Regulatory assets	'	'
Regulatory assets - long-term	$6,782	$7,201
Regulatory assets - current	24	29
Total Regulatory Assets	6,806	7,230
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	1,861	1,728
Regulatory liabilities - current	227	148
Total Regulatory Liabilities	2,088	1,876
Allowance for Cost of Removal Less Salvage [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	569	540
Net Unbilled Revenue Deferrals [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	115	133
Property Tax Refunds [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	108	130
Long-Term Interest Rate Reconciliation [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	92	105
Carrying Charges on Repair Allowance and Bonus Depreciation [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	87	98
2014 Rate Plan Base Rate Revenue Deferral [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	82	'
New York State Income Tax Rate Change [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	69	'
World Trade Center Settlement Proceeds [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	52	62
Other Postretirement Benefits Deferrals [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	49	50
Unrecognized Other Postretirement Benefits Costs [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	41	'
Prudence Proceeding [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	37	40
Carrying Charges on Transmission and Distribution Net Plant [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	24	28
Electric Excess Earnings [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	21	22
Other [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	233	198
Refundable Energy Costs - Current [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - current	147	100
Deferred Derivative Gains - Current [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - current	45	14
Revenue Decoupling Mechanism [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - current	18	34
Future Income Tax [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - current	17	'
Unrecognized Pension and Other Postretirement Costs [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	2,438	2,730
Future Income Tax [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	2,158	2,145
Environmental Remediation Costs [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	911	938
Deferred Storm Costs [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	382	441
Revenue Taxes [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	214	207
Pension and Other Postretirement Benefits Deferrals [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	135	237
Surcharge for New York State Assessment [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	110	78
Net Electric Deferrals [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	73	83
Unamortized Loss on Reacquired Debt [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	61	65
O&R Transition Bond Charges [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	30	33
Preferred Stock Redemption [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	28	28
Property Tax Reconciliation [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	28	22
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	282	322
Workers' Compensation [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	12	12
Deferred Derivative Losses - Noncurrent [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	8	8
Other [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	194	174
Recoverable Energy Costs - Current [Member]	'	'
Regulatory assets	'	'
Regulatory assets - current	16	4
Deferred Derivative Losses - Current [Member]	'	'
Regulatory assets	'	'
Regulatory assets - current	8	25
CECONY [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	6,235	6,639
Regulatory assets - current	21	26
Total Regulatory Assets	6,256	6,665
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	1,702	1,598
Regulatory liabilities - current	180	107
Total Regulatory Liabilities	1,882	1,705
CECONY [Member] | Allowance for Cost of Removal Less Salvage [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	475	453
CECONY [Member] | Net Unbilled Revenue Deferrals [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	115	133
CECONY [Member] | Property Tax Refunds [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	108	130
CECONY [Member] | Long-Term Interest Rate Reconciliation [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	92	105
CECONY [Member] | Carrying Charges on Repair Allowance and Bonus Depreciation [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	72	87
CECONY [Member] | 2014 Rate Plan Base Rate Revenue Deferral [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	82	'
CECONY [Member] | New York State Income Tax Rate Change [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	65	'
CECONY [Member] | World Trade Center Settlement Proceeds [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	52	62
CECONY [Member] | Other Postretirement Benefits Deferrals [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	43	50
CECONY [Member] | Unrecognized Other Postretirement Benefits Costs [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	32	'
CECONY [Member] | Prudence Proceeding [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	37	40
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	20	18
CECONY [Member] | Other [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - noncurrent	206	178
CECONY [Member] | Refundable Energy Costs - Current [Member]	'	'
Regulatory liabilities	'	'
Regulatory liabilities - current	110	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	18	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	2,331	2,610
CECONY [Member] | Future Income Tax [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	2,049	2,030
CECONY [Member] | Environmental Remediation Costs [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	806	830
CECONY [Member] | Deferred Storm Costs [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	280	334
CECONY [Member] | Revenue Taxes [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	203	196
CECONY [Member] | Pension and Other Postretirement Benefits Deferrals [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	109	211
CECONY [Member] | Surcharge for New York State Assessment [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	103	74
CECONY [Member] | Net Electric Deferrals [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	73	83
CECONY [Member] | Unamortized Loss on Reacquired Debt [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	58	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	282	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	8	7
CECONY [Member] | Other [Member]	'	'
Regulatory assets	'	'
Regulatory assets - long-term	175	162
CECONY [Member] | Recoverable Energy Costs - Current [Member]	'	'
Regulatory assets	'	'
Regulatory assets - current	14	4
CECONY [Member] | Deferred Derivative Losses - Current [Member]	'	'
Regulatory assets	'	'
Regulatory assets - current	$7	$22

