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CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts receivable - customers, allowance for uncollectible accounts $ 94 $ 94
Other receivables, allowance for uncollectible accounts 10 10
Non-utility property, accumulated depreciation 73 68
Intangible assets, accumulated amortization 4 4
CECONY [Member]
   
Accounts receivable - customers, allowance for uncollectible accounts 87 87
Other receivables, allowance for uncollectible accounts 8 9
Non-utility property, accumulated depreciation $ 25 $ 25