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Income Taxes (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current taxes:      
Federal $ 265us-gaap_CurrentFederalTaxExpenseBenefit $ 308us-gaap_CurrentFederalTaxExpenseBenefit $ 146us-gaap_CurrentFederalTaxExpenseBenefit
State 8us-gaap_CurrentStateAndLocalTaxExpenseBenefit 5us-gaap_CurrentStateAndLocalTaxExpenseBenefit 6us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred taxes:      
Federal (53)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (77)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (17)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Provision for income taxes as shown in the Statement of Earnings $ 220us-gaap_IncomeTaxExpenseBenefit $ 236us-gaap_IncomeTaxExpenseBenefit $ 135us-gaap_IncomeTaxExpenseBenefit