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Discontinued Operations (Summarized Results of Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 16, 2012
Summarized results of discontinued operations:
Operating revenue	$ 0	$ 0	$ 1,626
Loss before income taxes	$ (525)	$ 0	$ (2,235)

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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