Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - TripCo Outstanding Awards (Details)

v3.10.0.1
Stock-Based Compensation - TripCo Outstanding Awards (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 21, 2018
Stock-Based Compensation        
Allocated Share-based Compensation Expense $ 123,000,000 $ 103,000,000 $ 91,000,000  
TripAdvisor        
Stock-Based Compensation        
Allocated Share-based Compensation Expense 118,000,000      
2011 Plan | TripAdvisor        
Fair value assumptions        
Expected term   6 years 1 month 6 days 4 years 10 months 24 days  
Volatility rate (as a percent)   42.10% 41.80%  
2014 Plan        
Additional disclosures        
Unvested value not yet recognized $ 5,000,000      
Weighted average period the unrecognized compensation cost will be recognized 1 year      
Common Stock, Capital Shares Reserved for Future Issuance 2,400,000      
2018 Plan | TripAdvisor        
Stock-Based Compensation        
Number of shares available for grant 13,500,000     6,000,000
2011 and 2018 Plans | TripAdvisor        
Fair value assumptions        
Expected term 5 years 6 months      
Volatility rate (as a percent) 41.90%      
Additional disclosures        
Weighted average exercise price, grant date fair value (in dollars per share) $ 18.11      
Stock Options | 2014 Plan        
Stock-Based Compensation        
Maximum number of shares 6,700,000      
Fair value assumptions        
Volatility rate, minimum (as a percent) 40.60% 40.60% 40.60%  
Volatility rate, maximum (as a percent) 49.50% 49.50% 49.50%  
Dividend $ 0      
Additional disclosures        
Stock options exercised intrinsic value $ 117,000 $ 478,000 $ 1,200,000  
Stock Options | 2014 Plan | Series A        
Stock-Based Compensation        
Vesting period   1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options outstanding 681,000      
Granted 59,000 105,000 67,000  
Exercised (21,000)      
Cancelled or expired (149,000)      
Options outstanding 570,000 681,000    
Options exercisable 509,000      
WAEP        
Weighted average grant date fair value, options (in dollars per share) $ 8.83 $ 4.11 $ 6.63  
Weighted average exercise price, options outstanding (in dollars per share) 14.68      
Weighted average exercise price, options granted (in dollars per share) 19.51      
Weighted average exercise price, options exercised (in dollars per share) 12.67      
Weighted average exercise price, options forfeited/cancelled (in dollars per share) 14.13      
Weighted average exercise price, options outstanding (in dollars per share) 15.40 $ 14.68    
Weighted average exercise price, options exercisable (in dollars per share) $ 14.87      
Weighted average remaining contractual term outstanding 3 years 2 months 12 days      
Weighted average remaining contractual term exercisable 2 years 9 months 18 days      
Outstanding, aggregate intrinsic value $ 1,000,000      
Exercisable, aggregate intrinsic value $ 1,000,000      
Stock Options | 2014 Plan | Series B        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options outstanding 1,797,000      
Granted 0      
Exercised 0      
Cancelled or expired 0      
Options outstanding 1,797,000 1,797,000    
Options exercisable 899,000      
WAEP        
Weighted average exercise price, options outstanding (in dollars per share) $ 27.83      
Weighted average exercise price, options outstanding (in dollars per share) 27.83 $ 27.83    
Weighted average exercise price, options exercisable (in dollars per share) $ 27.83      
Weighted average remaining contractual term outstanding 6 years      
Weighted average remaining contractual term exercisable 6 years      
Stock Options | 2011 and 2018 Plans | TripAdvisor        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options outstanding 6,853,000      
Granted 762,000      
Exercised (1,162,000)      
Cancelled or expired (412,000)      
Options outstanding 6,041,000 6,853,000    
Options exercisable 3,217,000      
WAEP        
Weighted average exercise price, options outstanding (in dollars per share) $ 52.78      
Weighted average exercise price, options granted (in dollars per share) 43.53      
Weighted average exercise price, options exercised (in dollars per share) 37.26      
Weighted average exercise price, options forfeited/cancelled (in dollars per share) 61.46      
Weighted average exercise price, options outstanding (in dollars per share) 54.00 $ 52.78    
Weighted average exercise price, options exercisable (in dollars per share) $ 61.85      
Weighted average remaining contractual term outstanding 6 years 6 months      
Weighted average remaining contractual term exercisable 4 years 8 months 12 days      
Outstanding, aggregate intrinsic value $ 47,000,000      
Exercisable, aggregate intrinsic value $ 15,000,000      
Additional disclosures        
Weighted average period the unrecognized compensation cost will be recognized 2 years 9 months 18 days      
Unrecognized compensation cost, unvested options (in dollars) $ 37,000,000      
RSUs and MSUs | 2011 and 2018 Plans | TripAdvisor        
Additional disclosures        
Weighted average period the unrecognized compensation cost will be recognized 2 years 7 months 6 days      
Weighted average grant date fair value, granted during period RSUs and MSUs (in dollars per share) $ 43.38      
RSUs and MSUs granted (in shares) 3,000,000      
Unrecognized compensation cost, unvested RSUs and MSUs $ 225,000,000      
Unvested RSUs and MSUs (in shares) 7,000,000      
Employee Stock Option Excluding Assumed Options | 2011 and 2018 Plans | TripAdvisor        
Stock-Based Compensation        
Vesting period 4 years      
Term of awards 10 years      
Restricted Stock | 2014 Plan        
Additional disclosures        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 9,000 $ 13,000 $ 284,000  
Restricted Stock | 2014 Plan | Series A        
Additional disclosures        
Unvested RSUs and MSUs (in shares)   20,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 9.42    
Minimum | Stock Options | 2014 Plan        
Stock-Based Compensation        
Vesting period 1 year      
Term of awards 7 years      
Fair value assumptions        
Expected term 4 years 9 months 18 days 4 years 9 months 18 days 4 years 9 months 18 days  
Maximum | Stock Options | 2014 Plan        
Stock-Based Compensation        
Vesting period 5 years      
Term of awards 10 years      
Fair value assumptions        
Expected term 5 years 8 months 12 days 5 years 8 months 12 days 5 years 8 months 12 days