Income Taxes - Reconciliation of the Provision for Income Taxes (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Local income tax on intercompany transaction	$ 7	$ 10
Australia Tax \| Intangible Property Rights
Income Taxes [Line Items]
Local income tax on intercompany transaction		$ 10

Income tax rate reconciliation local income tax on intercompany transaction.

No definition available.

Name:	trip_IncomeTaxRateReconciliationLocalIncomeTaxOnIntercompanyTransaction
Namespace Prefix:	trip_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration