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Income Taxes - Difference Between Effective Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at federal statutory rate									$ 62us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 78us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 58us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign income tax rate differential									(6)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
State income tax, net of federal benefit									3us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	2us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible expenses									4us-gaap_IncomeTaxReconciliationNondeductibleExpense	2us-gaap_IncomeTaxReconciliationNondeductibleExpense	1us-gaap_IncomeTaxReconciliationNondeductibleExpense
Foreign dividends, net of foreign tax credits										(1)us-gaap_IncomeTaxReconciliationTaxCredits	1us-gaap_IncomeTaxReconciliationTaxCredits
Change in contingency reserve and other									(1)us-gaap_IncomeTaxReconciliationTaxContingenciesOther	(2)us-gaap_IncomeTaxReconciliationTaxContingenciesOther
Income tax expense (benefit)	$ 8us-gaap_IncomeTaxExpenseBenefit	$ 17us-gaap_IncomeTaxExpenseBenefit	$ 16us-gaap_IncomeTaxExpenseBenefit	$ 21us-gaap_IncomeTaxExpenseBenefit	$ 14us-gaap_IncomeTaxExpenseBenefit	$ 20us-gaap_IncomeTaxExpenseBenefit	$ 22us-gaap_IncomeTaxExpenseBenefit	$ 19us-gaap_IncomeTaxExpenseBenefit	$ 62us-gaap_IncomeTaxExpenseBenefit	$ 75us-gaap_IncomeTaxExpenseBenefit	$ 57us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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