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Accrued Expenses and Other Current Liabilities - Details of Accrued Expenses and Other Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accrued salary, bonus, and related benefits $ 41us-gaap_EmployeeRelatedLiabilitiesCurrent $ 35us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued marketing costs 24us-gaap_AccruedMarketingCostsCurrent 22us-gaap_AccruedMarketingCostsCurrent
Accrued charitable foundation payments 9trip_AccruedCharitableFoundationPaymentsCurrent [1] 7trip_AccruedCharitableFoundationPaymentsCurrent [1]
Other 40us-gaap_OtherAccruedLiabilitiesCurrent 22us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses and other current liabilities $ 114us-gaap_AccruedLiabilitiesCurrent $ 86us-gaap_AccruedLiabilitiesCurrent
[1] See “Note 12— Commitments and Contingencies” for information regarding our charitable foundation.