Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
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