Capitalization_Additional_Info

Capitalization - Additional Information (Detail) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Feb. 28, 2014

Mar. 31, 2014

Apr. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

31-May-14

In Millions, unless otherwise specified

Level 2 [Member]

Level 3 [Member]

CECONY [Member]

CECONY [Member]

CECONY [Member]

CECONY [Member]

CECONY [Member]

CECONY [Member]

CECONY [Member]

CCH [Member]

4.70 Percent Debentures [Member]

4.45 Percent Debentures [Member]

5.55 Percent Debentures [Member]

Level 2 [Member]

Level 3 [Member]

Schedule of Capitalization [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Debentures redeemed at maturity

'

'

'

'

'

'

$200

'

$275

'

'

'

Debentures interest rate

'

'

'

'

'

'

4.70%

4.45%

5.55%

'

'

'

Period of debentures

'

'

'

'

'

'

'10 years

'30 years

'5 years

'

'

'

Debentures issued

'

'

'

'

'

'

'

850

'

'

'

'

Deconsolidated long term debt

11,129

10,974

'

'

10,216

9,841

'

'

'

'

'

217

Percentage of variable interests sold

'

'

'

'

'

'

'

'

'

'

'

50.00%

Long-term debt, fair value

12,707

12,082

12,071

636

11,605

10,797

'

'

'

10,969

636

'

Tax-exempt debt

'

'

'

'

'

'

'

'

'

'

$636

'

Capitalization_Carrying_Amount

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Carrying Amount	$11,129	$10,974
Fair Value	12,707	12,082
CECONY [Member]	'	'
Debt Instrument [Line Items]	'	'
Carrying Amount	10,216	9,841
Fair Value	$11,605	$10,797

ShortTerm_Borrowing_Additional

Short-Term Borrowing - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]	'	'
Commercial paper, outstanding	$1,531	$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	49	26
CECONY [Member]	'	'
Short-term Debt [Line Items]	'	'
Commercial paper, outstanding	1,482	1,210
Weighted average interest rate	0.20%	0.20%
Letters of credit outstanding under the credit agreement	$11	$11

Pension_Benefits_Companies_Net

Pension Benefits - Companies' Net Periodic Benefit Costs (Detail) (Pension Plan [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost - including administrative expenses	$57	$67	$113	$133
Interest cost on projected benefit obligation	143	134	286	268
Expected return on plan assets	-208	-187	-416	-375
Recognition of net actuarial loss	154	208	309	416
Recognition of prior service costs	1	1	2	3
NET PERIODIC BENEFIT COST	147	223	294	445
Amortization of regulatory asset	1	1	1	1
TOTAL PERIODIC BENEFIT COST	148	224	295	446
Cost capitalized	-57	-88	-109	-170
Reconciliation to rate level	30	-30	57	-24
Cost charged to operating expenses	121	106	243	252
CECONY [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost - including administrative expenses	53	62	106	124
Interest cost on projected benefit obligation	134	126	268	252
Expected return on plan assets	-198	-178	-395	-356
Recognition of net actuarial loss	146	197	293	394
Recognition of prior service costs	1	1	1	2
NET PERIODIC BENEFIT COST	136	208	273	416
Amortization of regulatory asset	1	1	1	1
TOTAL PERIODIC BENEFIT COST	137	209	274	417
Cost capitalized	-54	-84	-103	-163
Reconciliation to rate level	28	-29	51	-23
Cost charged to operating expenses	$111	$96	$222	$231

