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Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
General and administrative [1] $ 35 $ 51 $ 129 $ 138
Operating Segments | Hotels, Media & Platform        
Segment Reporting Information [Line Items]        
General and administrative 14 20 48 51
Advertising expense $ 3 $ 18 $ 8 $ 73
[1] Includes stock-based compensation expense as follows (Note 5):