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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration