Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Foreign currency forward sale contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a recurring basis, Assets	[1]	$ 24	$ 13
Interest rate swap derivatives
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a recurring basis, Liabilities	[1]	(2)	(2)
Significant Other Observable Inputs (Level 2) | Foreign currency forward sale contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a recurring basis, Assets	[1]	24	13
Significant Other Observable Inputs (Level 2) | Interest rate swap derivatives
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a recurring basis, Liabilities	[1]	$ (2)	(2)
Significant Unobservable Inputs (Level 3) | Impaired Hotel Properties Held And Used
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurements on a non-recurring basis, Impaired hotel properties held and used	[2]		$ 18

[1] These derivative contracts have been designated as hedging instruments.

[2] The fair value measurements are as of the measurement date of the impairment and may not reflect the book value as of December 31, 2014.