XML 78 R56.htm IDEA: XBRL DOCUMENT v3.21.1
Segment Information - Summary of Segment Information (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
General and administrative [1] $ 38 $ 51
Reportable Segments | Hotels, Media & Platform    
Segment Reporting Information [Line Items]    
General and administrative 16 18
Advertising expense $ 1 $ 4
[1] Includes stock-based compensation expense as follows (Note 8):