Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014 Assets Contract	Sep. 30, 2014 Impaired Hotel Properties Held And Used	Dec. 31, 2013 Impaired Hotel Properties Held And Used	Sep. 30, 2014 Impaired Hotel Properties Held And Used Significant Unobservable Inputs (Level 3)	Dec. 31, 2013 Impaired Hotel Properties Held And Used Significant Unobservable Inputs (Level 3)
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Number of foreign currency forward contracts outstanding	4
Impairment loss	$ 6
Fair value measurements on a non-recurring basis, Impaired hotel properties held and used		$ 18	$ 9	$ 18	$ 9
Number of properties impaired	1