Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
General and administrative expenses	[1]	$ 37	$ 33
Operating Segments | Hotel Segment
Segment Reporting Information [Line Items]
General and administrative expenses		22	20
Operating Segments | Non-Hotel Segment
Segment Reporting Information [Line Items]
General and administrative expenses		$ 9	$ 6

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