Business Segment Information - Reconciliation of Revenues from Consolidated Hotels to Condensed Combined Consolidated Amounts and Hotel Adjusted EBITDA to Net Income (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	$ 652			$ 688			$ 2,051	$ 2,105
Hotel Adjusted EBITDA	171			183			573	576
Casualty gain (loss) and impairment loss, net	1			(2)			1	(2)
Depreciation and amortization expense	(69)			(74)			(208)	(217)
Corporate general and administrative expense	(16)			(15)			(47)	(45)
Other expenses	(19)			(18)			(54)	(46)
Gain on sales of assets, net	2						98
Interest income	2			1			4	2
Interest expense	(32)			(32)			(94)	(93)
Equity in earnings from investments in affiliates	4			6			16	18
Loss on foreign currency transactions	(1)			(1)			(4)	(4)
Income tax benefit (expense)				44			(13)	2,344
Other (loss) gain, net	(2)			(2)			106	(3)
Other items	(5)			(3)			(9)	(7)
Net income	55	$ 218	$ 149	105	$ 115	$ 2,350	422	2,570
Total consolidated hotel revenue [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	633			670			1,998	2,058
Other [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	$ 19			$ 18			$ 53	$ 47