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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]
Federal	$ 1,006us-gaap_CurrentFederalTaxExpenseBenefit	$ 595us-gaap_CurrentFederalTaxExpenseBenefit	$ 708us-gaap_CurrentFederalTaxExpenseBenefit
States and Puerto Rico	81	53	61
Total current provision	1,087us-gaap_CurrentIncomeTaxExpenseBenefit	648us-gaap_CurrentIncomeTaxExpenseBenefit	769us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (benefit) provision	(64)us-gaap_DeferredIncomeTaxExpenseBenefit	42us-gaap_DeferredIncomeTaxExpenseBenefit	(80)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 1,023us-gaap_IncomeTaxExpenseBenefit	$ 690us-gaap_IncomeTaxExpenseBenefit	$ 689us-gaap_IncomeTaxExpenseBenefit

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

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.