BKNG


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:Revenues
us-gaap:ProductOrService
us-gaap:StatementGeographical

us-gaap:OperatingExpenses

us-gaap:GeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss

us-gaap:InterestExpense
us-gaap:DebtInstrument
us-gaap:InterestExpenseDebt

us-gaap:NonoperatingIncomeExpense

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
us-gaap:StatementEquityComponents

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:LongTermInvestments
us-gaap:InvestmentType

us-gaap:Goodwill
us-gaap:ReportingUnit

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent
us-gaap:BalanceSheetLocation, bkng:ContractLiabilityType
us-gaap:ContractWithCustomerLiabilityCurrent
us-gaap:BalanceSheetLocation, bkng:ContractLiabilityType, bkng:CustomerIncentiveProgram

us-gaap:LongTermDebt
us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:StockholdersEquity
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

bkng:AccountsReceivableCreditLossExpenseReversalAndChargebacks
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
bkng:AdditionalPaymentToDebtHolderSettledInSharesAggregateValueOfShares
us-gaap:DebtInstrument
bkng:DebtInstrumentCouponInterestExpense
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
bkng:EquitySecuritiesFVNICostOfSecuritiesSold
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bkng:ForeignCurrencyTransactionGainLossbeforetaxassociatedwiththeremeasurementofnonfunctionalcurrencydebt

bkng:ForeignCurrencyTransactionsAndOther

bkng:Noncashleaseexpense
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject, dei:LegalEntity
bkng:PaymentOfContractualObligation
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
bkng:PercentageOnConversionPriceOfClosingPriceOfCommonStockTradedForAtLeast20TradingDaysOutOf30ConsecutiveTradingDaysInPeriodOnLastTradingDayOfPreviousQuarter
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
bkng:ProceedsfromSaleofEquitySecuritiesFVNI
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bkng:ReclassificationAdjustmentForConvertibleDebtInMezzanine
us-gaap:StatementEquityComponents
us-gaap:Range, us-gaap:ReportingUnit
bkng:ReportingUnitEstimatedImpactOnFairValueAssessment

bkng:Salesandotherexpenses

bkng:ShareBasedCompensationAndOtherStockBasedExpense
us-gaap:AwardType
bkng:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType, bkng:Typeofstockbasedcompensation

us-gaap:AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs
us-gaap:DebtInstrument
us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfIntangibleAssets

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CommunicationsAndInformationTechnology
us-gaap:ProductOrService, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateDuringPeriod

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAndAmortization

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
us-gaap:IncomeTaxAuthority

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments

us-gaap:GoodwillImpairmentLoss
us-gaap:ReportingUnit

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInOperatingLiabilities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestPaidNet

us-gaap:InvestmentIncomeNet

us-gaap:LaborAndRelatedExpense

us-gaap:MarketingExpense
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:HedgingDesignation
us-gaap:NotionalAmountOfNonderivativeInstruments
us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherNoncashExpense

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProceedsFromShortTermDebt

us-gaap:ProvisionForDoubtfulAccounts
bkng:ComponentofProvisionchargedtoearnings
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:RepaymentsOfShortTermDebt
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents

bkng:ConvertibleDebtEquity

bkng:ConvertibleDebtLiability

bkng:DeferredMerchantBookings
us-gaap:FinancialInstrument, us-gaap:InvestmentType
bkng:EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
bkng:EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:MeasurementInputType
bkng:Fairvaluemeasurementinputsnumber
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:MeasurementInputType
us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:MeasurementInputType
bkng:Fairvaluemeasurementinputspercentages
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:ValuationTechnique
bkng:Fairvaluemeasurementinputsvaluationapproachallocation
us-gaap:InvestmentType
bkng:Longterminvestmentcost
us-gaap:InvestmentType
bkng:Longterminvestmentgrossunrealizedgain
us-gaap:InvestmentType
bkng:Longterminvestmentgrossunrealizedloss
us-gaap:InvestmentType
bkng:MarketableSecuritiesCost
us-gaap:InvestmentType
bkng:MarketableSecuritiesGrossUnrealizedGain
us-gaap:InvestmentType
bkng:MarketableSecuritiesGrossUnrealizedLosses

bkng:PrepaidExpenseAllowanceForCreditLoss
us-gaap:BalanceSheetLocation

us-gaap:AccountsAndOtherReceivablesNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:StatementEquityComponents
us-gaap:AociBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:AociTaxAttributableToParent
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:BalanceSheetLocation
us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject, dei:LegalEntity
us-gaap:ContractualObligation
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject, us-gaap:LeaseArrangementType, dei:LegalEntity
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject, us-gaap:SubsequentEventType, dei:LegalEntity

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentConvertibleConversionPrice1
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentFaceAmount
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrumentFairValue

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, bkng:NotionalAmountType
us-gaap:DerivativeNotionalAmount
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:EquitySecuritiesFvNi
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:EquitySecuritiesFvNiCost
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingencyAccrualAtCarryingValue

us-gaap:MarketableSecuritiesCurrent
us-gaap:InvestmentType
us-gaap:BalanceSheetLocation
us-gaap:PrepaidExpenseCurrentAndNoncurrent
us-gaap:AwardDate, us-gaap:AwardType, us-gaap:ContingentConsiderationByType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:ShortTermBorrowings
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent

