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Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current, Federal	$ 916us-gaap_CurrentFederalTaxExpenseBenefit	$ 827us-gaap_CurrentFederalTaxExpenseBenefit	$ 604us-gaap_CurrentFederalTaxExpenseBenefit
Current, State	102	86	58
Current, Foreign	52us-gaap_CurrentForeignTaxExpenseBenefit	44us-gaap_CurrentForeignTaxExpenseBenefit	43us-gaap_CurrentForeignTaxExpenseBenefit
Deferred, Federal	3	(53)	167
Deferred, State	(5)	20	(8)
Deferred, Foreign	40	26	24
Provision for income taxes	$ 1,108us-gaap_IncomeTaxExpenseBenefit	$ 950us-gaap_IncomeTaxExpenseBenefit	$ 888us-gaap_IncomeTaxExpenseBenefit

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

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

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

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

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