Revenue - Schedule of Revenue Components (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue [Line Items]
Total revenues	$ 208	$ 196
Operating Lease Revenues Rooms [Member]
Revenue [Line Items]
Total revenues	204	$ 192
Operating Lease Revenues Other [Member}
Revenue [Line Items]
Total revenues	1
Operating Lease Revenues [Member]
Revenue [Line Items]
Total revenues	205
Customer Revenues [Member]
Revenue [Line Items]
Total revenues	$ 3