Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)

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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment, at cost   $ 234 $ 226
Other long term liabilities   $ 283 $ 323
TripAdvisor | ASU 2016-02 | Forecast      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property and equipment, at cost $ (62)    
Other long term liabilities (70)    
TripAdvisor | ASU 2016-02 | Forecast | Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
ROU assets 70    
Operating Lease, Liability 85    
Finance lease, ROU asset 105    
Finance lease liability 85    
TripAdvisor | ASU 2016-02 | Forecast | Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
ROU assets 80    
Operating Lease, Liability 95    
Finance lease, ROU asset 120    
Finance lease liability $ 95