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Income Taxes - Benefit for Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Current income tax provision                 $ 1,879,000,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 3,067,000,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax provision (benefit)                 5,062,000,000us-gaap_DeferredIncomeTaxExpenseBenefit (48,482,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit 0us-gaap_DeferredIncomeTaxExpenseBenefit
Provision (benefit) for federal income taxes 818,000,000us-gaap_IncomeTaxExpenseBenefit 1,787,000,000us-gaap_IncomeTaxExpenseBenefit 1,752,000,000us-gaap_IncomeTaxExpenseBenefit 2,584,000,000us-gaap_IncomeTaxExpenseBenefit 1,816,000,000us-gaap_IncomeTaxExpenseBenefit 1,355,000,000us-gaap_IncomeTaxExpenseBenefit 1,985,000,000us-gaap_IncomeTaxExpenseBenefit (50,571,000,000)us-gaap_IncomeTaxExpenseBenefit 6,941,000,000us-gaap_IncomeTaxExpenseBenefit (45,415,000,000)us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                      
Statutory corporate tax rate                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Equity investments in affordable housing projects                 (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment (3.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
Other                 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance                 (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (151.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (30.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective tax rate                 32.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations (117.80%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount                   $ (58,300,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance $ (5,300,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance