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Short-Term Borrowing - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 1,425	$ 1,451
Weighted average interest rate	0.20%	0.20%
Letters of credit outstanding under the credit agreement	11	26
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper, outstanding	1,201	1,210
Weighted average interest rate	0.20%	0.20%
Letters of credit outstanding under the credit agreement	$ 11	$ 11

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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