Fair Value of Financial Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Fair Value Measurements on a Recurring Basis | Interest rate swap derivatives
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative assets	$ 4	[1]	$ 7	[1]
Derivative liabilities	(4)	[1]	(6)	[1]
Fair Value Measurements on a Recurring Basis | Forward currency sale contracts
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative assets	7	[1]	5	[1]
Fair Value, Measurements, Nonrecurring | Impaired Hotel Properties Held and Used
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impaired hotel properties held and used			34	[2]
Significant Other Observable Inputs (Level 2) | Fair Value Measurements on a Recurring Basis | Interest rate swap derivatives
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative assets	4	[1]	7	[1]
Derivative liabilities	(4)	[1]	(6)	[1]
Significant Other Observable Inputs (Level 2) | Fair Value Measurements on a Recurring Basis | Forward currency sale contracts
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative assets	7	[1]	5	[1]
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Impaired Hotel Properties Held and Used
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impaired hotel properties held and used			$ 34	[2]

[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, 2012.