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Income Taxes - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax at U.S. statutory rate	$ 1,223us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 1,093us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 1,169us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Foreign income tax rate differential	(261)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations	(216)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations	(149)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
State income tax, net of federal benefit	25us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	27us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	29us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Nondeductible expenses	24us-gaap_IncomeTaxReconciliationNondeductibleExpense	26us-gaap_IncomeTaxReconciliationNondeductibleExpense	29us-gaap_IncomeTaxReconciliationNondeductibleExpense
Tax benefit of manufacturing deduction	(37)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(33)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(29)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Foreign dividends, net of foreign tax credits	132us-gaap_IncomeTaxReconciliationDeductionsDividends	32us-gaap_IncomeTaxReconciliationDeductionsDividends	(116)us-gaap_IncomeTaxReconciliationDeductionsDividends
Change in deferred tax valuation allowance	(83)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	40us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	80us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	16us-gaap_OtherTaxExpenseBenefit	(26)us-gaap_OtherTaxExpenseBenefit	(48)us-gaap_OtherTaxExpenseBenefit
Total income tax provision	$ 1,039us-gaap_IncomeTaxExpenseBenefit	$ 943us-gaap_IncomeTaxExpenseBenefit	$ 965us-gaap_IncomeTaxExpenseBenefit

X

- Definition

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

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