Employee Benefit Plans - Multi-Employer Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Total Contributions	$ 8	$ 8	$ 9
New York Hotel Trades Council and Hotel Association of New York City, Inc. Pension Fund [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
EIN/ Pension Plan Number	13-1764242/001
Pension Protection Act Zone Status	Yellow	Yellow
Total Contributions	4	4	4
Other Funds [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
EIN/ Pension Plan Number	Various
Total Contributions	$ 4	$ 4	$ 5