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Short-Term Borrowing - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 1,400	$ 539
Weighted average interest rate	0.30%	0.30%
Loans outstanding under the credit agreement
Letters of credit outstanding under the credit agreement	34	131
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper, outstanding	1,230	421
Weighted average interest rate	0.30%	0.30%
Letters of credit outstanding under the credit agreement	$ 11	$ 121

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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