Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
General and administrative	[1]	$ 38	$ 37	$ 110	$ 114
Operating Segments | Hotel Segment
Segment Reporting Information [Line Items]
General and administrative		21	23	63	69
Operating Segments | Non-Hotel Segment
Segment Reporting Information [Line Items]
General and administrative		$ 10	$ 8	$ 28	$ 23

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