Asset Dispositions and Impairments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Management agreement Hotel	Sep. 30, 2013 Franchise Agreements Hotel	Sep. 30, 2013 Non Core Assets	Sep. 30, 2013 Four wholly-owned hotels Hotel	Sep. 30, 2012 Two wholly-owned hotels Hotel	Sep. 30, 2012 Wholly-owned hotel one Hotel
Asset Dispositions And Impairments [Line Items]
Gain (loss) on sale of assets			$ (8)		$ 4			$ (7)
Net cash proceeds from disposal of assets	139	279			12	126	244	11
Number of wholly-owned hotels sold			1	2		4	2	1
Term of agreements			20 years	20 years			20 years	20 years
Deferred gains on dispositions of assets			$ 3				$ 100