Financial Instruments and Fair Value Measurements - Net Notional Principal Amounts of Outstanding Derivative Instruments (Parenthetical) (Details)	12 Months Ended
Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Maximum maturity period of outstanding derivatives are not designated as hedging instruments	90 days

Outstanding derivatives not designated as hedging instruments maximum maturity period.

No definition available.

Name:	trip_OutstandingDerivativesNotDesignatedAsHedgingInstrumentsMaximumMaturityPeriod
Namespace Prefix:	trip_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration