Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
General and administrative	[1]	$ 38	$ 34	$ 73	$ 72
Operating Segments | Hotel Segment
Segment Reporting Information [Line Items]
General and administrative		20	19	38	41
Operating Segments | Non-Hotel Segment
Segment Reporting Information [Line Items]
General and administrative		$ 10	$ 9	$ 19	$ 18

[1] Includes stock-based compensation expense as follows: