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Stock-Based Compensation - Expedia (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Additional disclosures        
Expected dividend yield       0.00%
Share-based Compensation   $ (25) $ 1 $ 92
Expedia        
Additional disclosures        
Share-based Compensation   $ (25)   $ 95
Expedia | RSUs        
Number of shares        
Granted (in shares)       1
Outstanding at the end of the period (in shares) 2 2   2
Expedia | Stock Options        
Number of shares        
Granted (in shares)       3
Outstanding at the end of the period (in shares) 16 16   16
Share Based Compensation Arrangement By Share Based Payment Award Outstanding Number 19 19   19
Weighted average exercise price        
Outstanding at the end of the period (in dollars per share) $ 93.89 $ 93.89   $ 93.89
Additional disclosures        
Outstanding Weighted Average Remaining contractual term 4 years 7 months 6 days      
Expedia | Stock Options | CEO        
Additional disclosures        
Share-based Compensation   $ (88)    
Expedia | Stock Options | Minimum        
Additional disclosures        
Vesting Period       4 years