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Provision for Income Taxes Provision for Income Taxes (Schedule of Current and Deferred Income Tax Expense) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Current U.S. federal tax expense (benefit), on continuing operations $ 778us-gaap_CurrentFederalTaxExpenseBenefit $ 160us-gaap_CurrentFederalTaxExpenseBenefit $ 121us-gaap_CurrentFederalTaxExpenseBenefit
Current U.S. state and local tax expense (benefit), on continuing operations 62us-gaap_CurrentStateAndLocalTaxExpenseBenefit 23us-gaap_CurrentStateAndLocalTaxExpenseBenefit 16us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current international tax expense (benefit), on continuing operations 516us-gaap_CurrentForeignTaxExpenseBenefit 677us-gaap_CurrentForeignTaxExpenseBenefit 663us-gaap_CurrentForeignTaxExpenseBenefit
Total current tax expense, on continuing operations 1,356us-gaap_CurrentIncomeTaxExpenseBenefit 860us-gaap_CurrentIncomeTaxExpenseBenefit 800us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred U.S. federal tax expense (benefit), on continuing operations 81us-gaap_DeferredFederalIncomeTaxExpenseBenefit (193)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (105)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred U.S. state and local tax expense (benefit), on continuing operations (44)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (65)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (46)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred international tax expense (benefit), on continuing operations (23)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 24us-gaap_DeferredForeignIncomeTaxExpenseBenefit (33)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred tax expense (benefit), on continuing operations 14us-gaap_DeferredIncomeTaxExpenseBenefit (234)us-gaap_DeferredIncomeTaxExpenseBenefit (184)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes on continuing operations $ 1,370us-gaap_IncomeTaxExpenseBenefit $ 626us-gaap_IncomeTaxExpenseBenefit $ 616us-gaap_IncomeTaxExpenseBenefit