Financial Instruments - Impact of Changes in Fair Values of Derivatives (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized Income (Loss)	$ (7)	$ (4)	$ (15)
Derivatives Designated as Hedging Instruments [Member] | Interest rate caps [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(4)
Derivatives Designated as Hedging Instruments [Member] | Interest rate caps [Member] | Interest Expense, Net [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized Income (Loss)
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense, Net [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized Income (Loss)			(9)
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense, Net [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized Income (Loss)	(3)	(4)	(4)
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Impact of Cross Currency Swaps [Member] | Selling, General and Administrative [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized Income (Loss)			14
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Selling, General and Administrative [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recognized Income (Loss)	$ (4)		$ (16)