Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
location
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Operating leases      
Capitalization of construction-in-process costs     $ 6
Rental expense $ 19 $ 21 $ 22
Estimated future minimum rental payments      
2018 28    
2019 27    
2020 26    
2021 25    
2022 26    
Thereafter 96    
Total $ 228    
Trip Advisor | Other leased locations      
Operating leases      
Leased area (in square feet) | ft² 450,000    
Number of locations | location 40