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Income Taxes Level 4 Effective Income Tax Rate Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]      
Income Tax Examination, Interest Expense $ 0us-gaap_IncomeTaxExaminationInterestExpense $ 5us-gaap_IncomeTaxExaminationInterestExpense $ 0us-gaap_IncomeTaxExaminationInterestExpense
Interest Payable 1us-gaap_InterestPayableCurrentAndNoncurrent    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 595us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 515us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (31)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount 138us-gaap_IncomeTaxReconciliationTaxExemptIncome 138us-gaap_IncomeTaxReconciliationTaxExemptIncome 141us-gaap_IncomeTaxReconciliationTaxExemptIncome
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount 114us-gaap_IncomeTaxReconciliationDeductionsDividends 139us-gaap_IncomeTaxReconciliationDeductionsDividends 145us-gaap_IncomeTaxReconciliationDeductionsDividends
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 5us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (2)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 2us-gaap_IncomeTaxReconciliationOtherAdjustments 10us-gaap_IncomeTaxReconciliationOtherAdjustments 8us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense (Benefit) 350us-gaap_IncomeTaxExpenseBenefit 246us-gaap_IncomeTaxExpenseBenefit (309)us-gaap_IncomeTaxExpenseBenefit
Valuation Allowance of Deferred Tax Assets [Member]      
Income Tax Contingency [Line Items]      
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   $ (2)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 $ (25)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember