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Discontinued Operations And Dispositions (Narrative) (Details) (Power [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2011 MW
Power [Member]
Sale of gas-fired generation facilities	1,000
Total purchase price of plant sale	$ 351
Gain on disposal of discontinued operations, after tax	$ 53

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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