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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	$ 731	$ 733	$ 1,399	$ 1,417
Hotel Adjusted EBITDA	228	213	402	393
Depreciation and amortization expense	(69)	(73)	(139)	(143)
Corporate general and administrative	(15)	(16)	(31)	(30)
Other expenses	(18)	(15)	(35)	(28)
Gain on sales of assets, net	7		96
Interest income	1	1	2	1
Interest expense	(31)	(31)	(62)	(61)
Equity in earnings from investments in affiliates	8	8	12	12
Loss on foreign currency transactions	(4)	(4)	(3)	(3)
Income tax (expense) benefit	(13)	19	(13)	2,300
Other gain (loss), net	108	(1)	108	(1)
Other items	(1)	(2)	(4)	(4)
Net income	218	115	367	2,465
Total consolidated hotel revenue [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	714	717	1,365	1,388
Other [Member]
Reconciliation of Revenue and Adjusted EBITDA from Segments to Consolidated Amounts [Line Items]
Total revenues	$ 17	$ 16	$ 34	$ 29