us-gaap:TreasuryStockShares

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ▁▁▁▁▁▁██████████████████████▇▇▇▇▇▇▇▇▇▇▇0.00.00.00.00.00.0489000.0489000.0488000.0487000.0486000.0486000.0486000.0485000.0484000.0484000.0484000.0482000.0482000.0482000.0481000.0480000.0480000.0480000.0478000.0476000.0468000.0467000.0452000.0450000.0450000.0450000.0449000.0446000.0446000.0446000.0446000.0445000.0438000.0NANANA405000.0NANANA
us-gaap:CommonStockSharesIssued █████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▅▅▃▃▃▃▂▂▂▂▂▂▁636363636362626262626262626262626262626161616161616160605858585857575757575756NANANA52NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock█████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▄▄▂▂▂▂▁▁▁▁636363636362626262626262626262626262626161616161616160605858585857575757NANA56NANANA52NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 41NA424345NA474849NA495050NA495050NA515252NA535253NA525251NA515151NA51515151NA505050NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 41NA424345NA474848NA484949NA494949NA505151NA525252NA515049NA494949NA49494949NA484746NANANANA
us-gaap:EarningsPerShareBasic ▁▆█▅▅▄▇▅▄▂▇▅▄▄▄▄▄▄▆▄▄▄▅▄▄▄▅▄▃▄▄▄▃▃▄▄▃▃▃▃▃▃▃▄▃▃-17.0128.0746.0122.6217.0114.037.3920.3412.56-11.4135.1214.669.2613.6610.2411.717.5410.1423.6710.026.428.6520.2711.06.357.3216.228.624.895.7911.977.073.654.539.439.435.162.122.764.592.411.161.777.491.610.61
us-gaap:EarningsPerShareDiluted ▁▆█▅▅▄▇▅▄▂▇▅▄▄▄▄▄▄▆▄▄▄▅▄▄▄▅▄▃▄▄▄▃▃▄▄▃▃▃▃▃▃▃▄▃▃-17.0127.7545.5422.4416.8513.8637.0220.1312.34-11.4134.4314.399.1113.4710.1311.67.4710.023.419.946.368.5620.0310.896.257.1415.728.394.765.6311.666.883.544.419.179.175.022.052.664.412.261.061.556.421.380.53
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▄▅█▆▅▅█▆▅▅▇▅▄▄▆▄▄▃▅▄▃▃▅▄▃▃▄▃▂▂▃▂▂▂▃▃▂▂▁▂▁▁▁▁▁▁2288333950403850283732134849353729282803443430242419234836902555214819993102228018401840283621231641154122691680130211901706132610379901452145211028097311001767584541730603462
us-gaap:Revenues ▄▅█▆▅▅█▆▅▅▇▅▄▄▆▄▄▃▅▄▃▃▅▄▃▃▄▃▂▂▃▂▂▂▃▃▂▂▁▂▁▁▁▁▁▁2288333950403850283732134849353729282803443430242419234836902555214819993102228018401840283621231641154122691680130211901706132610379901452145211028097311001767584541730603462
 us-gaap:Revenues us-gaap:ProductOrService bkng:AgencyRevenue1424NANANA1949NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ProductOrService bkng:MerchantRevenue659NANANA603NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementGeographical bkng:OtherGeographicalAreas326NANANA399NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementGeographical country:NL1677NANANA2072NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementGeographical country:US285NANANA366NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingExpenses ▇▆█▇▆▅▇▆▆▄▆▅▄▃█▄▃▂▃▃▂▂▂▂▁259721672670260322812069260223152197178322722058177714862755169714691221145814141238109512971149967NA942829699NA640545501NA483483424351NA329272231NANANANA
us-gaap:GeneralAndAdministrativeExpense ▇▇█▆▆▇▆▅▅▅▄▄▄▃▃▃▃▃▃▂▂▂▂▂▁2012012251801911941831581621651421411351151141121131061099810090979172NA636450NA423940NA31312925NA152218NANANANA
us-gaap:OperatingIncomeLoss ▁▅█▅▃▅█▅▄▄▇▄▃▄▄▄▃▄▆▄▃▃▅▄▃-309117223701247556114222461221730986210189355679083373255065714886784335781322733438NA1046554309NA755458241NA616616324154NA33617387NANANANA
us-gaap:InterestExpense ▇▇██▇▇█▇██▇▇▆▆▆▅▅▄▄▄▃▃▂▁▁64627068666568647070666055555550464341413330221717NA241917NA171611NA7777NA894NANANANA
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument bkng:ConvertibleNotes▁▁▂▂▁▁▁▁▄▆▇██15151616151515151922232424NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument bkng:OtherLongtermDebt▇▇▇▇▇▇▇▇█▇▅▃▁42414241424142424342383330NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▂▇▅▅█▁▅▅▅▅▅▅▅▅▅▅▄▅▅▅▅▅▅▅▅-413248-7-40412-511-5-1223-45-34-30-28-27-35-39-89-41-32-29-26-26-17-17-22NA-26-19-19NA-24-12-12NA-4-4-8-13NA-18-7-7NANANANA
us-gaap:IncomeTaxExpenseBenefit ▁▂▃▂▂▁▃▂▂█▃▂▁▂▂▂▂▂▂▂▁▂▂▂▁-23249413228203-1347323114614963461427188291111861122591317310024313984NA1879846NA1319347NA1381386036NA945126NANANANA
us-gaap:IncomeTaxesPaidNet █▂▁▂█▂▁▃█▂▁▁▆▁▂▁▅▁▁▂▄▂▁▁▄76288371338161245920078310124415362311647449342792379792618367NANANA228NANANA173NANANANA28NANANA15NANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▂▆▄▄▄▄▄▁▆▅▇█▅▁▅▃▆▄▄▆▁▃▁▄▅-7753-35-16-12-23-23-12760811113935-13413-5077-36-856-127-56-124-147NANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▁▆█▆▆▅▇▅▄▁█▆▅▄▅▄▄▆▆▅▄▄▆▅▄-850124519159189128031610844426-972180010478372166924184279341054698368264911562339NA948449179NA641295218NA390390265148NA298689NANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▁▆█▅▅▅█▅▄▁▇▅▄▅▄▄▄▄▆▄▄▄▆▄▄▄▅▄▃▄▄▄▃-699117119509797656461767977607-555172072045567350658037450411965173334511062576331378832437244288596352181NA469469256104NA22211453NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ▆▇▇▇▇▇█████▇▇▆▆▆▆▅▅▅▅▅▅▄▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁178622140221446214942236622687243702529625018254512578923458219941983820033196871833417420166141702716842149401518411600108131044410445986768556569621754285092397038153815336030652905NANANA1834NANANA
us-gaap:Liabilities ▇████▇▇▇▇▇▆▆▆▅▅▅▅▅▄▄▄▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁140271546915495161871545113902144181477714331141871290211853111609990101961041292828625808784698212637364503774359935264012396626242457244623242246119112651265121411891046NANANA476NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▆▇▇▇▇▇█████▇▇▆▆▆▆▅▅▅▅▅▅▄▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁178622140221446214942236622687243702529625018254512578923458219941983820033196871833417420166141702716842149401518411600108131044410445986768556569621754285092397038153815336030652905NANANA1834NANANA
us-gaap:StockholdersEquity ▂▄▄▃▄▅▆▆▇▇█▇▇▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▂▂▂▂▂▂▁▁▁▁▁383159335951530769158785995110472106361126012876115891081198209802927490528795852685578630856687337824720969096396585739903896357729272591257423902390198917241813NANANA1321NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital████▇▇▇▇▆████▇▇▇▇▇▇▆▆▆▆▆▆▆▅▅▂▂▂▁▁▁▁▁▁▁▁575857565678559955195445534352255034578357075633555854825410537752735184509750094926492348484703465045924459440826452612259325692536243123942394237223472417NANANA2289NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings███▇▇▇▆▆▆▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁2253023232220612011119132183671772015953149751393814513127931207211326106521014695669191868774906973664061885126454942183840300725702368210515241163103385885839616369NANANA-454NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent ▇███▅▇▇██▇▇▆▅▄▄▄▄▂▃▃▄▄▆▇▆▆▆▅▅▄▄▃▃▂▂▂▁▁▁926098331005610020707784079467100339504903491248272698754015833591448643553429846935967526773038508785574807489692660305682536545784203306628812881237621051957NANANA1022NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ███▇▃▄▄▄▄▄▄▄▃▃▃▄▃▂▃▃▄▄▆▅▂▂▂▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁6363631264665256233426242973318626222541284626342434208124222693185714771841188832553148504335031288128910961762161115368988121192632421421611551358533356348202NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▅▅▇▇▄▄▆▆▃▃▄▄▂▂▄▄▂▂▃▃▁▁▃▃▁▁▂▂▁▁▁▂▁▁▁1404843829123812716006179851111415433685683241349559623258264508487178166380428107107249319841521642011049595NANA61NANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:PropertyPlantAndEquipmentNet █████▇▇▇▆▅▅▅▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁7207387067166956566426135734804574253813473393202992742572462141982031681491351191099289817873645353494439NANANA30NANANA
us-gaap:LongTermInvestments ▁▃▃▃▇▇██20564477431946188445840891149444NA10872NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermInvestments us-gaap:InvestmentType bkng:LongtermInvestments▁█20564477NANANA8408NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ▅▇▇▇▇▇▇▇▆▆▆▅▅▅▅████████▄▄▄▄▄▁▁▁▁▁▁▁▁▁▁▁2391291328852915290729102845285027542737272724182402239624163360337833753386336633273326348319051771176717611738502522517508520504510510529525510NANANA350NANANA
 us-gaap:Goodwill us-gaap:ReportingUnit bkng:OpenTableAndKAYAK1500NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▇▇████▇▄▄▄▄▄▁▁▁▁▁▁▁▁▁▁▁18971954198520412078212521172162214021762218191419511993204020822128216722032246228223342175976998101910381052191208192196210200210210228234232NANANA172NANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:DistributionRights▇▇▇▇▇██████▆▆▆▆▆▆▇▇▇▇▇▇▄▄▄▅▅▁▁▁▁▁▁▁▁▂▂▂605628637660673691684702690701715512524538554568584596608622632654632403411421428431135146149151162163171171185189187NANANA143NANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNames▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇██████▇▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁124712771296132413471371136713911408142814491365138514051426144714681488150815291550157314474854935005085142225262730313333363738NANANA18NANANA
