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