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Income Taxes Reconciliation of Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Federal	$ 3,883	$ 3,004	$ 2,638
State and local	271	237	150
Total current provision	4,154us-gaap_CurrentIncomeTaxExpenseBenefit	3,241us-gaap_CurrentIncomeTaxExpenseBenefit	2,788us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision	(117)us-gaap_DeferredIncomeTaxExpenseBenefit	1us-gaap_DeferredIncomeTaxExpenseBenefit	308us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision for income taxes	$ 4,037us-gaap_IncomeTaxExpenseBenefit	$ 3,242us-gaap_IncomeTaxExpenseBenefit	$ 3,096us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.