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Income Taxes (Breakdown of Provision for Income Taxes) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current expense:      
Federal $ 551us-gaap_CurrentFederalTaxExpenseBenefit $ 1,007us-gaap_CurrentFederalTaxExpenseBenefit $ 275us-gaap_CurrentFederalTaxExpenseBenefit
State 82us-gaap_CurrentStateAndLocalTaxExpenseBenefit 100us-gaap_CurrentStateAndLocalTaxExpenseBenefit 70us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current expense 633us-gaap_CurrentIncomeTaxExpenseBenefit 1,107us-gaap_CurrentIncomeTaxExpenseBenefit 345us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense:      
Federal 115us-gaap_DeferredFederalIncomeTaxExpenseBenefit 256us-gaap_DeferredFederalIncomeTaxExpenseBenefit 396us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 12us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 32us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 23us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred expense 127us-gaap_DeferredIncomeTaxExpenseBenefit 288us-gaap_DeferredIncomeTaxExpenseBenefit 419us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense      
Provision for income taxes $ 760us-gaap_IncomeTaxExpenseBenefit $ 1,395us-gaap_IncomeTaxExpenseBenefit $ 764us-gaap_IncomeTaxExpenseBenefit