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Discontinued Operations - Operating Results for Retail Electric and Natural Gas Supply Businesses (Parenthetical) (Detail) (Pepco Energy Services [Member], Discontinued Operations [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pepco Energy Services [Member] \| Discontinued Operations [Member]
Income Statement by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, income tax expense	$ 0	$ 0

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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