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Income Taxes - Components of Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 681us-gaap_CurrentFederalTaxExpenseBenefit	$ 632us-gaap_CurrentFederalTaxExpenseBenefit	$ 654us-gaap_CurrentFederalTaxExpenseBenefit
State	43us-gaap_CurrentStateAndLocalTaxExpenseBenefit	55us-gaap_CurrentStateAndLocalTaxExpenseBenefit	44us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	615us-gaap_CurrentForeignTaxExpenseBenefit	592us-gaap_CurrentForeignTaxExpenseBenefit	357us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax provision	1,339us-gaap_CurrentIncomeTaxExpenseBenefit	1,279us-gaap_CurrentIncomeTaxExpenseBenefit	1,055us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(309)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(157)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(147)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	(5)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(12)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(1)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	14us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(167)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	58us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred income tax provision	(300)us-gaap_DeferredIncomeTaxExpenseBenefit	(336)us-gaap_DeferredIncomeTaxExpenseBenefit	(90)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision	$ 1,039us-gaap_IncomeTaxExpenseBenefit	$ 943us-gaap_IncomeTaxExpenseBenefit	$ 965us-gaap_IncomeTaxExpenseBenefit

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