Income Taxes (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]
United States	$ 14us-gaap_CurrentFederalTaxExpenseBenefit	$ 29us-gaap_CurrentFederalTaxExpenseBenefit	$ 5us-gaap_CurrentFederalTaxExpenseBenefit
Other nations	67us-gaap_CurrentForeignTaxExpenseBenefit	234us-gaap_CurrentForeignTaxExpenseBenefit	91us-gaap_CurrentForeignTaxExpenseBenefit
States (U.S.)	11	12	1
Current income tax expense	92us-gaap_CurrentIncomeTaxExpenseBenefit	275us-gaap_CurrentIncomeTaxExpenseBenefit	97us-gaap_CurrentIncomeTaxExpenseBenefit
United States	(503)	(368)	192
Other nations	(11)	35	(29)
States (U.S.)	(43)	(1)	(49)
Deferred income tax expense (benefit)	(557)us-gaap_DeferredIncomeTaxExpenseBenefit	(334)us-gaap_DeferredIncomeTaxExpenseBenefit	114us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit)	$ (465)us-gaap_IncomeTaxExpenseBenefit	$ (59)us-gaap_IncomeTaxExpenseBenefit	$ 211us-gaap_IncomeTaxExpenseBenefit

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

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