Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Cash and temporary cash investments	$ 117	$ 699
Special deposits	6	8
Accounts receivable - customers, less allowance for uncollectible accounts	1,444	1,201
Other receivables, less allowance for uncollectible accounts	149	133
Income taxes receivable		224
Accrued unbilled revenue	456	500
Fuel oil, gas in storage, materials and supplies, at average cost	332	372
Prepayments	470	163
Regulatory assets	66	148
Deferred tax assets	95	128
Other current assets	263	278
TOTAL CURRENT ASSETS	3,398	3,854
INVESTMENTS	814	816
UTILITY PLANT AT ORIGINAL COST
General	2,479	2,465
TOTAL	36,378	35,909
Less: Accumulated depreciation	7,702	7,614
Net	28,676	28,295
Construction work in progress	947	1,031
NET UTILITY PLANT	29,623	29,326
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	402	388
Construction work in progress	187	113
NET PLANT	30,212	29,827
OTHER NONCURRENT ASSETS
Goodwill	429	429
Intangible assets, less accumulated amortization of $4 in 2015 and 2014	3	3
Regulatory assets	8,906	9,156
Other deferred charges and noncurrent assets	215	223
TOTAL OTHER NONCURRENT ASSETS	9,553	9,811
TOTAL ASSETS	43,977	44,308
CURRENT LIABILITIES
Long-term debt due within one year	496	560
Notes payable	519	800
Accounts payable	937	1,019
Customer deposits	345	344
Accrued taxes	80	72
Accrued interest	180	132
Accrued wages	100	95
Fair value of derivative liabilities	37	64
Regulatory liabilities	240	187
Other current liabilities	473	508
TOTAL CURRENT LIABILITIES	3,407	3,781
NONCURRENT LIABILITIES
Provision for injuries and damages	185	182
Pensions and retiree benefits	3,629	3,914
Superfund and other environmental costs	758	764
Asset retirement obligations	191	188
Fair value of derivative liabilities	24	13
Deferred income taxes and investment tax credits	9,257	9,076
Regulatory liabilities	1,892	1,993
Other deferred credits and noncurrent liabilities	170	181
TOTAL NONCURRENT LIABILITIES	16,106	16,311
LONG-TERM DEBT	11,694	11,631
EQUITY
Common shareholders' equity	12,761	12,576
Noncontrolling interest	9	9
TOTAL EQUITY (See Statement of Equity)	12,770	12,585
TOTAL LIABILITIES AND EQUITY	43,977	44,308
CECONY [Member]
CURRENT ASSETS
Cash and temporary cash investments	36	645
Special deposits	2	2
Accounts receivable - customers, less allowance for uncollectible accounts	1,260	1,064
Other receivables, less allowance for uncollectible accounts	60	71
Accrued unbilled revenue	326	384
Accounts receivable from affiliated companies	24	132
Fuel oil, gas in storage, materials and supplies, at average cost	272	312
Prepayments	404	126
Regulatory assets	51	132
Deferred tax assets	45	94
Other current assets	122	158
TOTAL CURRENT ASSETS	2,602	3,120
INVESTMENTS	278	271
UTILITY PLANT AT ORIGINAL COST
General	2,275	2,265
TOTAL	34,025	33,584
Less: Accumulated depreciation	7,048	6,970
Net	26,977	26,614
Construction work in progress	893	971
NET UTILITY PLANT	27,870	27,585
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	5	5
NET PLANT	27,875	27,590
OTHER NONCURRENT ASSETS
Regulatory assets	8,251	8,481
Other deferred charges and noncurrent assets	174	175
TOTAL OTHER NONCURRENT ASSETS	8,425	8,656
TOTAL ASSETS	39,180	39,637
CURRENT LIABILITIES
Long-term debt due within one year	350	350
Notes payable	268	450
Accounts payable	709	802
Accounts payable to affiliated companies	24	23
Customer deposits	331	330
Accrued taxes	46	46
Accrued taxes to affiliated companies	35	10
Accrued interest	156	117
Accrued wages	92	84
Fair value of derivative liabilities	23	48
Regulatory liabilities	212	142
Other current liabilities	377	415
TOTAL CURRENT LIABILITIES	2,623	2,817
NONCURRENT LIABILITIES
Provision for injuries and damages	178	176
Pensions and retiree benefits	3,222	3,493
Superfund and other environmental costs	662	666
Asset retirement obligations	187	185
Fair value of derivative liabilities	16	10
Deferred income taxes and investment tax credits	8,367	8,257
Regulatory liabilities	1,728	1,837
Other deferred credits and noncurrent liabilities	135	144
TOTAL NONCURRENT LIABILITIES	14,495	14,768
LONG-TERM DEBT	10,864	10,864
EQUITY
Common shareholders' equity	11,198	11,188
TOTAL LIABILITIES AND EQUITY	39,180	39,637
Electric [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	25,410	25,091
Electric [Member] | CECONY [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	23,902	23,599
Gas [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	6,223	6,102
Gas [Member] | CECONY [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	5,582	5,469
Steam [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	2,266	2,251
Steam [Member] | CECONY [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	$ 2,266	$ 2,251