Income Taxes (Components of Income Tax Expense (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal	$ (1)us-gaap_CurrentFederalTaxExpenseBenefit	$ (2)us-gaap_CurrentFederalTaxExpenseBenefit	$ (12)us-gaap_CurrentFederalTaxExpenseBenefit
State	19	(9)	16
Foreign	(1)us-gaap_CurrentForeignTaxExpenseBenefit	(1)us-gaap_CurrentForeignTaxExpenseBenefit	14us-gaap_CurrentForeignTaxExpenseBenefit
Total current	17us-gaap_CurrentIncomeTaxExpenseBenefit	(12)us-gaap_CurrentIncomeTaxExpenseBenefit	18us-gaap_CurrentIncomeTaxExpenseBenefit
Federal	0	1	11
State	(1)	4	(5)
Foreign	6	9	(5)
Total deferred	5us-gaap_DeferredIncomeTaxExpenseBenefit	14us-gaap_DeferredIncomeTaxExpenseBenefit	1us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit)	$ 22us-gaap_IncomeTaxExpenseBenefit	$ 2us-gaap_IncomeTaxExpenseBenefit	$ 19us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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