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Income Taxes (Schedule Of Income Tax Expense/(Benefit)) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal $ 676us-gaap_CurrentFederalTaxExpenseBenefit $ (82)us-gaap_CurrentFederalTaxExpenseBenefit $ 657us-gaap_CurrentFederalTaxExpenseBenefit
Non-U.S. 91us-gaap_CurrentForeignTaxExpenseBenefit 76us-gaap_CurrentForeignTaxExpenseBenefit 52us-gaap_CurrentForeignTaxExpenseBenefit
U.S. state 69us-gaap_CurrentStateAndLocalTaxExpenseBenefit 11us-gaap_CurrentStateAndLocalTaxExpenseBenefit 19us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total Current Income Tax Expense (Benefit) 836us-gaap_CurrentIncomeTaxExpenseBenefit 5us-gaap_CurrentIncomeTaxExpenseBenefit 728us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal 828us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,531us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,209us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Non-U.S. 34us-gaap_DeferredForeignIncomeTaxExpenseBenefit 41us-gaap_DeferredForeignIncomeTaxExpenseBenefit (13)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
U.S. state (7)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 69us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 83us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred 855us-gaap_DeferredIncomeTaxExpenseBenefit 1,641us-gaap_DeferredIncomeTaxExpenseBenefit 1,279us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Total income tax expense $ 1,691us-gaap_IncomeTaxExpenseBenefit $ 1,646us-gaap_IncomeTaxExpenseBenefit $ 2,007us-gaap_IncomeTaxExpenseBenefit