Revenue Recognition - Reconciliation of Disaggregated Revenue to Segment Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Total Revenue		$ 1,615		$ 1,556	$ 1,480
Hotel Segment
Disaggregation Of Revenue [Line Items]
Total Revenue	[1]	1,157
Non-Hotel Segment
Disaggregation Of Revenue [Line Items]
Total Revenue		458	[1]	360	290
TripAdvisor-Branded Click-Based and Transaction Revenue | Hotel Segment
Disaggregation Of Revenue [Line Items]
Total Revenue		722		756	750
TripAdvisor-Branded Display-Based Advertising and Subscription Revenue | Hotel Segment
Disaggregation Of Revenue [Line Items]
Total Revenue		308		292	282
Other Hotel Revenue | Hotel Segment
Disaggregation Of Revenue [Line Items]
Total Revenue		$ 127		$ 148	$ 158

[1] Our revenue is recognized primarily at a point in time for both our Hotel and Non-Hotel segments.