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

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