Summary of Hotel Revenues by Market Locations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation Of Revenue [Line Items]
Total revenues	$ 1,346	$ 1,348
New York
Disaggregation Of Revenue [Line Items]
Total revenues	161	150
San Diego
Disaggregation Of Revenue [Line Items]
Total revenues	133	137
San Francisco/San Jose
Disaggregation Of Revenue [Line Items]
Total revenues	107	104
Florida Gulf Coast
Disaggregation Of Revenue [Line Items]
Total revenues	98	87
Phoenix
Disaggregation Of Revenue [Line Items]
Total revenues	97	98
Maui/Oahu
Disaggregation Of Revenue [Line Items]
Total revenues	81	75
Washington, D.C. (Central Business District, "CBD")
Disaggregation Of Revenue [Line Items]
Total revenues	73	89
Orlando
Disaggregation Of Revenue [Line Items]
Total revenues	70	64
Boston
Disaggregation Of Revenue [Line Items]
Total revenues	54	54
Los Angeles
Disaggregation Of Revenue [Line Items]
Total revenues	47	38
Atlanta
Disaggregation Of Revenue [Line Items]
Total revenues	42	43
Northern Virginia
Disaggregation Of Revenue [Line Items]
Total revenues	36	44
Houston
Disaggregation Of Revenue [Line Items]
Total revenues	32	33
Chicago
Disaggregation Of Revenue [Line Items]
Total revenues	30	27
San Antonio
Disaggregation Of Revenue [Line Items]
Total revenues	30	33
Orange County
Disaggregation Of Revenue [Line Items]
Total revenues	29	31
New Orleans
Disaggregation Of Revenue [Line Items]
Total revenues	28	28
Seattle
Disaggregation Of Revenue [Line Items]
Total revenues	25	26
Jacksonville
Disaggregation Of Revenue [Line Items]
Total revenues	23	22
Miami
Disaggregation Of Revenue [Line Items]
Total revenues	19	18
Philadelphia
Disaggregation Of Revenue [Line Items]
Total revenues	19	17
Denver
Disaggregation Of Revenue [Line Items]
Total revenues	18	18
Other
Disaggregation Of Revenue [Line Items]
Total revenues	68	81
United States
Disaggregation Of Revenue [Line Items]
Total revenues	1,320	1,317
International
Disaggregation Of Revenue [Line Items]
Total revenues	$ 26	$ 31