us-gaap:OtherAssetsNoncurrent █▇█▅▅▂▂▂▆▅▂▂▂▂▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁94286788554552918118319161360014616313010810755681181417976574833333335373535363841232121171714NANANA4NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LiabilitiesCurrent ▅▇▇█▇▅▅▇▆▅▅▅▄▄▄▃▃▂▂▃▂▂▂▂▂▂▃▃▂▂▂▂▂▂▂▂▂▂▁41365366552863495576355539305222444734973624375632482858290522091987143915821931170313791589150714301381182517711605146114751366129011051181118111261086471NANANA408NANANA
us-gaap:AccountsPayableCurrent ▆███▆▇▇▇▅▄▅▄▃▃▃▃▂▂▃▃▄▂▄▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁92612391275129193411341174105384166780559840741949443133432238836756728152534029924731231625018424020117314616916912711590NANANA60NANANA
us-gaap:AccruedLiabilitiesCurrent ▅▇▇▇█▆▇▆▅▅▅▅▄▄▄▄▅▃▃▄▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁12551578170417401877139916541418123811381091107398685788210191117681780903610600609555561545544387425387377272298222305305267322243NANANA127NANANA
 us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:BalanceSheetLocation,bkng:ContractLiabilityType bkng:DeferredMerchantBookings,bkng:Deferredrevenueindeferredmerchantbookings▁██144220218NANA149NANANA151NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:BalanceSheetLocation,bkng:ContractLiabilityType,bkng:CustomerIncentiveProgram us-gaap:AccruedLiabilities,bkng:CustomerIncentivePrograms,bkng:LoyaltyPrograms▁█▆768079NANA73NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:BalanceSheetLocation,bkng:ContractLiabilityType,bkng:CustomerIncentiveProgram us-gaap:AccruedLiabilities,bkng:CustomerIncentivePrograms,bkng:Othercustomerincentiveprograms▁▁█222225NANA61NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebt ▆▆▆▆▆██▇▇██▆▆▄▅▆▄▄▃▃▃▁▁75537640751276867619864987037764799088098726756472866170634772556321615854215399530438493887NANA1742NANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:A0.8SeniorNotesDueMarch2022▁▃▁▄▃▄▅▅█▇1094112010861135111911381156116212231194NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:A0.9SeniorConvertibleNotesDueSeptember2021█▇▆▆▅▄▃▃▂▁967961956950944939933927922916NANANA895NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:A1.8SeniorNotesDueMarch2027▁▃▁▃▃▄▅▅█▇1093111810861135111911391156116212241195NANANA1049NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:A2.15SeniorNotesDueNovember2022▁▃▁▃▃▄▅▅█▆822839815851839854867871917895NANANA785NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:A2.375SeniorNotesDueSeptember2024Member▁▃▁▃▃▄▅▅█▆1089111410821129111311331150115612171188NANANA1041NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:A3.6SeniorNotesDueJune2026███▄▄▄▁▁▁▁995995995994994994993993993993NANANA992NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument bkng:OtherLongtermDebt▁█▁███660067006600670067006700NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▆▆▆▆▆██▇▇██▆▆▄▅▆▄▄▃▃▃▁▁75537640751276867619864987037764799088098726756472866170634772556321615854215399530438493887NANA1742NANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▄▅▄▄▄█▇▇█▇▇▆▆▇▇▇▇▆▆▇▆▅▅▅▄▃▄▄▄▃▂▁▂▁▁▁▁▂▁93104949089162148143161148143134128138141143143134131146132103107106817583889068474143393737334742NANANA24NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▇████▁4384624664954880NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ▂▄▄▃▄▅▆▆▇▇█▇▇▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▂▂▂▂▂▂▁▁▁▁▁383159335951530769158785995110472106361126012876115891081198209802927490528795852685578630856687337824720969096396585739903896357729272591257423902390198917241813NANANA1321NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital████▇▇▇▇▆████▇▇▇▇▇▇▆▆▆▆▆▆▆▅▅▂▂▂▁▁▁▁▁▁▁▁575857565678559955195445534352255034578357075633555854825410537752735184509750094926492348484703465045924459440826452612259325692536243123942394237223472417NANANA2289NANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings███▇▇▇▆▆▆▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁2253023232220612011119132183671772015953149751393814513127931207211326106521014695669191868774906973664061885126454942183840300725702368210515241163103385885839616369NANANA-454NANANA
us-gaap:CommonStockValue ▁▁▁▁▁▁██████████████████████▇▇▇▇▇▇▇▇▇▇▇0.00.00.00.00.00.0489000.0489000.0488000.0487000.0486000.0486000.0486000.0485000.0484000.0484000.0484000.0482000.0482000.0482000.0481000.0480000.0480000.0480000.0478000.0476000.0468000.0467000.0452000.0450000.0450000.0450000.0449000.0446000.0446000.0446000.0446000.0445000.0438000.0NANANA405000.0NANANA
us-gaap:AdditionalPaidInCapital ████▇▇▇▇▆████▇▇▇▇▇▇▆▆▆▆▆▆▆▅▅▂▂▂▁▁▁▁▁▁▁▁575857565678559955195445534352255034578357075633555854825410537752735184509750094926492348484703465045924459440826452612259325692536243123942394237223472417NANANA2289NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▆▆▆▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁2253023232220612011119132183671772015953149751393814513127931207211326106521014695669191868774906973664061885126454942183840300725702368210515241163103385885839616369NANANA-454NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▂▂▂▂▁▂▃▄▅█▇▅▂▆▄▅▅▂▃▂▂▃▄▄▄▄▃▃▃▃▃▃▃▃▃▄▃▃-342-191-265-230-169-316-233-7656236653573247-134322135297244-185-43-224-259-7278928439-75-88-23-62-107-51-87-59-591910-32NANANA-3NANANA
us-gaap:TreasuryStockValue ██▇▇▆▅▅▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁24115228642152320173175671471112879106309430869879977411706768556584638560865826507339003046273722322084208319871943148311361060105810581057803802802799797640NANANA510NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁▆▆▆▆█▆▆▆▆▅▅▅▆▅▅▅▆▅67679797410172767168666659745454667558NANANANANANANANANANANANANANANANANANA14NANANANANANANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▁▆▆▆▆█▆▆▆▆▅▅▅▆▅▅▅▆▅67679797410172767168666659745454667558NANANANANANANANANANANANANANANANANANA14NANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▅█▇▃▅█▇▄▆█-38010771851178715010831963165064011731886NANANANANANANANANANANANANANANANANANANANANANANANANANA276NANANA104NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▃▄█▆▄▃▄▅▃▁17339676540802109409421271636-558-2105NANANANANANANANANANANANANANANANANANANANANANANANANANA55NANANA-311NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▄▄▁▂▃▃▅▃▅█-1281-1344-1389-2939-2548-1838-2203-1183-2205-900401NANANANANANANANANANANANANANANANANANANANANANANANANANA-147NANANA358NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▅█▇▃▅█▇▄▆█-38010771851178715010831963165064011731886NANANANANANANANANANANANANANANANANANANANANANANANANANA276NANANA104NANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▃▁▃▂█▂▂▃▁▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂79-6263-2041861144-32-2-28-129010110-213-1023-120-2NANANA-23NANANA-1NANANANA-4NANANA-1NANANANA
us-gaap:DeferredIncomeTaxExpenseBenefit ▂█▄▄█▁▅▄▅▅▆▅▄▄▅▃▄▅▄▅▄▅▆▆▅-9783-21-2989-124-4-298-615-16-24-397-54-252-22-6-35-1420178NANANA-7NANANA4NANANANA8NANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▃▄█▆▄▃▄▅▃▁17339676540802109409421271636-558-2105NANANANANANANANANANANANANANANANANANANANANANANANANANA55NANANA-311NANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▅▅▅▇▅▇▆█▃▄▄▄▃▃▃▃▂▂▃▁▂▁▁▁808782881118512010313164767670515460534742533140283229NANANA15NANANA13NANANANA8NANANA4NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▄▄▁▂▃▃▅▃▅█-1281-1344-1389-2939-2548-1838-2203-1183-2205-900401NANANANANANANANANANANANANANANANANANANANANANANANANANA-147NANANA358NANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▄▄▄██▆▇▄▃▃▂▂▂▂▂▂▂▃▄▃▂▂▁▁▁128113471349271827731860220511867187045673452092562322652598211280677308504148096NANANA76NANANA254NANANANA157NANANA118NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument bkng:A3.55SeniorNotesDueMarch2028▄▄▄▄▄▄▄▄▄▄0.03550.03550.03550.03550.03550.03550.03550.03550.03550.0355NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType bkng:A0.75SeniorConvertibleNotesDueMay2025Member,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType bkng:A4.1SeniorConvertibleNotesDueApril2025,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType bkng:A4.5SeniorNotesDueApril2027,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType bkng:A4.625SeniorNotesDueApril2030,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.00.00.00.00.00.0489000.0489000.0488000.0487000.0486000.0486000.0486000.0485000.0484000.0484000.0484000.0482000.0482000.0482000.0481000.0480000.0480000.0480000.0478000.0476000.0468000.0467000.0452000.0450000.0450000.0450000.0449000.0446000.0446000.0446000.0445000.0438000.0405000.0
Percentage of CommonStockValue0.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Shares Issued

