Segment Information - Summary of Segment Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue		$ 378	$ 372
Adjusted EBITDA	[1]	80	73
Depreciation		(20)	(19)
Amortization of intangible assets		(8)	(8)
Stock-based compensation		(29)	(19)
Operating income		23	27
Other expense, net		(2)	(2)
Income before income taxes		21	25
Provision for income taxes		(16)	(12)
Net income		5	13
Operating Segments | Hotel Segment
Segment Reporting Information [Line Items]
Revenue		299	314
Adjusted EBITDA	[1]	88	88
Operating Segments | Non-Hotel Segment
Segment Reporting Information [Line Items]
Revenue		79	58
Adjusted EBITDA	[1]	(8)	(15)
Corporate and Unallocated
Segment Reporting Information [Line Items]
Depreciation		(20)	(19)
Amortization of intangible assets		(8)	(8)
Stock-based compensation		$ (29)	$ (19)

[1] Includes allocated general and administrative expenses in our Hotel segment of $20 million and $19 million; and in our Non-Hotel segment of $12 million and $9 million for the three months ended March 31, 2018 and 2017, respectively.