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Derivative Instruments and Risk Management - Summary of Foreign Currency Forward Exchange Contracts Which Have Not Been Designated as Hedging Instruments, and Their Impact on the Income Statement (Detail) (Not Designated as Hedging Instrument [Member], Foreign currency forward exchange contracts [Member], Other income/(expense) [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Not Designated as Hedging Instrument [Member] | Foreign currency forward exchange contracts [Member] | Other income/(expense) [Member]
Summary of foreign currency forward exchange contracts which have not been designated as hedging instruments, and their impact on the income statement
Amount of Gain/(Loss) Recognized in Income	$ 1

X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

+ Details

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Period Type:	duration

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- Details

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