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Discontinued Operations - Income (Loss) from Discontinued Operations, Net of Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes		$ (319)
Cross-Border Energy Lease Investments [Member]
Schedule of Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes		(320)
Retail Electric and Natural Gas Supply Businesses of Pepco Energy Services [Member]
Schedule of Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes		$ 1

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, 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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