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Income Taxes (Current and deferred components of the Company's 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 Expense (Benefit), Continuing Operations [Abstract]
Current tax (expense) benefit	$ (318)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (292)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (94)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax (expense) benefit	(1)us-gaap_DeferredIncomeTaxExpenseBenefit	(69)us-gaap_DeferredIncomeTaxExpenseBenefit	(145)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (expense) benefit	$ (319)us-gaap_IncomeTaxExpenseBenefit	$ (361)us-gaap_IncomeTaxExpenseBenefit	$ (239)us-gaap_IncomeTaxExpenseBenefit

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

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