Asset Dispositions and Impairments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Three wholly-owned hotels [Member] Hotel	Jun. 30, 2013 Wholly-owned hotel one [Member] Hotel	Jun. 30, 2012 Wholly-owned hotel one [Member] Hotel
Impaired Long-Lived Assets Held and Used [Line Items]
Net cash proceeds from disposal of wholly-owned hotel	$ 127	$ 31	$ 61	$ 65	$ 11
Number of wholly-owned hotels sold			3	1	1
Term of agreements			20 years	20 years	20 years
Pre-tax gain (loss) on sales of wholly-owned hotel			$ (8)	$ 3	$ (7)