Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.8.0.1
Summary of Significant Accounting Policies (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
item
shares
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
USD ($)
item
shares
Period accounts receivable are generally due 30 days    
Allowance for doubtful accounts $ 16 $ 9  
Maximum invested cash maturity period 18 months    
Maximum security maturity period 3 years    
Total property and equipment $ 226 225  
Foreign currency exchange gain (loss) 1 (4) $ (3)
Advertising expense 629 544 519
Stock-based compensation 103 91 $ 82
Trade and other receivables, net $ 230 $ 191  
Earnings (Loss) Per Common Share (EPS)      
Basic WASO (In Shares) | shares 75 75 75
Diluted WASO (In Shares) | shares 75 75 75
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 2 2  
Operating expense      
Stock-based compensation $ 40 $ 40 $ 32
Selling, general and administrative      
Stock-based compensation 63 51 $ 50
Maximum      
Earnings (Loss) Per Common Share (EPS)      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     1
Buildings      
Total property and equipment 122 123  
Leasehold improvements      
Total property and equipment 39 39  
Computer equipment      
Total property and equipment 46 39  
Furniture, office equipment and other      
Total property and equipment $ 19 24  
Furniture, office equipment and other | Minimum      
Property estimated useful life 3 years    
Furniture, office equipment and other | Maximum      
Property estimated useful life 5 years    
Trip Advisor      
Stock-based compensation $ 96    
Capitalized Stock Based Compensation $ 13 $ 12 $ 8
Number of most significant travel partners | item 2 2 2
Deferred merchant payable $ 156 $ 128  
Trip Advisor | Revenue | Customer | Expedia and Priceline      
Customer concentration (as a percent) 43.00% 46.00% 46.00%
Trip Advisor | Buildings      
Property estimated useful life 40 years