Pension_Benefits_Additional_In

Pension Benefits - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Pension Plan [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Estimated future employer contributions	$564
Pension Plan [Member] | CECONY [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Estimated future employer contributions	524
Contributions	400
Non-qualified Supplemental Plan [Member] | CECONY [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Contributions	$13

Other_Postretirement_Benefits_1

Other Postretirement Benefits - Net Periodic Postretirement Benefit Costs (Detail) (Other Postretirement Benefits [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$5	$6	$10	$12
Interest cost on accumulated other postretirement benefit obligation	15	13	30	27
Expected return on plan assets	-19	-19	-38	-39
Recognition of net actuarial loss	14	16	28	32
Recognition of prior service cost	-5	-7	-10	-13
NET PERIODIC POSTRETIREMENT BENEFIT COST	10	9	20	19
Cost capitalized	-4	-4	-8	-7
Reconciliation to rate level	3	16	6	29
Cost charged to operating expenses	9	21	18	41
CECONY [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	4	5	7	9
Interest cost on accumulated other postretirement benefit obligation	13	12	26	23
Expected return on plan assets	-17	-17	-34	-34
Recognition of net actuarial loss	13	14	26	28
Recognition of prior service cost	-4	-6	-7	-11
NET PERIODIC POSTRETIREMENT BENEFIT COST	9	8	18	15
Cost capitalized	-4	-4	-7	-6
Reconciliation to rate level	1	13	1	25
Cost charged to operating expenses	$6	$17	$12	$34

Other_Postretirement_Benefits_2

Other Postretirement Benefits - Additional Information (Detail) (Other Postretirement Benefits [Member], USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]	'
Expected contributions	$7
CECONY [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Expected contributions	$7

Environmental_Matters_Accrued_

Environmental Matters - Accrued Liabilities and Regulatory Assets (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accrued Liabilities:	'	'
Accrued Liabilities	$738	$749
Regulatory assets	6,806	7,230
Manufactured Gas Plant Sites [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	658	665
Other Superfund Sites [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	80	84
Superfund Sites [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	738	749
Regulatory assets	911	938
CECONY [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	637	644
Regulatory assets	6,256	6,665
CECONY [Member] | Manufactured Gas Plant Sites [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	558	562
CECONY [Member] | Other Superfund Sites [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	79	82
CECONY [Member] | Superfund Sites [Member]	'	'
Accrued Liabilities:	'	'
Accrued Liabilities	637	644
Regulatory assets	$806	$830

Environmental_Matters_Environm

Environmental Matters - Environmental Remediation Costs (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Environmental Exit Cost [Line Items]	'	'	'	'
Remediation costs incurred	$5	$14	$14	$24
Insurance recoveries received	'	'	5	'
CECONY [Member]	'	'	'	'
Environmental Exit Cost [Line Items]	'	'	'	'
Remediation costs incurred	2	13	10	20
Insurance recoveries received	'	'	$5	'

Environmental_Matters_Addition

Environmental Matters - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	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
Orange and Rockland Utilities, Inc. [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_1

Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Site Contingency [Line Items]	'	'
Regulatory assets	$6,806	$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	88	87
Regulatory assets	12	12
CECONY [Member]	'	'
Site Contingency [Line Items]	'	'
Regulatory assets	6,256	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_A

Other Material Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
	Jul. 31, 2007	Jun. 30, 2014	Dec. 31, 2013
	Person	Guarantee
		Entity
		Lawsuits
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	'	$50,000,000	'
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	'	1,428,000,000	1,331,000,000
Number of entities	'	2	'
Number of guaranteed payments	'	2	'
Other [Member]	'	'	'
Operating Leased Assets [Line Items]	'	'	'
Guarantee obligations maximum exposure	'	31,000,000	'
Estimate of maximum potential obligation	'	5,000,000	'
Indemnity agreements amount	'	25,000,000	'
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	'	80,000,000	'
Con Edison Development [Member] | Guarantee Two [Member]	'	'	'
Operating Leased Assets [Line Items]	'	'	'
Guarantee obligations maximum exposure	'	120,000,000	'
Construction and Operation of Solar Energy Facilities [Member]	'	'	'
Operating Leased Assets [Line Items]	'	'	'
Guarantees issued	'	3,000,000	'
Insurance Receivable [Member]	'	'	'
Operating Leased Assets [Line Items]	'	'	'
Estimated accrued liability for suits	'	$50,000,000	'

