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Short-Term Borrowing - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Short-term Debt [Line Items]
Weighted average interest rate	0.30%
Consolidated Edison Inc [Member]
Short-term Debt [Line Items]
Commercial paper outstanding	340
Letters of credit outstanding under the Credit Agreement	207
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper outstanding	332
Letters of credit outstanding under the Credit Agreement	192

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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