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Incomes 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]      
United States, current federal tax expense (benefit) $ 7us-gaap_CurrentFederalTaxExpenseBenefit $ (60)us-gaap_CurrentFederalTaxExpenseBenefit $ 18us-gaap_CurrentFederalTaxExpenseBenefit
Current foreign tax expense (benefit) 182us-gaap_CurrentForeignTaxExpenseBenefit 187us-gaap_CurrentForeignTaxExpenseBenefit 189us-gaap_CurrentForeignTaxExpenseBenefit
Current state and local tax expense (benefit) (2)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2us-gaap_CurrentStateAndLocalTaxExpenseBenefit 7us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit) 187us-gaap_CurrentIncomeTaxExpenseBenefit 129us-gaap_CurrentIncomeTaxExpenseBenefit 214us-gaap_CurrentIncomeTaxExpenseBenefit
United States, deferred federal income tax expense (benefit) 8us-gaap_DeferredFederalIncomeTaxExpenseBenefit (57)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 24us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred foreign income tax expense (benefit) 12us-gaap_DeferredForeignIncomeTaxExpenseBenefit (9)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (96)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred state and local income tax expense (benefit) (18)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 5us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (9)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) 2us-gaap_DeferredIncomeTaxExpenseBenefit (61)us-gaap_DeferredIncomeTaxExpenseBenefit (81)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 189us-gaap_IncomeTaxExpenseBenefit $ 68us-gaap_IncomeTaxExpenseBenefit $ 133us-gaap_IncomeTaxExpenseBenefit