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Income Taxes - Components of the Provision for Income Taxes (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
U.S. Federal:
Current									$ 38us-gaap_CurrentFederalTaxExpenseBenefit	$ 48us-gaap_CurrentFederalTaxExpenseBenefit	$ 46us-gaap_CurrentFederalTaxExpenseBenefit
Deferred									3us-gaap_DeferredFederalIncomeTaxExpenseBenefit	6us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(4)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
U.S. Federal, Total									41us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	54us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	42us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
U.S. State:
Current									4us-gaap_CurrentStateAndLocalTaxExpenseBenefit	4us-gaap_CurrentStateAndLocalTaxExpenseBenefit	4us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred											1us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
U.S. State, Total									4us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	4us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	5us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign
Current									18us-gaap_CurrentForeignTaxExpenseBenefit	20us-gaap_CurrentForeignTaxExpenseBenefit	14us-gaap_CurrentForeignTaxExpenseBenefit
Deferred									(1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(3)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(4)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign, Total									17us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations	17us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations	10us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
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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