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Federal and Foreign Income Tax - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income before federal and foreign income taxes from U.S. operations $ 2,424us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 2,766us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 1,373us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income before federal and foreign income taxes from foreign operations 437us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 471us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 623us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Deferred income tax assets valuation allowance $ 13us-gaap_DeferredTaxAssetsValuationAllowance $ 13us-gaap_DeferredTaxAssetsValuationAllowance