Summary of Hotel Revenues by Market Locations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenues	$ 1,262	$ 1,299	$ 4,135	$ 4,163
San Diego
Disaggregation Of Revenue [Line Items]
Revenues	138	136	409	402
San Francisco/San Jose
Disaggregation Of Revenue [Line Items]
Revenues	127	131	392	373
New York
Disaggregation Of Revenue [Line Items]
Revenues	134	172	384	539
Maui/Oahu
Disaggregation Of Revenue [Line Items]
Revenues	99	93	305	270
Washington, D.C. (Central Business District)
Disaggregation Of Revenue [Line Items]
Revenues	76	71	259	252
Florida Gulf Coast
Disaggregation Of Revenue [Line Items]
Revenues	51	37	256	216
Phoenix
Disaggregation Of Revenue [Line Items]
Revenues	45	46	236	220
Boston
Disaggregation Of Revenue [Line Items]
Revenues	86	86	234	231
Orlando
Disaggregation Of Revenue [Line Items]
Revenues	43	44	166	170
Los Angeles
Disaggregation Of Revenue [Line Items]
Revenues	49	48	141	143
Chicago
Disaggregation Of Revenue [Line Items]
Revenues	45	53	128	140
Miami
Disaggregation Of Revenue [Line Items]
Revenues	36	9	125	41
Atlanta
Disaggregation Of Revenue [Line Items]
Revenues	35	37	121	119
Northern Virginia
Disaggregation Of Revenue [Line Items]
Revenues	26	34	103	115
Seattle
Disaggregation Of Revenue [Line Items]
Revenues	35	38	92	99
Houston
Disaggregation Of Revenue [Line Items]
Revenues	25	25	86	88
Orange County
Disaggregation Of Revenue [Line Items]
Revenues	25	32	84	91
San Antonio
Disaggregation Of Revenue [Line Items]
Revenues	22	26	81	86
New Orleans
Disaggregation Of Revenue [Line Items]
Revenues	22	19	80	75
Jacksonville
Disaggregation Of Revenue [Line Items]
Revenues	21	25	79	78
Denver
Disaggregation Of Revenue [Line Items]
Revenues	27	26	72	69
Philadelphia
Disaggregation Of Revenue [Line Items]
Revenues	22	22	67	65
Other
Disaggregation Of Revenue [Line Items]
Revenues	50	61	170	196
United States
Disaggregation Of Revenue [Line Items]
Revenues	1,239	1,271	4,070	4,078
International
Disaggregation Of Revenue [Line Items]
Revenues	$ 23	$ 28	$ 65	$ 85