Financial Instruments - Summary of Fair Value of Company's Derivative Contracts (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Fair Value Asset	$ 5	$ 11
Fair Value (Liability)		(1)
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Caps [Member] | Other Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value (Liability)
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Caps [Member] | Other Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset		8
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Caps [Member] | Accrued Expenses and Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value (Liability)
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Caps [Member] | Other Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset	4
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Accrued Expenses and Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value (Liability)		(1)
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset	$ 1	$ 3