CONSOLIDATED BALANCE SHEET (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and temporary cash investments	$ 747	$ 394
Special deposits	405	70
Accounts receivable-customers, less allowance for uncollectible accounts	1,211	1,222
Other receivables, less allowance for uncollectible accounts	310	228
Accrued unbilled revenue	487	516
Fuel oil, gas in storage, materials and supplies, at average cost	321	330
Prepayments	119	159
Regulatory assets	56	74
Deferred tax assets - current	283	296
Other current assets	164	162
TOTAL CURRENT ASSETS	4,103	3,451
INVESTMENTS	313	467
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	486	555
Construction work in progress	102	83
NET PLANT	27,542	26,939
UTILITY PLANT, AT ORIGINAL COST
General	2,295	2,302
TOTAL	32,512	31,847
Less: Accumulated depreciation	6,837	6,573
Net	25,675	25,274
Construction work in progress	1,279	1,027
NET UTILITY PLANT	26,954	26,301
OTHER NONCURRENT ASSETS
Goodwill	429	429
Intangible assets, less accumulated amortization of $4 in 2013 and 2012	4	2
Regulatory assets	9,304	9,705
Other deferred charges and noncurrent assets	227	216
TOTAL OTHER NONCURRENT ASSETS	9,964	10,352
TOTAL ASSETS	41,922	41,209
CURRENT LIABILITIES
Long-term debt due within one year	483	706
Notes payable	1,400	539
Accounts payable	997	1,215
Customer deposits	310	304
Accrued taxes	322	162
Accrued interest	277	153
Accrued wages	93	94
Fair value of derivative liabilities	31	47
Uncertain income tax liabilities	13	44
Regulatory liabilities	88	183
Other current liabilities	490	498
TOTAL CURRENT LIABILITIES	4,504	3,945
NONCURRENT LIABILITIES
Obligations under capital leases	2	2
Provision for injuries and damages	144	149
Pensions and retiree benefits	4,333	4,678
Superfund and other environmental costs	522	545
Asset retirement obligations	162	159
Fair value of derivative liabilities	32	31
Uncertain income tax liabilities	3
Other noncurrent liabilities	117	125
TOTAL NONCURRENT LIABILITIES	5,315	5,689
DEFERRED CREDITS AND REGULATORY LIABILITIES
Deferred income taxes and investment tax credits	8,280	8,372
Regulatory liabilities	1,393	1,202
Other deferred credits	53	70
TOTAL DEFERRED CREDITS AND REGULATORY LIABILITIES	9,726	9,644
LONG-TERM DEBT	10,494	10,062
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	11,883	11,869
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	41,922	41,209
CECONY [Member]
CURRENT ASSETS
Cash and temporary cash investments	683	353
Special deposits	86	65
Accounts receivable-customers, less allowance for uncollectible accounts	1,086	1,108
Other receivables, less allowance for uncollectible accounts	88	106
Accrued unbilled revenue	390	406
Accounts receivable from affiliated companies	46	61
Fuel oil, gas in storage, materials and supplies, at average cost	283	285
Prepayments	89	81
Regulatory assets	51	60
Deferred tax assets - current	179	193
Other current assets	58	69
TOTAL CURRENT ASSETS	3,039	2,787
INVESTMENTS	232	207
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	6	6
NET PLANT	25,373	24,745
UTILITY PLANT, AT ORIGINAL COST
General	2,118	2,126
TOTAL	30,434	29,801
Less: Accumulated depreciation	6,253	6,009
Net	24,181	23,792
Construction work in progress	1,186	947
NET UTILITY PLANT	25,367	24,739
OTHER NONCURRENT ASSETS
Regulatory assets	8,595	8,972
Other deferred charges and noncurrent assets	185	174
TOTAL OTHER NONCURRENT ASSETS	8,780	9,146
TOTAL ASSETS	37,424	36,885
CURRENT LIABILITIES
Long-term debt due within one year	475	700
Notes payable	1,230	421
Accounts payable	799	989
Accounts payable to affiliated companies	20	22
Customer deposits	298	292
Accrued taxes	27	37
Accrued taxes to affiliated companies	111	215
Accrued interest	137	133
Accrued wages	86	84
Fair value of derivative liabilities	23	28
Uncertain income tax liabilities	7	36
Regulatory liabilities	54	145
Other current liabilities	424	410
TOTAL CURRENT LIABILITIES	3,691	3,512
NONCURRENT LIABILITIES
Obligations under capital leases	2	2
Provision for injuries and damages	137	141
Pensions and retiree benefits	3,877	4,220
Superfund and other environmental costs	413	433
Asset retirement obligations	162	158
Fair value of derivative liabilities	10	11
Other noncurrent liabilities	110	115
TOTAL NONCURRENT LIABILITIES	4,711	5,080
DEFERRED CREDITS AND REGULATORY LIABILITIES
Deferred income taxes and investment tax credits	7,721	7,452
Regulatory liabilities	1,269	1,077
Other deferred credits	49	67
TOTAL DEFERRED CREDITS AND REGULATORY LIABILITIES	9,039	8,596
LONG-TERM DEBT	9,365	9,145
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	10,618	10,552
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	37,424	36,885
Electric Transmission [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	22,823	22,376
Electric Transmission [Member] | CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	21,505	21,079
Gas Transmission [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	5,288	5,120
Gas Transmission [Member] | CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	4,705	4,547
Steam Plant [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,106	2,049
Steam Plant [Member] | CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,106	$ 2,049