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value636363636362626262626262626262626262626161616161616160605858585857575757575652
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312009-12-312008-12-31
Value6363636363626262626262626262626262626261616161616161606058585858575757565247
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312009-12-312008-12-31
Value-22-21-21-20-18-17-16-15-14-14-13-13-13-13-13-12-12-12-11-10-109999998888887-7-766
Percentage of CommonStockSharesOutstanding-35.4-34.4-33.4-32.3-30.0-27.5-25.9-24.1-23.2-22.7-22.1-21.6-21.3-21.1-20.9-20.6-20.3-20.0-19.1-17.5-16.416.015.315.115.115.115.314.514.214.114.114.114.113.5-13.5-13.113.114.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4142434547484949505049505051525253525352525151515151515151505050
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4142434547484848494949494950515152525251504949494949494949484746
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-17.0128.0746.0122.6217.0114.037.3920.3412.56-11.4135.1214.669.2613.6610.2411.717.5410.1423.6710.026.428.6520.2711.06.357.3216.228.624.895.7911.977.073.654.539.439.435.162.122.764.592.411.161.777.491.610.61
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-17.0127.7545.5422.4416.8513.8637.0220.1312.34-11.4134.4314.399.1113.4710.1311.67.4710.023.419.946.368.5620.0310.896.257.1415.728.394.765.6311.666.883.544.419.179.175.022.052.664.412.261.061.556.421.380.53
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2288333950403850283732134849353729282803443430242419234836902555214819993102228018401840283621231641154122691680130211901706132610379901452145211028097311001767584541730603462
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2288333950403850283732134849353729282803443430242419234836902555214819993102228018401840283621231641154122691680130211901706132610379901452145211028097311001767584541730603462
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

