Summary of Hotel Revenues by Market Locations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenues	$ 198	$ 1,262	$ 1,353	$ 4,135
San Diego
Disaggregation Of Revenue [Line Items]
Total revenues	16	138	108	409
San Francisco/San Jose
Disaggregation Of Revenue [Line Items]
Total revenues	12	127	124	392
New York
Disaggregation Of Revenue [Line Items]
Total revenues	9	134	102	384
Maui/Oahu
Disaggregation Of Revenue [Line Items]
Total revenues	4	99	98	305
Washington, D.C. (Central Business District)
Disaggregation Of Revenue [Line Items]
Total revenues	4	76	61	259
Florida Gulf Coast
Disaggregation Of Revenue [Line Items]
Total revenues	33	51	160	256
Phoenix
Disaggregation Of Revenue [Line Items]
Total revenues	17	45	108	236
Boston
Disaggregation Of Revenue [Line Items]
Total revenues	2	86	38	234
Orlando
Disaggregation Of Revenue [Line Items]
Total revenues	2	43	58	166
Los Angeles
Disaggregation Of Revenue [Line Items]
Total revenues	11	49	51	141
Chicago
Disaggregation Of Revenue [Line Items]
Total revenues	4	45	22	128
Miami
Disaggregation Of Revenue [Line Items]
Total revenues	12	36	77	125
Atlanta
Disaggregation Of Revenue [Line Items]
Total revenues	9	35	42	121
Northern Virginia
Disaggregation Of Revenue [Line Items]
Total revenues	5	26	27	103
Seattle
Disaggregation Of Revenue [Line Items]
Total revenues	2	35	20	92
Houston
Disaggregation Of Revenue [Line Items]
Total revenues	7	25	36	86
Orange County
Disaggregation Of Revenue [Line Items]
Total revenues	5	25	24	84
San Antonio
Disaggregation Of Revenue [Line Items]
Total revenues	3	22	21	81
New Orleans
Disaggregation Of Revenue [Line Items]
Total revenues	5	22	29	80
Jacksonville
Disaggregation Of Revenue [Line Items]
Total revenues	16	21	44	79
Denver
Disaggregation Of Revenue [Line Items]
Total revenues	4	27	21	72
Philadelphia
Disaggregation Of Revenue [Line Items]
Total revenues	6	22	20	67
Other
Disaggregation Of Revenue [Line Items]
Total revenues	8	50	44	170
United States
Disaggregation Of Revenue [Line Items]
Total revenues	196	1,239	1,335	4,070
International
Disaggregation Of Revenue [Line Items]
Total revenues	$ 2	$ 23	$ 18	$ 65