Other_Material_Contingencies_T1

Other Material Contingencies - Total Guarantees (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	$1,428,000,000	$1,331,000,000
Energy Transactions [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	837,000,000	'
Solar Energy Projects [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	560,000,000	'
Other [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	31,000,000	'
0 - 3 years [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	1,335,000,000	'
0 - 3 years [Member] | Energy Transactions [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	744,000,000	'
0 - 3 years [Member] | Solar Energy Projects [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	560,000,000	'
0 - 3 years [Member] | Other [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	31,000,000	'
4 - 10 years [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	25,000,000	'
4 - 10 years [Member] | Energy Transactions [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	25,000,000	'
Greater than 10 years [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	68,000,000	'
Greater than 10 years [Member] | Energy Transactions [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total guarantees, by type and term	$68,000,000	'

Lease_InLease_Out_Transactions2

Lease In/Lease Out Transactions - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2013	Jan. 31, 2013	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 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	'	'	'
Gain from LILO transaction termination	'	'	'	29	'	'
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

Lease_InLease_Out_Transactions3

Lease In/Lease Out Transactions - Schedule of Effect of LILO Transactions on Consolidated Income Statement (Detail) (USD $)	3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Leased Assets [Line Items]	'	'	'
Increase/(decrease) in net income	$29	$7	($121)
Non-Utility Operating Revenues [Member]	'	'	'
Operating Leased Assets [Line Items]	'	'	'
Increase/(decrease) in net income	51	'	-70
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	($22)	($6)	$80

Income_Tax_Additional_Informat

Income Tax - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended				6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Loss Carryforwards [Line Items]	'	'	'	'	'	'	'
Increase (decrease) in income tax expense	'	$37	'	'	($15)	$178	'
Effective tax rate	'	32.00%	'	27.00%	'	34.00%	25.00%
Corporate franchise tax rate	7.10%	'	'	'	'	'	'
Decrease in accumulated deferred tax liabilities	'	'	'	'	'	80	'
Decrease in regulatory asset	'	'	'	'	'	11	'
Increase in regulatory liability	'	'	'	'	'	69	'
Increase in estimated prior year liabilities	'	'	22	'	'	'	'
Uncertain tax positions	'	31	'	'	'	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	'
Uncertain tax positions expected to resolve in next twelve months	'	13	'	'	'	13	'
Unrecognized tax benefits, if recognized, would reduce effective tax rate	'	31	'	'	'	31	'
Federal Taxes [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'	'	'	'	'
Uncertain tax positions expected to resolve in next twelve months, net of federal taxes	'	8	'	'	'	8	'
Unrecognized tax benefits, if recognized, would reduce effective tax rate, net of federal taxes	'	20	'	'	'	20	'
Beginning January 1, 2016 [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'	'	'	'	'
Corporate franchise tax rate	6.50%	'	'	'	'	'	'
CECONY [Member]	'	'	'	'	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'	'	'	'	'
Increase (decrease) in income tax expense	'	21	'	'	'	53	'
Effective tax rate	'	31.00%	'	27.00%	'	34.00%	33.00%
Decrease in accumulated deferred tax liabilities	'	'	'	'	'	75	'
Decrease in regulatory asset	'	'	'	'	'	10	'
Increase in regulatory liability	'	'	'	'	'	65	'
Uncertain tax positions	'	$0	'	'	'	$0	'