bkng:Advertisingandotherrevenues



Period End2020-03-312019-03-31
Value205285
Percentage of Revenues9.010.0
Percentage of Revenues9.010.0
Percentage of Revenues bkng:Advertisingandotherrevenues100.0100.0

bkng:AgencyRevenue



Period End2020-03-312019-03-31
Value14241949
Percentage of Revenues62.268.7
Percentage of Revenues62.268.7
Percentage of Revenues bkng:AgencyRevenue100.0100.0

bkng:MerchantRevenue



Period End2020-03-312019-03-31
Value659603
Percentage of Revenues28.821.3
Percentage of Revenues28.821.3
Percentage of Revenues bkng:MerchantRevenue100.0100.0

us-gaap:StatementGeographical

bkng:OtherGeographicalAreas



Period End2020-03-312019-03-31
Value326399
Percentage of Revenues14.214.1
Percentage of Revenues14.214.1
Percentage of Revenues bkng:OtherGeographicalAreas100.0100.0

country:NL



Period End2020-03-312019-03-31
Value16772072
Percentage of Revenues73.373.0
Percentage of Revenues73.373.0
Percentage of Revenues country:NL100.0100.0

country:US



Period End2020-03-312019-03-31
Value285366
Percentage of Revenues12.512.9
Percentage of Revenues12.512.9
Percentage of Revenues country:US100.0100.0

Sales Revenue Net

Realized Investment Gains Losses

Cost Of Goods And Services Sold

Gross Profit

Operating Expenses

us-gaap:OperatingExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value259721672670260322812069260223152197178322722058177714862755169714691221145814141238109512971149967942829699640545501483483424351329272231
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues113.564.953.067.680.464.453.765.575.163.651.368.173.563.374.766.468.461.147.062.067.359.645.754.258.941.549.353.737.641.148.433.333.338.543.532.935.539.6

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value201201225180191194183158162165142141135115114112113106109981009097917263645042394031312925152218
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.86.04.54.76.76.13.84.55.55.93.24.75.64.93.14.45.35.33.54.35.44.93.54.34.42.83.93.92.53.03.92.22.22.73.21.62.93.1

Selling And Marketing Expense

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-309117223701247556114222461221730986210189355679083373255065714886784335781322733438104655430975545824161661632415433617387
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-13.535.147.032.419.635.646.334.524.935.247.429.523.033.722.628.725.632.948.029.723.631.546.634.526.746.133.023.844.334.523.342.442.429.419.033.622.615.0

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value646270686665686470706660555555504643414133302217172419171716117777894
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.81.91.41.82.32.01.41.82.42.51.52.02.32.41.52.02.22.21.31.81.81.70.80.81.11.11.21.31.01.31.10.50.50.71.00.81.20.8

Interest Expense Debt

us-gaap:DebtInstrument

us-gaap:InterestExpenseDebt

bkng:ConvertibleNotes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value15151616151515151922232424
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.70.40.30.40.50.50.30.40.70.80.50.81.0
Percentage of Revenues bkng:ConvertibleNotes0.00.00.00.00.00.00.00.00.00.00.00.00.0

bkng:OtherLongtermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value42414241424142424342383330
Percentage of InterestExpenseDebt280.0273.3262.5256.2280.0263.3278.3281.6218.7191.0164.5137.9127.5
Percentage of Revenues1.81.20.81.11.51.30.91.21.51.50.91.11.3
Percentage of Revenues bkng:OtherLongtermDebt0.00.00.00.00.00.00.00.00.00.00.00.00.0

Gains Losses On Extinguishment Of Debt

Income Loss From Continuing Operations Before Income Taxes Domestic

Income Loss From Continuing Operations Before Income Taxes Foreign

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-413248-7-40412-511-5-1223-45-34-30-28-27-35-39-89-41-32-29-26-26-17-17-22-26-19-19-24-12-12-4-4-8-13-18-7-7
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-18.17.4-0.1-1.014.5-15.9-0.1-0.30.8-1.6-0.8-1.0-1.2-1.2-1.0-1.6-4.2-2.1-1.0-1.3-1.5-1.5-0.6-0.8-1.4-1.2-1.1-1.5-1.4-1.0-1.2-0.3-0.3-0.7-1.7-1.8-0.9-1.2

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-23249413228203-1347323114614963461427188291111861122591317310024313984187984613193471381386036945126
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-1.07.58.25.97.2-0.49.86.55.053.47.84.73.03.87.94.44.05.68.45.84.05.48.66.65.28.35.83.57.77.04.59.69.65.54.59.46.74.6

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value762883713381612459200783101244153623116474493427923797926183672281732815
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues33.32.60.73.528.83.91.25.726.83.60.51.422.21.03.11.820.91.70.94.120.64.30.90.922.417.616.73.62.7

Profit Loss

Income Loss From Continuing Operations Attributable To Noncontrolling Entity

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-7753-35-16-12-23-23-12760811113935-13413-5077-36-856-127-56-124-147
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-3.41.6-0.7-0.4-0.4-0.7-0.5-3.62.10.32.54.61.5-5.70.4-2.03.6-1.8-0.32.5-6.9-3.1-4.4-0.70.5

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-7753-35-16-12-23-23-12960811113935-13413-5077
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.9100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-3.41.6-0.7-0.4-0.4-0.7-0.5-3.62.10.32.54.61.5-5.70.4-2.03.6
Percentage of Revenues us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-850124519159189128031610844426-972180010478372166924184279341054698368264911562339948449179641295218390390265148298689
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-37.237.338.023.832.125.033.223.914.6-34.740.634.634.69.218.816.419.946.734.030.620.014.432.126.520.741.826.813.837.622.321.126.926.924.118.329.88.91.6

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

Net Income Loss

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-699117119509797656461767977607-55517207204556735065803745041196517333451106257633137883243724428859635218146946925610422211453
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-30.635.138.725.427.020.136.527.620.7-19.838.823.818.828.713.722.717.425.238.622.718.124.637.427.120.224.536.726.018.824.235.026.617.532.332.323.212.922.315.09.2

