Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2011 Segment	Dec. 31, 2012	Oct. 31, 2012	Dec. 31, 2012 Management and franchise agreements [Member]	Dec. 31, 2011 Management and franchise agreements [Member]	Dec. 31, 2010 Management and franchise agreements [Member]
Property, Plant and Equipment [Line Items]
Goodwill held for sale		$ 4
Sensitivity analysis discount rate			10.00%
Capitalization rate in terminal period			2.00%
Number of reporting units	2
Finite-lived Intangible assets amortization expense				$ 24	$ 29	$ 33