Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
NON-UTILITY PROPERTY
Non-utility property, less accumulated depreciation	$ 349	$ 605
Construction work in progress	82	36
NET PLANT	29,239	28,436
OTHER NONCURRENT ASSETS
Goodwill	429	429
Intangible assets, less accumulated amortization of $5 and $4 in 2014 and 2013, respectively	3	4
Regulatory assets	6,552	7,201
Other deferred charges and noncurrent assets	185	225
TOTAL OTHER NONCURRENT ASSETS	7,169	7,859
TOTAL ASSETS	40,667	40,647
CURRENT ASSETS
Cash and temporary cash investments	205	674
Special deposits	8	327
Accounts receivable-customers, less allowance for uncollectible accounts	1,280	1,251
Other receivables, less allowance for uncollectible accounts	198	240
Accrued unbilled revenue	456	514
Fuel oil, gas in storage, materials and supplies, at average cost	343	363
Prepayments	644	136
Regulatory assets	14	29
Deferred tax assets - current	33	122
Other current assets	338	235
TOTAL CURRENT ASSETS	3,519	3,891
INVESTMENTS	740	461
UTILITY PLANT AT ORIGINAL COST
General	2,437	2,336
TOTAL	35,391	33,474
Less: Accumulated depreciation	7,482	7,072
Net	27,909	26,402
Construction work in progress	899	1,393
NET UTILITY PLANT	28,808	27,795
CURRENT LIABILITIES
Long-term debt due within one year	210	485
Notes payable	1,425	1,451
Accounts payable	972	1,017
Customer deposits	338	321
Accrued taxes	48	476
Accrued interest	164	249
Accrued wages	97	92
Fair value of derivative liabilities	7	13
Regulatory liabilities	194	148
Other current liabilities	418	478
TOTAL CURRENT LIABILITIES	3,873	4,730
NONCURRENT LIABILITIES
Obligations under capital leases	1	1
Provision for injuries and damages	188	195
Pensions and retiree benefits	1,106	1,727
Superfund and other environmental costs	734	749
Asset retirement obligations	150	143
Fair value of derivative liabilities	3	5
Deferred income taxes and investment tax credits	8,817	8,466
Regulatory liabilities	1,901	1,728
Other deferred credits and noncurrent liabilities	193	169
TOTAL NONCURRENT LIABILITIES	13,093	13,183
LONG-TERM DEBT	10,985	10,489
EQUITY
Common Shareholder's Equity (See Statement of Equity)	12,707	12,245
Noncontrolling interest	9
TOTAL EQUITY (See Statement of Equity)	12,716	12,245
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	40,667	40,647
CECONY [Member]
NON-UTILITY PROPERTY
Non-utility property, less accumulated depreciation	5	4
NET PLANT	27,103	26,150
OTHER NONCURRENT ASSETS
Regulatory assets	6,011	6,639
Other deferred charges and noncurrent assets	132	146
TOTAL OTHER NONCURRENT ASSETS	6,143	6,785
TOTAL ASSETS	36,488	36,258
CURRENT ASSETS
Cash and temporary cash investments	45	633
Special deposits	2	86
Accounts receivable-customers, less allowance for uncollectible accounts	1,134	1,123
Other receivables, less allowance for uncollectible accounts	120	127
Accrued unbilled revenue	364	405
Accounts receivable from affiliated companies	352	119
Fuel oil, gas in storage, materials and supplies, at average cost	274	300
Prepayments	455	102
Regulatory assets	12	26
Deferred tax assets - current	14	100
Other current assets	198	55
TOTAL CURRENT ASSETS	2,970	3,076
INVESTMENTS	272	247
UTILITY PLANT AT ORIGINAL COST
General	2,247	2,154
TOTAL	33,112	31,312
Less: Accumulated depreciation	6,846	6,469
Net	26,266	24,843
Construction work in progress	832	1,303
NET UTILITY PLANT	27,098	26,146
CURRENT LIABILITIES
Long-term debt due within one year		475
Notes payable	1,201	1,210
Accounts payable	737	824
Accounts payable to affiliated companies	26	45
Customer deposits	324	308
Accrued taxes	39	46
Accrued taxes to affiliated companies	232	413
Accrued interest	140	139
Accrued wages	92	82
Fair value of derivative liabilities	2	12
Regulatory liabilities	149	107
Other current liabilities	346	385
TOTAL CURRENT LIABILITIES	3,288	4,046
NONCURRENT LIABILITIES
Obligations under capital leases	1	1
Provision for injuries and damages	178	180
Pensions and retiree benefits	877	1,453
Superfund and other environmental costs	636	644
Asset retirement obligations	147	143
Fair value of derivative liabilities	2	3
Deferred income taxes and investment tax credits	8,041	7,832
Regulatory liabilities	1,738	1,598
Other deferred credits and noncurrent liabilities	145	145
TOTAL NONCURRENT LIABILITIES	11,765	11,999
LONG-TERM DEBT	10,216	9,366
EQUITY
Common Shareholder's Equity (See Statement of Equity)	11,219	10,847
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	36,488	36,258
Electric [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	24,776	23,450
Electric [Member] | CECONY [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	23,309	22,073
Gas [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	5,945	5,494
Gas [Member] | CECONY [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	5,323	4,891
Steam [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	2,233	2,194
Steam [Member] | CECONY [Member]
UTILITY PLANT AT ORIGINAL COST
Utility plant, at original cost	$ 2,233	$ 2,194