Revenue Recognition - Reconciliation of Disaggregated Revenue to Segment Revenue (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total Revenue		$ 335	$ 428	$ 422	$ 376	$ 346	$ 458	$ 433	$ 378	$ 1,560	[1]	$ 1,615	[1]	$ 1,556
Hotels, Media & Platform
Disaggregation Of Revenue [Line Items]
Total Revenue	[1]									939		1,001
Experiences & Dining Segment
Disaggregation Of Revenue [Line Items]
Total Revenue	[1]									456		372
Other
Disaggregation Of Revenue [Line Items]
Total Revenue	[1],[2]									165		242
Tripadvisor-Branded Hotels | Hotels, Media & Platform
Disaggregation Of Revenue [Line Items]
Total Revenue	[1]									779		848
Tripadvisor-Branded Display and Platform | Hotels, Media & Platform
Disaggregation Of Revenue [Line Items]
Total Revenue	[1]									$ 160		$ 153

[1] Our revenue is recognized primarily at a point in time for all reported segments

[2] Other consists of the combination of our Rentals, Flights/Cruises/Car, SmarterTravel and Tripadvisor China business units and does not constitute a reportable segment