Income Taxes (Income Tax Components) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax:
Federal	$ 248us-gaap_CurrentFederalTaxExpenseBenefit	$ 549us-gaap_CurrentFederalTaxExpenseBenefit	$ 229us-gaap_CurrentFederalTaxExpenseBenefit
State and local	33	24	25
Foreign	36us-gaap_CurrentForeignTaxExpenseBenefit	37us-gaap_CurrentForeignTaxExpenseBenefit	31us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax	317us-gaap_CurrentIncomeTaxExpenseBenefit	610us-gaap_CurrentIncomeTaxExpenseBenefit	285us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax:
Federal	202	(102)	37
State and local	30	(10)	15
Foreign	(4)	(6)	(2)
Total deferred income tax	228us-gaap_DeferredIncomeTaxExpenseBenefit	(118)us-gaap_DeferredIncomeTaxExpenseBenefit	50us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision	$ 545us-gaap_IncomeTaxExpenseBenefit	$ 492us-gaap_IncomeTaxExpenseBenefit	$ 335us-gaap_IncomeTaxExpenseBenefit

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