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Income Taxes - Income Tax Benefit (Provision) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal	$ 21us-gaap_CurrentFederalTaxExpenseBenefit	$ 24us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State and local	(9)	(3)	15
International	(11)us-gaap_CurrentForeignTaxExpenseBenefit	1us-gaap_CurrentForeignTaxExpenseBenefit	(14)us-gaap_CurrentForeignTaxExpenseBenefit
Federal	(424)	7,197	(4)
State and local	10	794	(13)
Income Tax (Provision) Benefit	$ (413)us-gaap_IncomeTaxExpenseBenefit	$ 8,013us-gaap_IncomeTaxExpenseBenefit	$ (16)us-gaap_IncomeTaxExpenseBenefit

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

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

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

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