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Acquisitions and Dispositions (Schedule of Disposal Groups, Including Discontinued Operations, Income Statement) (Details) (Brayton Point and Kincaid, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Brayton Point and Kincaid
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Operating revenue	$ 154
Income before income taxes	$ 1

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income 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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