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Consolidated Statements of Operations (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income	$ 13us-gaap_InvestmentIncomeInterest	$ 8us-gaap_InvestmentIncomeInterest	$ 7us-gaap_InvestmentIncomeInterest
Income (loss) from discontinued operations, income tax (provision) benefit	$ (9)	$ 1	$ 82

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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