Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative designated as hedging instrument [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Derivative Asset		$ 15
Derivative Liability	1
Derivative designated as hedging instrument [Member] | Forward contracts [Member] | Prepaid expenses and other [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Derivative Asset		3
Derivative designated as hedging instrument [Member] | Forward contracts [Member] | Accrued expenses [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Derivative Liability	1
Derivative designated as hedging instrument [Member] | Interest rate swaps [Member] | Other assets [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Derivative Asset		12
Derivatives not designated as hedging instruments [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Derivative Asset	2
Derivatives not designated as hedging instruments [Member] | Forward contracts [Member] | Prepaid expenses and other [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Derivative Asset	$ 2