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Segment Information - Revenue by Business Model and Service Type (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Revenue $ 3,619 $ 2,962 $ 9,049 $ 6,319
Lodging        
Segment Reporting Information [Line Items]        
Revenue 2,881 2,300 6,891 4,736
Air        
Segment Reporting Information [Line Items]        
Revenue 100 61 269 189
Advertising and media        
Segment Reporting Information [Line Items]        
Revenue 222 202 601 451
Other        
Segment Reporting Information [Line Items]        
Revenue 416 399 1,288 943
Merchant | Sales Channel, Through Intermediary        
Segment Reporting Information [Line Items]        
Revenue 2,427 1,923 6,037 4,057
Agency | Sales Channel, Through Intermediary        
Segment Reporting Information [Line Items]        
Revenue 935 800 2,309 1,696
Advertising, media and other | Sales Channel, Through Intermediary        
Segment Reporting Information [Line Items]        
Revenue $ 257 $ 239 $ 703 $ 566