Financial_Information_by_Busin2

Financial Information by Business Segment - Financial Data for Business Segments (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	$2,911	$2,818	$6,700	$6,003
Depreciation and amortization	265	255	526	506
Operating income	455	386	1,140	912
Competitive Energy Businesses [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	284	317	612	469
Inter-segment revenues	-1	2	1	4
Depreciation and amortization	4	5	11	10
Operating income	48	27	50	-56
Other [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	-1	-1	-1	-1
Inter-segment revenues	1	-2	-1	-4
Depreciation and amortization	-1	1	'	'
Operating income	1	'	1	1
CECONY [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	2,436	2,321	5,641	5,127
Depreciation and amortization	247	235	486	468
Operating income	386	346	1,030	906
CECONY [Member] | Operating Segments [Member] | CECONY-Electric [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	1,978	1,872	4,053	3,686
Inter-segment revenues	4	4	8	8
Depreciation and amortization	195	186	383	371
Operating income	347	307	605	495
CECONY [Member] | Operating Segments [Member] | CECONY-Gas [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	360	331	1,149	991
Inter-segment revenues	2	2	3	3
Depreciation and amortization	33	32	64	64
Operating income	54	53	287	296
CECONY [Member] | Operating Segments [Member] | CECONY-Steam [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	98	118	439	450
Inter-segment revenues	21	19	41	38
Depreciation and amortization	19	17	39	33
Operating income	-15	-14	138	115
CECONY [Member] | Consolidation Adjustments [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Inter-segment revenues	-27	-25	-52	-49
Orange and Rockland Utilities, Inc. [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	192	181	448	408
Depreciation and amortization	15	14	29	28
Operating income	20	13	59	61
Orange and Rockland Utilities, Inc. [Member] | Operating Segments [Member] | O&R - Electric [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	157	146	320	291
Depreciation and amortization	11	10	21	20
Operating income	25	14	37	34
Orange and Rockland Utilities, Inc. [Member] | Operating Segments [Member] | O&R - Gas [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating revenues	35	35	128	117
Depreciation and amortization	4	4	8	8
Operating income	($5)	($1)	$22	$27

Derivative_Instruments_and_Hed2

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts of Recognized Assets/(Liabilities)	$132	$53
Gross Amounts Offset in the Statement of Financial Position	-27	-3
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	105	50
Net Amount	105	50
Derivative Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts of Recognized Assets/(Liabilities)	-110	-113
Gross Amounts Offset in the Statement of Financial Position	100	98
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	-10	-15
Net Amount	-10	-15
Derivative Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts of Recognized Assets/(Liabilities)	242	166
Gross Amounts Offset in the Statement of Financial Position	-127	-101
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	115	65
Net Amount	115	65
Financial Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
Financial Instruments [Member] | Derivative Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
Financial Instruments [Member] | Derivative Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
Cash Collateral Received [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
Cash Collateral Received [Member] | Derivative Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
Cash Collateral Received [Member] | Derivative Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
CECONY [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts of Recognized Assets/(Liabilities)	46	-10
Gross Amounts Offset in the Statement of Financial Position	-2	5
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	44	-5
Net Amount	44	-5
CECONY [Member] | Derivative Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts of Recognized Assets/(Liabilities)	-49	-51
Gross Amounts Offset in the Statement of Financial Position	43	37
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	-6	-14
Net Amount	-6	-14
CECONY [Member] | Derivative Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts of Recognized Assets/(Liabilities)	95	41
Gross Amounts Offset in the Statement of Financial Position	-45	-32
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	50	9
Net Amount	50	9
CECONY [Member] | Financial Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
CECONY [Member] | Financial Instruments [Member] | Derivative Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
CECONY [Member] | Financial Instruments [Member] | Derivative Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
CECONY [Member] | Cash Collateral Received [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
CECONY [Member] | Cash Collateral Received [Member] | Derivative Liabilities [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	0	0
CECONY [Member] | Cash Collateral Received [Member] | Derivative Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amounts Not Offset in the Statement of Financial Position	$0	$0

Derivative_Instruments_and_Hed3

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Parenthetical) (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Margin deposits	$2	$17
CECONY [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Margin deposits	$1	$16

Derivative_Instruments_and_Hed4

Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014
		Contract
Investment Holdings [Line Items]	'	'
Energy supply and hedging activities credit exposure total	$141	$141
Makeup of net credit exposure independent system operators	'	47
Makeup of net credit exposure with commodity exchange brokers	49	49
Makeup of net credit exposure with investment-grade counterparties	43	43
Makeup of net credit exposure non-investment grade/non-rated counterparties	'	2
Number of contracts	'	1,285
Terminate date of interest rate swap	'	'October 2014
Increase in the fair value of interest rate swap	1	1
Interest Rate Swap [Member]	'	'
Investment Holdings [Line Items]	'	'
Derivative, fixed interest rate	6.09%	6.09%
Unrealized gain (loss) on derivatives	'	-1
CECONY [Member]	'	'
Investment Holdings [Line Items]	'	'
Energy supply and hedging activities credit exposure total	26	26
Makeup of net credit exposure with commodity exchange brokers	15	15
Makeup of net credit exposure with investment-grade counterparties	$11	$11
Number of contracts	'	576

