Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details)

v3.8.0.1
Stock Based Compensation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Additional disclosures      
Stock-based compensation $ 103,000,000 $ 91,000,000 $ 82,000,000
Trip Advisor      
Additional disclosures      
Stock-based compensation $ 96,000,000    
2011 Plan | Series B      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Exercised 0    
2011 Plan | Trip Advisor      
Stock-Based Compensation      
Number of shares available for grant 9,400,000    
Fair value assumptions      
Expected term 6 years 1 month 6 days 4 years 10 months 24 days 5 years 4 months 24 days
Volatility rate (as a percent) 42.10% 41.80% 41.80%
2014 Plan      
Additional disclosures      
Unvested value not yet recognized $ 10,000,000    
Weighted average period the unrecognized compensation cost will be recognized 1 year 6 months    
Common Stock, Capital Shares Reserved for Future Issuance 2,500,000    
2014 Plan | Series B      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Cancelled or expired 0    
Restricted Stock Units (RSUs) | 2011 Plan | Trip Advisor      
Additional disclosures      
Weighted average period the unrecognized compensation cost will be recognized 3 years    
RSUs granted (in shares) 5,000,000    
Weighted average grant date fair value, granted during period RSUs (in dollars per share) $ 41.09    
Unrecognized compensation cost, unvested RSUs $ 222,000,000    
Unvested weighted average grant date fair value (in dollars per share) $ 48.14    
Unvested RSUs (in shares) 6,000,000    
Stock Options | 2011 Plan | Trip Advisor      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding 5,818,000    
Granted 2,333,000    
Exercised (496,000)    
Cancelled or expired (802,000)    
Options outstanding 6,853,000 5,818,000  
Options exercisable 3,340,000    
WAEP      
Weighted average exercise price, options outstanding (in dollars per share) $ 57.60    
Weighted average exercise price, options granted (in dollars per share) 40.03    
Weighted average exercise price, options exercised (in dollars per share) 29.37    
Weighted average exercise price, options forfeited/cancelled (in dollars per share) 65.13    
Weighted average exercise price, options outstanding (in dollars per share) 52.78 $ 57.60  
Weighted average exercise price, options exercisable (in dollars per share) $ 52.69    
Weighted average remaining contractual term outstanding 6 years 6 months    
Weighted average remaining contractual term exercisable 4 years 4 months 24 days    
Outstanding, aggregate intrinsic value $ 3,000,000    
Exercisable, aggregate intrinsic value $ 3,000,000    
Additional disclosures      
Weighted average period the unrecognized compensation cost will be recognized 2 years 10 months 24 days    
Unrecognized compensation cost, unvested options (in dollars) $ 52,000,000    
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%  
Volatility rate, maximum (as a percent) 49.10% 49.10%  
Dividend $ 0    
Additional disclosures      
Stock options exercised intrinsic value $ 478,000 $ 1,200,000 $ 7,300,000
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 661,000    
Granted 105,000 67,000 25,000
Exercised (82,000)    
Cancelled or expired (3,000)    
Options outstanding 681,000 661,000  
Options exercisable 570,000    
WAEP      
Weighted average exercise price, options outstanding (in dollars per share) $ 14.99    
Weighted average exercise price, options granted (in dollars per share) 9.40    
Weighted average exercise price, options exercised (in dollars per share) 10.25    
Weighted average exercise price, options forfeited/cancelled (in dollars per share) 20.45    
Weighted average exercise price, options outstanding (in dollars per share) 14.68 $ 14.99  
Weighted average exercise price, options exercisable (in dollars per share) $ 15.56    
Weighted average remaining contractual term outstanding 2 years 9 months 18 days    
Weighted average remaining contractual term exercisable 2 years 1 month 6 days    
Additional disclosures      
Weighted average grant date fair value, options (in dollars per share) $ 4.11 $ 6.63 $ 12.66
Stock Options | 2014 Plan | Series B      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted 0    
Employee Stock Option Excluding Assumed Options | 2011 Plan | Trip Advisor      
Stock-Based Compensation      
Vesting period 4 years    
Term of awards 10 years    
WAEP      
Weighted average exercise price, grant date fair value (in dollars per share) $ 40.03    
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 $ 13,000 $ 284,000 $ 797,000
Restricted Stock | 2014 Plan | Series A      
Additional disclosures      
Unvested RSUs (in shares) 14,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 4.98    
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  
Maximum | Stock Options | 2014 Plan      
Stock-Based Compensation      
Vesting period 5 years    
Term of awards 10 years    
Fair value assumptions      
Expected term 5 years 10 months 24 days 5 years 10 months 24 days