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Income Taxes Level 4 Income (loss) Continuing Operations (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Income (loss) from continuing operations before income taxes, domestic $ 1,736us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 1,473us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (106)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income (loss) from continuing operations before income taxes, foreign (37)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (2)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 17us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Current - U.S. Federal income tax expense (benefit) (62)us-gaap_CurrentFederalTaxExpenseBenefit 219us-gaap_CurrentFederalTaxExpenseBenefit 33us-gaap_CurrentFederalTaxExpenseBenefit
Current - International income tax expense (benefit) 2us-gaap_CurrentForeignTaxExpenseBenefit 0us-gaap_CurrentForeignTaxExpenseBenefit 0us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax expense (benefit) (60)us-gaap_CurrentIncomeTaxExpenseBenefit 219us-gaap_CurrentIncomeTaxExpenseBenefit 33us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred - U.S. Federal income tax expense (benefit) excluding NOL carryforward 410us-gaap_DeferredFederalIncomeTaxExpenseBenefit 27us-gaap_DeferredFederalIncomeTaxExpenseBenefit (342)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Income Tax Expense (Benefit) $ 350us-gaap_IncomeTaxExpenseBenefit $ 246us-gaap_IncomeTaxExpenseBenefit $ (309)us-gaap_IncomeTaxExpenseBenefit