Derivative_Instruments_and_Hed5

Derivative Instruments and Hedging Activities - Fair Values of Companies' Commodity Derivatives (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative Assets	'	'
Fair value of derivative assets	$242	$166
Impact of netting	-125	-84
Net derivatives assets	117	82
Derivative Liabilities	'	'
Fair value of derivative liabilities	110	113
Impact of netting	-100	-98
Net derivatives liabilities	10	15
Other Current Assets [Member]	'	'
Derivative Assets	'	'
Fair value of derivative assets	190	134
Other Deferred Charges and Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Fair value of derivative assets	52	32
Fair Value of Derivative Liabilities, Current [Member]	'	'
Derivative Liabilities	'	'
Fair value of derivative liabilities	72	82
Fair Value of Derivative Liabilities, Noncurrent [Member]	'	'
Derivative Liabilities	'	'
Fair value of derivative liabilities	38	31
CECONY [Member]	'	'
Derivative Assets	'	'
Fair value of derivative assets	95	41
Impact of netting	-44	-16
Net derivatives assets	51	25
Derivative Liabilities	'	'
Fair value of derivative liabilities	49	51
Impact of netting	-43	-37
Net derivatives liabilities	6	14
CECONY [Member] | Other Current Assets [Member]	'	'
Derivative Assets	'	'
Fair value of derivative assets	69	27
CECONY [Member] | Other Deferred Charges and Noncurrent Assets [Member]	'	'
Derivative Assets	'	'
Fair value of derivative assets	26	14
CECONY [Member] | Fair Value of Derivative Liabilities, Current [Member]	'	'
Derivative Liabilities	'	'
Fair value of derivative liabilities	25	32
CECONY [Member] | Fair Value of Derivative Liabilities, Noncurrent [Member]	'	'
Derivative Liabilities	'	'
Fair value of derivative liabilities	$24	$19

Derivative_Instruments_and_Hed6

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	$3	($9)	$38	$2
Total deferred gains/(losses)	-12	-48	102	8
Net deferred gains/(losses)	-9	-57	140	10
Pre-tax gain/(loss) recognized in income	'	'	'	'
Total pre-tax gain/(loss) recognized in income	-31	-42	105	20
Deferred Derivative Gains - Current [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	1	-7	31	2
Regulatory Liabilities, Noncurrent [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	'	-2	7	'
Deferred Derivative Losses, Current [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	-2	-24	15	14
Recoverable Energy Costs - Current [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	-7	-14	87	-3
Deferred Derivative Losses, Noncurrent [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	-3	-10	'	-3
Deferred Derivative Gains, Noncurrent [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)	3	-8	31	1
Total deferred gains/(losses)	-11	-41	84	7
Net deferred gains/(losses)	-8	-49	115	8
CECONY [Member] | Deferred Derivative Gains - Current [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	1	-7	25	1
CECONY [Member] | Regulatory Liabilities, Noncurrent [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	'	-1	6	'
CECONY [Member] | Deferred Derivative Losses, Current [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	-2	-23	15	9
CECONY [Member] | Recoverable Energy Costs - Current [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	-6	-12	70	-2
CECONY [Member] | Deferred Derivative Losses, Noncurrent [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	-3	-6	-1	'
CECONY [Member] | Deferred Derivative Gains, Noncurrent [Member]	'	'	'	'
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:	'	'	'	'
Total deferred gains/(losses)	2	'	'	'
Purchased Power Costs [Member]	'	'	'	'
Pre-tax gain/(loss) recognized in income	'	'	'	'
Total pre-tax gain/(loss) recognized in income	-13	-37	161	30
Gas Purchased for Resale [Member]	'	'	'	'
Pre-tax gain/(loss) recognized in income	'	'	'	'
Total pre-tax gain/(loss) recognized in income	-32	-7	-46	-11
Non-utility Revenue [Member]	'	'	'	'
Pre-tax gain/(loss) recognized in income	'	'	'	'
Total pre-tax gain/(loss) recognized in income	$14	$2	($10)	$1

