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
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	$ 668	$ 684
Hotel Adjusted EBITDA	174	180
Depreciation and amortization expense	(70)	(70)
Corporate general and administrative	(16)	(14)
Other expenses	(17)	(13)
Gain on sales of assets, net	89
Interest income	1
Interest expense	(31)	(30)
Equity in earnings from investments in affiliates	4	4
Gain on foreign currency transactions	1	1
Income tax benefit	0	2,281
Other items	(3)	(2)
Net income	149	2,350
Total consolidated hotel revenue [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	651	671
Other [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	$ 17	$ 13