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Income Taxes Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Income tax expense $ 49us-gaap_IncomeTaxExpenseBenefit $ 103us-gaap_IncomeTaxExpenseBenefit
Income before income tax expense $ 471us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ 180us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Effective income tax rate 10.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 57.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate