Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - TripAdvisor Awards (Details)

v3.19.3.a.u2
Stock-Based Compensation - TripAdvisor Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 21, 2018
Additional disclosures        
Stock-based compensation $ 131 $ 123 $ 103  
Tripadvisor        
Additional disclosures        
Stock-based compensation $ 124      
Tripadvisor | 2018 Plan        
Stock-Based Compensation        
Number of shares available for grant 10,100,000     6,000,000
Tripadvisor | 2018 Plan | RSUs and MSUs        
Additional disclosures        
Weighted average period the unrecognized compensation cost will be recognized 2 years 6 months      
RSUs and MSUs granted (in shares) 5,000,000      
Weighted average grant date fair value, RSUs (in dollars per share) $ 47.61      
Unvested RSUs and MSUs (in shares) 9,000,000      
Unrecognized compensation cost, unvested RSUs and MSUs $ 248      
Tripadvisor | 2011 and 2018 Plans        
Stock-Based Compensation        
Volatility rate (as a percent) 42.10% 41.90% 42.10%  
Expected term 5 years 2 months 12 days 5 years 6 months 6 years 1 month 6 days  
Tripadvisor | 2011 and 2018 Plans | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding beginning balance 6,041,000      
Granted 752,000      
Exercised (195,000)      
Cancelled or expired (581,000)      
Outstanding ending balance 6,017,000 6,041,000    
Options exercisable 3,425,000      
WAEP        
Weighted average exercise price, options outstanding (in dollars per share) $ 54.00      
Weighted average exercise price, options granted (in dollars per share) 48.30      
Weighted average exercise price, options exercised (in dollars per share) 42.17      
Weighted average exercise price, options forfeited/cancelled (in dollars per share) 56.97      
Weighted average exercise price, options outstanding (in dollars per share) 50.27 $ 54.00    
Weighted average exercise price, options exercisable (in dollars per share) $ 57.27      
Weighted average remaining contractual term outstanding 5 years 10 months 24 days      
Weighted average remaining contractual term exercisable 4 years 2 months 12 days      
Additional disclosures        
Weighted average grant date fair value, options (in dollars per share) $ 21.25      
Term of awards 10 years      
Vesting period 4 years      
Unrecognized compensation cost, unvested options (in dollars) $ 32      
Weighted average period the unrecognized compensation cost will be recognized 2 years 7 months 6 days