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Income Taxes - Current and Deferred Components of Income Tax Expense (Benefit) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax expense (benefit):
Federal income tax expense (benefit), Current	$ 370us-gaap_CurrentFederalTaxExpenseBenefit	$ 705us-gaap_CurrentFederalTaxExpenseBenefit	$ 180us-gaap_CurrentFederalTaxExpenseBenefit
Federal income tax expense (benefit), Deferred	(23)	(232)	199
State and city income tax expense (benefit), Current	12	19	19
State and city income tax expense (benefit), Deferred	6	1	5
Foreign income tax expense (benefit)	92	163	110
Income tax expense	$ 457us-gaap_IncomeTaxExpenseBenefit	$ 656us-gaap_IncomeTaxExpenseBenefit	$ 513us-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 state and local tax expense (benefit) pertaining to income (loss) from continuing operations.