Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) $ in Millions	6 Months Ended
Jun. 30, 2021 USD ($)
Statement of Stockholders' Equity [Abstract]
Net of tax from purchase of capped calls	$ 9

Deferred tax asset recorded in connection with purchase of capped calls.

No definition available.

Name:	trip_NetOfTaxFromPurchaseOfCappedCalls
Namespace Prefix:	trip_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration