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Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		$ 1
Derivative designated as hedging instrument [Member] \| Forward contracts [Member] \| Accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability		1
Derivatives not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	2
Derivative Asset	3	2
Derivatives not designated as hedging instruments [Member] \| Forward contracts [Member] \| Accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	2
Derivatives not designated as hedging instruments [Member] \| Forward contracts [Member] \| Prepaid expenses and other [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 3	$ 2

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details