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-699117119509797656451767978607-555172072045567350658037450411965173334511062576331244181104
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-30.635.138.725.427.020.136.527.620.7-19.838.823.818.828.713.722.717.425.238.622.718.124.637.427.120.218.817.512.9
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value178622140221446214942236622687243702529625018254512578923458219941983820033196871833417420166141702716842149401518411600108131044410445986768556569621754285092397038153360306529051834
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value14027154691549516187154511390214418147771433114187129021185311160999010196104129282862580878469821263736450377435993526401239662624245724462324224611911265121411891046476
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets78.572.372.375.369.161.359.258.457.355.750.050.550.750.450.952.950.649.548.749.748.842.742.532.533.333.838.440.238.337.439.342.844.130.033.236.238.836.026.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value178622140221446214942236622687243702529625018254512578923458219941983820033196871833417420166141702716842149401518411600108131044410445986768556569621754285092397038153360306529051834
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value383159335951530769158785995110472106361126012876115891081198209802927490528795852685578630856687337824720969096396585739903896357729272591257423901989172418131321698
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.427.727.724.730.938.740.841.442.544.249.949.449.249.548.947.149.450.551.350.351.257.357.567.466.766.261.259.458.259.357.553.950.964.862.659.256.362.472.10.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:StatementEquityComponents

us-gaap:ForeignExchangeForward, us-gaap:NetInvestmentHedging, us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-35-35-35-35-35-35-35-35-35-35-35-35-35-35-34-34-34-34
Percentage of StockholdersEquity-0.9-0.6-0.6-0.7-0.5-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4-0.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:ForeignExchangeForward us-gaap:NetInvestmentHedging us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-126-52-28-187252677709522176498325437462
Percentage of StockholdersEquity-3.3-0.9-0.4-2.12.25.36.14.81.85.13.54.85.3
Percentage of Assets-0.7-0.2-0.1-0.81.02.63.02.40.92.51.72.42.7
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-342-191-265-230-169-316-233-7656236653573247-134322135297244-185-43-224-259-7278928439-75-88-23-62-107-51-87-591910-32-3-40
Percentage of StockholdersEquity-8.9-3.2-4.5-4.3-2.4-3.6-2.3-0.70.52.15.15.02.3-1.43.31.53.32.8-2.2-0.5-2.6-3.0-0.81.01.31.20.6-1.3-2.2-0.6-1.8-3.7-2.0-3.4-2.51.00.6-1.8-0.2-5.8
Percentage of Assets-1.9-0.9-1.2-1.1-0.8-1.4-1.0-0.30.20.92.52.41.1-0.71.60.71.61.4-1.1-0.3-1.3-1.7-0.50.70.90.80.4-0.8-1.3-0.4-1.0-2.0-1.0-2.2-1.60.60.3-1.1-0.20.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-216-139-192-157-141-129-106-8245-15-23-135-275-311-176-190-139-217
Percentage of StockholdersEquity-5.6-2.3-3.2-3.0-2.0-1.5-1.1-0.80.4-0.1-0.2-1.2-2.5-3.2-1.8-2.1-1.5-2.5
Percentage of Assets-1.2-0.6-0.9-0.7-0.6-0.6-0.4-0.30.2-0.1-0.1-0.6-1.3-1.6-0.9-1.0-0.8-1.2
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value5758575656785599551954455343522550345783570756335558548254105377527351845097500949264923484847034650459244594408264526122593256925362431239423722347241722892176
Percentage of StockholdersEquity150.397.095.4105.579.862.053.749.947.351.444.348.651.455.855.258.058.358.959.858.557.157.555.560.164.566.569.775.366.367.072.587.797.994.4100.2119.2136.1133.3173.3311.5
Percentage of Assets32.226.926.526.024.724.021.920.720.122.722.124.025.327.627.027.328.829.830.729.429.333.031.940.543.044.042.744.738.639.841.747.349.861.262.770.676.683.2124.80.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value0000000000000000000000000000000000000000
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value2253023232220612011119132183671772015953149751393814513127931207211326106521014695669191868774906973664061885126454942183840300725702368210515241163103385839616369-454-944
Percentage of StockholdersEquity588.1391.6370.7379.0276.7209.1178.1152.3140.8123.8112.7110.4111.7115.3108.7109.4105.7104.5101.987.580.877.570.965.563.161.160.051.364.460.858.852.144.940.235.919.99.53.8-34.4-135.1
Percentage of Assets126.1108.6102.993.685.581.072.763.159.954.856.354.554.957.153.251.552.252.852.344.041.444.440.844.242.140.436.830.537.536.133.928.122.826.022.511.85.32.4-24.80.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-24115-22864-21523-20173-17567-14711-12879-10630-9430-8698-7997-7411-7067-6855-6584-6385-6086-5826-5073-3900-3046-2737-2232-2084-2083-1987-1943-1483-1136-1060-1058-1058-1057-803-802-799-797-640-510-493
Percentage of StockholdersEquity-629.5-385.4-361.7-380.1-254.0-167.5-129.4-101.5-88.7-77.3-62.1-63.9-65.4-69.8-67.2-68.8-67.2-66.2-59.5-45.6-35.3-32.0-25.6-26.6-28.9-28.8-30.4-25.3-28.5-27.2-29.6-36.2-40.8-31.2-33.6-40.2-46.3-35.3-38.7-70.6
Percentage of Assets-135.0-106.8-100.4-93.9-78.5-64.8-52.8-42.0-37.7-34.2-31.0-31.6-32.1-34.6-32.9-32.4-33.2-33.4-30.5-22.9-18.1-18.3-14.7-18.0-19.3-19.0-18.6-15.0-16.6-16.1-17.0-19.5-20.8-20.2-21.0-23.8-26.0-22.0-27.90.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value926098331005610020707784079467100339504903491248272698754015833591448643553429846935967526773038508785574807489692660305682536545784203306628812376210519571022
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets51.845.946.946.631.637.138.839.738.035.535.435.331.827.229.130.026.520.425.927.635.435.348.173.372.671.671.770.288.086.586.384.382.577.275.570.768.767.455.8

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value6363631264665256233426242973318626222541284626342434208124222693185714771841188832553148504335031288128910961762161115368988121192632421611551358533356348202364385
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.629.530.224.510.411.612.212.610.510.011.011.211.110.512.113.710.18.511.111.119.321.133.230.211.912.410.517.923.523.414.415.023.415.911.018.218.012.40.00.00.011.00.00.0

Accounts Receivable Net Current

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value1404843829123812716006179851111415433685683241349559623258264508487178166380428107107249319841521642011049561
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.93.93.95.85.72.62.53.94.41.61.72.93.11.21.72.83.41.51.63.02.91.21.13.34.01.01.02.54.71.32.53.04.02.62.52.1

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7207387067166956566426135734804574253813473393202992742572462141982031681491351191099289817873645349443930
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.03.43.33.33.12.92.62.42.31.91.81.81.71.71.71.61.61.61.51.41.31.31.31.51.41.31.11.11.31.41.31.41.41.61.41.51.41.41.7

Long Term Investments

us-gaap:LongTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2056447743194618844584089114944410872
Percentage of LongTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.520.920.121.537.837.137.437.342.7

us-gaap:InvestmentType

bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value205644778408
Percentage of LongTermInvestments100.0100.0100.0
Percentage of Assets11.520.937.1
Percentage of Assets bkng:LongtermInvestments0.00.00.0

