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Income Taxes - Summary of Deferred Tax Assets and Deferred Tax Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Stock-based compensation $ 43us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost $ 30us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards 34us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 18us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Provision for accrued expenses 13us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred rent 5us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent  
Build-to-suit lease 26trip_DeferredTaxAssetBuildToSuitLease  
Foreign advertising spend 9trip_DeferredTaxAssetsForeignAdvertisingSpend  
Other 5us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 4us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Total deferred tax assets 135us-gaap_DeferredTaxAssetsGross 59us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (19)us-gaap_DeferredTaxAssetsValuationAllowance (13)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 116us-gaap_DeferredTaxAssetsNet 46us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Intangible assets (88)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (32)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Property and equipment (25)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (18)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid expenses (4)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (2)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Lease financing obligation (26)us-gaap_DeferredTaxLiabilitiesLeasingArrangements  
Other (1)us-gaap_DeferredTaxLiabilitiesOther (2)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (144)us-gaap_DeferredIncomeTaxLiabilities (54)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability $ (28)us-gaap_DeferredTaxLiabilities $ (8)us-gaap_DeferredTaxLiabilities