Income Tax (Provision for Income Tax from Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 901us-gaap_CurrentFederalTaxExpenseBenefit	$ 789us-gaap_CurrentFederalTaxExpenseBenefit	$ 675us-gaap_CurrentFederalTaxExpenseBenefit
State and local	3	2	2
Foreign	74us-gaap_CurrentForeignTaxExpenseBenefit	176us-gaap_CurrentForeignTaxExpenseBenefit	176us-gaap_CurrentForeignTaxExpenseBenefit
Subtotal	978us-gaap_CurrentIncomeTaxExpenseBenefit	967us-gaap_CurrentIncomeTaxExpenseBenefit	853us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	538	(411)	346
Foreign	16	125	(144)
Subtotal	554us-gaap_DeferredIncomeTaxExpenseBenefit	(286)us-gaap_DeferredIncomeTaxExpenseBenefit	202us-gaap_DeferredIncomeTaxExpenseBenefit
Current and Deferred:
Provision for income tax expense (benefit)	$ 1,532us-gaap_IncomeTaxExpenseBenefit	$ 681us-gaap_IncomeTaxExpenseBenefit	$ 1,055us-gaap_IncomeTaxExpenseBenefit

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

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