Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Contract Balances (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accounts receivable $ 205   $ 230
Contract assets 7    
Total 212   $ 230
TripAdvisor      
Deferred revenue   $ 59  
Contract with customer revenue recognized 57    
Reversal of revenue recognized due to cancellation by travelers $ 2