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value2391291328852915290729102845285027542737272724182402239624163360337833753386336633273326348319051771176717611738502522517508520504510529525510350326
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.413.613.513.613.012.811.711.311.010.810.610.310.912.112.117.118.419.420.419.819.822.322.916.416.416.916.917.67.38.08.39.410.212.713.415.817.217.619.10.0

us-gaap:ReportingUnit

bkng:OpenTableAndKAYAK



Period End2020-03-31
Value1500
Percentage of Goodwill62.7
Percentage of Assets8.4
Percentage of Assets bkng:OpenTableAndKAYAK0.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value18971954198520412078212521172162214021762218191419511993204020822128216722032246228223342175976998101910381052191208192196210200210228234232172193
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.69.19.39.59.39.48.78.58.68.68.68.28.910.110.210.611.612.413.313.213.615.614.38.49.29.89.910.72.83.23.13.64.15.05.56.87.68.09.40.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:DistributionRights



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value605628637660673691684702690701715512524538554568584596608622632654632403411421428431135146149151162163171185189187143
Percentage of IntangibleAssetsNetExcludingGoodwill31.932.132.132.332.432.532.432.532.332.232.326.826.927.027.227.327.527.527.627.727.728.029.141.341.341.341.241.070.870.477.777.577.081.581.281.080.880.983.4
Percentage of Assets3.42.93.03.13.03.02.82.82.82.82.82.22.42.72.82.93.23.43.73.73.84.44.23.53.84.04.14.42.02.22.42.83.24.14.55.56.26.57.8
Percentage of Assets us-gaap:DistributionRights0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InternetDomainNames



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value789101011111113131414131416171919182020242730323334343235151517444313
Percentage of IntangibleAssetsNetExcludingGoodwill0.40.40.50.50.50.50.50.50.60.60.60.70.70.70.80.90.90.90.90.90.91.11.23.23.23.33.33.317.117.28.28.18.32.32.21.81.40.72.3
Percentage of Assets0.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.30.30.30.30.30.50.50.30.30.30.10.10.10.10.10.2
Percentage of Assets us-gaap:InternetDomainNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value0000000000000000000000000000
Percentage of IntangibleAssetsNetExcludingGoodwill0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TechnologyBasedIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value384143474852535727323831
Percentage of IntangibleAssetsNetExcludingGoodwill2.02.12.22.32.32.42.52.61.31.51.71.6
Percentage of Assets0.20.20.20.20.20.20.20.20.10.10.10.2
Percentage of Assets us-gaap:TechnologyBasedIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TradeNames



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value124712771296132413471371136713911408142814491365138514051426144714681488150815291550157314474854935005085142225262730313336373818
Percentage of IntangibleAssetsNetExcludingGoodwill65.765.465.364.964.864.564.664.365.865.665.471.371.070.569.969.569.068.768.568.167.967.466.549.749.449.148.948.912.012.313.914.114.415.515.716.016.116.410.9
Percentage of Assets7.06.06.06.26.06.05.65.55.65.65.65.86.37.17.17.48.08.59.19.09.210.59.54.24.64.84.95.20.30.40.40.50.60.80.91.11.21.31.0
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9428678855455291811831916136001461631301081075568118141797657483333333537353536384123211717144
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.34.14.12.52.40.80.80.82.52.40.60.70.60.50.50.30.40.70.90.50.50.40.30.30.30.30.30.40.50.50.60.70.80.60.60.50.60.50.2

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4136536655286349557635553930522244473497362437563248285829052209198714391582193117031379158915071430138118251771160514611475136612901105118111261086471408
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.225.125.829.524.915.716.120.617.813.714.116.014.814.414.511.210.88.39.511.310.19.210.513.013.213.217.518.023.422.223.725.225.327.831.033.535.516.222.3

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-012017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9261239127512919341134117410538418396678055984074194944313343223883675672815253402992473123162501842402011731461691271159060
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.25.85.96.04.25.04.84.23.40.02.63.12.61.92.12.52.21.81.92.32.23.41.93.52.92.82.43.03.23.72.83.93.73.43.74.43.83.83.13.3

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-012017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value125515781704174018771399165414181238118311381091107398685788210191117681780903610600609555561545544387425387377272298222305267322243127
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.07.47.98.18.46.26.85.65.00.04.54.24.64.54.34.45.26.13.94.75.33.64.04.04.85.25.25.23.96.25.96.15.05.95.68.08.010.58.47.0

Operating Lease Liability Current

Contract With Customer Liability Current

us-gaap:BalanceSheetLocation, bkng:ContractLiabilityType

us-gaap:ContractWithCustomerLiabilityCurrent

bkng:DeferredMerchantBookings, bkng:Deferredrevenueindeferredmerchantbookings



Period End2020-03-312019-12-312019-09-302018-12-312017-12-31
Value144220218149151
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0
Percentage of Assets0.81.01.00.70.6
Percentage of Assets bkng:DeferredMerchantBookings bkng:Deferredrevenueindeferredmerchantbookings0.00.00.00.00.0

us-gaap:BalanceSheetLocation, bkng:ContractLiabilityType, bkng:CustomerIncentiveProgram

us-gaap:AccruedLiabilities, bkng:CustomerIncentivePrograms, bkng:LoyaltyPrograms



Period End2020-03-312019-12-312019-09-302018-12-31
Value76807973
Percentage of ContractWithCustomerLiabilityCurrent52.836.436.249.0
Percentage of Assets0.40.40.40.3
Percentage of Assets us-gaap:AccruedLiabilities bkng:CustomerIncentivePrograms bkng:LoyaltyPrograms0.00.00.00.0

us-gaap:AccruedLiabilities, bkng:CustomerIncentivePrograms, bkng:Othercustomerincentiveprograms



Period End2020-03-312019-12-312019-09-302018-12-31
Value22222561
Percentage of ContractWithCustomerLiabilityCurrent15.310.011.540.9
Percentage of Assets0.10.10.10.3
Percentage of Assets us-gaap:AccruedLiabilities bkng:CustomerIncentivePrograms bkng:Othercustomerincentiveprograms0.00.00.00.0