Derivative_Instruments_and_Hed7

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Parenthetical) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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	($5)	($29)	$15	$16

Derivative_Instruments_and_Hed8

Derivative Instruments and Hedging Activities - Number of Derivative Contracts by Commodity Type (Detail)	6 Months Ended
	Jun. 30, 2014
	Contract
Derivatives, Fair Value [Line Items]	'
Total Number of Contracts	1,285
CECONY [Member]	'
Derivatives, Fair Value [Line Items]	'
Total Number of Contracts	576
Electric Derivatives [Member]	'
Derivatives, Fair Value [Line Items]	'
Number of Energy Contracts	557
MWHs	14,772,012
Number of Capacity Contracts	65
MWs	5,430
Electric Derivatives [Member] | CECONY [Member]	'
Derivatives, Fair Value [Line Items]	'
Number of Energy Contracts	88
MWHs	3,500,475
Number of Capacity Contracts	4
MWs	600
Gas Derivatives [Member]	'
Derivatives, Fair Value [Line Items]	'
Number of Energy Contracts	663
Dths	73,289,826
Gas Derivatives [Member] | CECONY [Member]	'
Derivatives, Fair Value [Line Items]	'
Number of Energy Contracts	484
Dths	64,760,000

Derivative_Instruments_and_Hed9

Derivative Instruments and Hedging Activities - Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features (Detail) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'
Aggregate fair value - net liabilities	$2
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]	'
Derivatives, Fair Value [Line Items]	'
Collateral posted	45
Additional collateral	9
CECONY [Member]	'
Derivatives, Fair Value [Line Items]	'
Aggregate fair value - net liabilities	1
CECONY [Member] | Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]	'
Derivatives, Fair Value [Line Items]	'
Collateral posted	1
Additional collateral	$2

Recovered_Sheet1

Derivative Instruments and Hedging Activities - Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features (Parenthetical) (Detail) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]	'
Derivatives, Fair Value [Line Items]	'
Collateral posted	$45
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member] | CECONY [Member]	'
Derivatives, Fair Value [Line Items]	'
Collateral posted	1
Additional Collateral Required Due To Loss Of Unsecured Credit [Member]	'
Derivatives, Fair Value [Line Items]	'
Collateral posted	17
Additional Collateral Required Due To Loss Of Unsecured Credit [Member] | CECONY [Member]	'
Derivatives, Fair Value [Line Items]	'
Collateral posted	$5

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	$393	$336
Total liabilities	11	17
CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	309	262
Total liabilities	6	14
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	167	144
Total liabilities	5	5
Level 1 [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	158	137
Total liabilities	3	5
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	282	243
Total liabilities	64	86
Level 2 [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	148	116
Total liabilities	13	27
Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	28	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	14	6
Commodity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	117	82
Derivative liabilities	10	15
Commodity [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	51	25
Derivative liabilities	6	14
Commodity [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	7	3
Derivative liabilities	5	5
Commodity [Member] | Level 1 [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	5	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	166	130
Derivative liabilities	63	84
Commodity [Member] | Level 2 [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	43	13
Derivative liabilities	13	27
Commodity [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	28	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	14	6
Other Assets [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	276	254
Other Assets [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	258	237
Other Assets [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	160	141
Other Assets [Member] | Level 1 [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	153	134
Other Assets [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	116	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
Interest Rate Contract [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative liabilities	1	2
Interest Rate Contract [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative liabilities	1	2
Netting Adjustments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	-84	-62
Total liabilities	-59	-76
Netting Adjustments [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets	-11	3
Total liabilities	-10	-18
Netting Adjustments [Member] | Commodity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	-84	-62
Derivative liabilities	-59	-76
Netting Adjustments [Member] | Commodity [Member] | CECONY [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative assets	-11	3
Derivative liabilities	($10)	($18)

