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Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income	$ 3us-gaap_InvestmentIncomeInterest	$ 3us-gaap_InvestmentIncomeInterest
Income (loss) from discontinued operations, income tax benefit (provision)	$ 2	$ 1

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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