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Income Taxes - Components (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal									$ (35)us-gaap_CurrentFederalTaxExpenseBenefit	$ 102us-gaap_CurrentFederalTaxExpenseBenefit	$ 238us-gaap_CurrentFederalTaxExpenseBenefit
State and local									(222)	35	173
Foreign									16us-gaap_CurrentForeignTaxExpenseBenefit	17us-gaap_CurrentForeignTaxExpenseBenefit	(28)us-gaap_CurrentForeignTaxExpenseBenefit
Total current									(241)us-gaap_CurrentIncomeTaxExpenseBenefit	154us-gaap_CurrentIncomeTaxExpenseBenefit	383us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred									185us-gaap_DeferredIncomeTaxExpenseBenefit	2us-gaap_DeferredIncomeTaxExpenseBenefit	39us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit)	$ 30us-gaap_IncomeTaxExpenseBenefit	$ (29)us-gaap_IncomeTaxExpenseBenefit	$ (206)us-gaap_IncomeTaxExpenseBenefit	$ 149us-gaap_IncomeTaxExpenseBenefit	$ (72)us-gaap_IncomeTaxExpenseBenefit	$ 32us-gaap_IncomeTaxExpenseBenefit	$ 71us-gaap_IncomeTaxExpenseBenefit	$ 125us-gaap_IncomeTaxExpenseBenefit	$ (56)us-gaap_IncomeTaxExpenseBenefit	$ 156us-gaap_IncomeTaxExpenseBenefit	$ 422us-gaap_IncomeTaxExpenseBenefit

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

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

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

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