Condensed Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) $ in Millions	3 Months Ended
Mar. 31, 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