Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
General and administrative expenses	[1]	$ 34	$ 44	$ 72	$ 77
Operating Segments | Hotel Segment
Segment Reporting Information [Line Items]
General and administrative expenses		19	26	41	46
Operating Segments | Non-Hotel Segment
Segment Reporting Information [Line Items]
General and administrative expenses		$ 9	$ 9	$ 18	$ 15

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