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Commodity Derivatives (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 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	6.10%
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	0.32
Minimum [Member] | Forward Energy Prices [Member]	'
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]	'
Unobservable Inputs Range	28.93
Minimum [Member] | Forward Capacity Prices [Member]	'
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]	'
Unobservable Inputs Range	5.25
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	11.24
Maximum [Member] | Forward Energy Prices [Member]	'
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]	'
Unobservable Inputs Range	150.25
Maximum [Member] | Forward Capacity Prices [Member]	'
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]	'
Unobservable Inputs Range	18.69
Level 3 [Member]	'
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]	'
Fair Value of commodity derivatives	27
Level 3 [Member] | Electricity [Member]	'
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]	'
Fair Value of commodity derivatives	10
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	17
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	6.10%
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	14

Fair_Value_Measurements_Reconc

Fair Value Measurements - Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value (Detail) (Commodity [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning Balance	$24	$14	$9	($5)
Included in Earnings	-2	-21	49	8
Included in Regulatory Assets and Liabilities	3	-2	7	3
Purchases	3	2	11	7
Issuances	'	'	'	'
Sales	'	'	'	'
Settlements	-1	1	-49	-19
Transfer In/Out of Level 3	'	'	'	'
Ending Balance	27	-6	27	-6
CECONY [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning Balance	13	11	6	10
Included in Earnings	-2	-2	9	7
Included in Regulatory Assets and Liabilities	3	'	7	1
Purchases	2	1	9	5
Issuances	'	'	'	'
Sales	'	'	'	'
Settlements	-2	-2	-17	-15
Transfer In/Out of Level 3	'	'	'	'
Ending Balance	$14	$8	$14	$8

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Income [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Fair value, assets measured on recurring basis, change in unrealized gain (loss)	'	($2)	'	($2)
Purchased Power Costs [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Fair value, assets measured on recurring basis, change in unrealized gain (loss)	2	-14	11	2
Competitive Energy Businesses [Member] | Other Income [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Gain (loss) on Level 3 energy derivative liabilities	'	-2	'	-2
Competitive Energy Businesses [Member] | Purchased Power Costs [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Gain (loss) on Level 3 energy derivative liabilities	'	($15)	$40	$4

Variable_Interest_Entities_Add

Variable Interest Entities - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended	1 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	31-May-14	Jun. 30, 2014
			CMS 3 [Member]	CMS 3 [Member]	CMS 3 [Member]	CCH [Member]	CCH [Member]
					Nevada [Member]	MW
					MW
Variable Interest Entity [Line Items]	'	'	'	'	'	'	'
Percentage of variable interests	'	'	50.00%	'	'	'	'
Solar energy project, capacity	'	'	'	'	250	110	'
Investments (including earnings)	'	'	'	$123	'	'	$85
Percentage of variable interests sold	'	'	'	'	'	50.00%	'
Remaining percentage of variable interests	'	'	'	'	'	50.00%	'
Net proceeds on sale	'	108	'	'	'	108	'
Gain on sale, pretax	45	45	'	'	'	45	'
Gain on sale, net of tax	'	'	'	'	'	$26	'

Variable_Interest_Entities_Sch

Variable Interest Entities - Schedule of Sale and Deconsolidation of Transaction (Detail) (USD $)	3 Months Ended	6 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	31-May-14
				CCH [Member]
Variable Interest Entity [Line Items]	'	'	'	'
Proceeds from sale, net of transaction costs of $1	'	$108	'	$108
Non-utility property, less accumulated depreciation	-197	-197	-605	-341
Other assets, including working capital	'	'	'	-31
Long-term debt, including current portion	11,129	11,129	10,974	217
Other liabilities	'	'	'	9
Gain on sale of solar energy projects	-45	-45	'	-45
Equity method investment upon deconsolidation	'	'	'	($83)

Variable_Interest_Entities_Sch1

Variable Interest Entities - Schedule of Sale and Deconsolidation of Transaction (Parenthetical) (Detail) (CCH [Member], USD $)	1 Months Ended
In Millions, unless otherwise specified	31-May-14
CCH [Member]	'
Variable Interest Entity [Line Items]	'
Transaction costs	$1