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Stock-Based Compensation - TripCo Incentive Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation $ 30 $ 27
Operating expense    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation 12 11
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation $ 18 16
2019 Plan    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Dividend rate 0.00%  
Tripadvisor    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation $ 29 $ 26