Financial Instruments - Impact of Changes in Fair Values of Derivatives (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Instruments, Amount of Gain (Loss) Recorded into Net Income (Loss)	$ 2	$ (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)	(1)
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) Recorded into Net Income (Loss)
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) Recorded into Net Income (Loss)		(1)
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) Recorded into Net Income (Loss)	$ 2	$ (14)