Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
General and administrative	[1]	$ 43	$ 45	$ 94	$ 88
Operating Segments | Hotels, Media & Platform
Segment Reporting Information [Line Items]
General and administrative		16	17	34	31
Advertising expense		$ 1	$ 26	$ 5	$ 55

[1] Includes stock-based compensation expense as follows (Note 5):