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Income Taxes Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Income tax expense $ 9us-gaap_IncomeTaxExpenseBenefit $ 50us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate