Financial Instruments - Summary of Fair Value of Company's Derivative Contracts (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fair Value Asset	$ 2	$ 15
Derivative liabilities, Fair Value	(6)	(4)
Interest rate swaps [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset
Interest rate swaps [Member] | Accrued expenses and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Fair Value	(1)	(3)
Foreign currency contracts [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset	2	10
Foreign currency contracts [Member] | Accrued expenses and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Fair Value	(5)	(1)
Foreign currency contracts [Member] | Other non-current assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset		5
Foreign currency contracts [Member] | Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Fair Value