Revenue - Schedule of Revenue Components (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue [Line Items]
Total revenues	$ 219	$ 233	$ 427	$ 429
Operating Lease Revenues Rooms [Member]
Revenue [Line Items]
Total revenues	215	$ 228	419	$ 420
Operating Lease Revenues Other [Member}
Revenue [Line Items]
Total revenues	2		3
Operating Lease Revenues [Member]
Revenue [Line Items]
Total revenues	217		422
Customer Revenues [Member]
Revenue [Line Items]
Total revenues	$ 2		$ 5