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Short-Term Borrowing - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 519,000,000us-gaap_CommercialPaper	$ 800,000,000us-gaap_CommercialPaper
Weighted average interest rate	0.50%	0.40%
Letters of credit outstanding under the Credit Agreement	61,000,000	11,000,000
Loans outstanding under credit agreement	0us-gaap_LoansPayableCurrent	0us-gaap_LoansPayableCurrent
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper, outstanding	268,000,000	450,000,000
Weighted average interest rate	0.50%	0.40%
Letters of credit outstanding under the Credit Agreement	$ 11,000,000	$ 11,000,000

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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