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Consolidated Statements of Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
EPS impact of recast Brayton Point and Kincaid discontinued operations	$ 1.92	$ 0.06
Discontinued operation tax expense	$ 692,000,000	$ 33,000,000

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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