Long Term Debt

us-gaap:LongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value755376407512768676198649870377647990880987267564728661706347725563216158542153995304384938871742
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.335.735.035.834.138.135.730.731.934.633.832.233.131.131.736.934.535.432.631.731.525.825.616.7

us-gaap:DebtInstrument

bkng:A0.8SeniorNotesDueMarch2022



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1094112010861135111911381156116212231194
Percentage of LongTermDebt14.514.714.514.814.713.213.315.015.313.6
Percentage of Assets6.15.25.15.35.05.04.74.64.94.7
Percentage of Assets bkng:A0.8SeniorNotesDueMarch20220.00.00.00.00.00.00.00.00.00.0

bkng:A0.9SeniorConvertibleNotesDueSeptember2021



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value967961956950944939933927922916895
Percentage of LongTermDebt12.812.612.712.412.410.910.711.911.510.414.5
Percentage of Assets5.44.54.54.44.24.13.83.73.73.64.5
Percentage of Assets bkng:A0.9SeniorConvertibleNotesDueSeptember20210.00.00.00.00.00.00.00.00.00.00.0

bkng:A1.8SeniorNotesDueMarch2027



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10931118108611351119113911561162122411951049
Percentage of LongTermDebt14.514.614.514.814.713.213.315.015.313.617.0
Percentage of Assets6.15.25.15.35.05.04.74.64.94.75.3
Percentage of Assets bkng:A1.8SeniorNotesDueMarch20270.00.00.00.00.00.00.00.00.00.00.0

bkng:A2.15SeniorNotesDueNovember2022



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value822839815851839854867871917895785
Percentage of LongTermDebt10.911.010.811.111.09.910.011.211.510.212.7
Percentage of Assets4.63.93.84.03.83.83.63.43.73.54.0
Percentage of Assets bkng:A2.15SeniorNotesDueNovember20220.00.00.00.00.00.00.00.00.00.00.0

bkng:A2.375SeniorNotesDueSeptember2024Member



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10891114108211291113113311501156121711881041
Percentage of LongTermDebt14.414.614.414.714.613.113.214.915.213.516.9
Percentage of Assets6.15.25.05.35.05.04.74.64.94.75.3
Percentage of Assets bkng:A2.375SeniorNotesDueSeptember2024Member0.00.00.00.00.00.00.00.00.00.00.0

bkng:A2.75SeniorNotesDueMarch2023



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value498498498498497497497497496496
Percentage of LongTermDebt6.66.56.66.56.55.75.76.46.25.6
Percentage of Assets2.82.32.32.32.22.22.02.02.02.0
Percentage of Assets bkng:A2.75SeniorNotesDueMarch20230.00.00.00.00.00.00.00.00.00.0

bkng:A3.55SeniorNotesDueMarch2028



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value497497497497497497496496496496
Percentage of LongTermDebt6.66.56.66.56.55.75.76.46.25.6
Percentage of Assets2.82.32.32.32.22.22.02.02.02.0
Percentage of Assets bkng:A3.55SeniorNotesDueMarch20280.00.00.00.00.00.00.00.00.00.0

bkng:A3.65SeniorNotesDueMarch2025



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value498498497497497497497496496496496
Percentage of LongTermDebt6.66.56.66.56.55.75.76.46.25.68.0
Percentage of Assets2.82.32.32.32.22.22.02.02.02.02.5
Percentage of Assets bkng:A3.65SeniorNotesDueMarch20250.00.00.00.00.00.00.00.00.00.00.0

bkng:A3.6SeniorNotesDueJune2026



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value995995995994994994993993993993992
Percentage of LongTermDebt13.213.013.212.913.011.511.412.812.411.316.1
Percentage of Assets5.64.64.64.64.44.44.13.94.03.95.0
Percentage of Assets bkng:A3.6SeniorNotesDueJune20260.00.00.00.00.00.00.00.00.00.00.0

bkng:OtherLongtermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value660067006600670067006700
Percentage of LongTermDebt87.487.787.987.287.977.5
Percentage of Assets36.931.330.831.230.029.5
Percentage of Assets bkng:OtherLongtermDebt0.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value755376407512768676198649870377647990880987267564728661706347725563216158542153995304384938871742
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.335.735.035.834.138.135.730.731.934.633.832.233.131.131.736.934.535.432.631.731.525.825.616.7

Deferred Tax Liabilities Noncurrent

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value93104949089162148143161148143134128138141143143134131146132103107106817583889068474143393733474224
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.40.40.40.70.60.60.60.60.60.60.60.70.70.70.80.80.80.90.80.70.70.90.80.70.80.91.31.00.80.80.91.01.01.01.51.51.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4384624664954880
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.00.0
Percentage of Assets2.52.22.22.32.20.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value383159335951530769158785995110472106361126012876115891081198209802927490528795852685578630856687337824720969096396585739903896357729272591257423901989172418131321698
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.427.727.724.730.938.740.841.442.544.249.949.449.249.548.947.149.450.551.350.351.257.357.567.466.766.261.259.458.259.357.553.950.964.862.659.256.362.472.10.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:StatementEquityComponents

us-gaap:ForeignExchangeForward, us-gaap:NetInvestmentHedging, us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-35-35-35-35-35-35-35-35-35-35-35-35-35-35-34-34-34-34
Percentage of StockholdersEquity-0.9-0.6-0.6-0.7-0.5-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4-0.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:ForeignExchangeForward us-gaap:NetInvestmentHedging us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-126-52-28-187252677709522176498325437462
Percentage of StockholdersEquity-3.3-0.9-0.4-2.12.25.36.14.81.85.13.54.85.3
Percentage of Assets-0.7-0.2-0.1-0.81.02.63.02.40.92.51.72.42.7
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-342-191-265-230-169-316-233-7656236653573247-134322135297244-185-43-224-259-7278928439-75-88-23-62-107-51-87-591910-32-3-40
Percentage of StockholdersEquity-8.9-3.2-4.5-4.3-2.4-3.6-2.3-0.70.52.15.15.02.3-1.43.31.53.32.8-2.2-0.5-2.6-3.0-0.81.01.31.20.6-1.3-2.2-0.6-1.8-3.7-2.0-3.4-2.51.00.6-1.8-0.2-5.8
Percentage of Assets-1.9-0.9-1.2-1.1-0.8-1.4-1.0-0.30.20.92.52.41.1-0.71.60.71.61.4-1.1-0.3-1.3-1.7-0.50.70.90.80.4-0.8-1.3-0.4-1.0-2.0-1.0-2.2-1.60.60.3-1.1-0.20.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-216-139-192-157-141-129-106-8245-15-23-135-275-311-176-190-139-217
Percentage of StockholdersEquity-5.6-2.3-3.2-3.0-2.0-1.5-1.1-0.80.4-0.1-0.2-1.2-2.5-3.2-1.8-2.1-1.5-2.5
Percentage of Assets-1.2-0.6-0.9-0.7-0.6-0.6-0.4-0.30.2-0.1-0.1-0.6-1.3-1.6-0.9-1.0-0.8-1.2
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value5758575656785599551954455343522550345783570756335558548254105377527351845097500949264923484847034650459244594408264526122593256925362431239423722347241722892176
Percentage of StockholdersEquity150.397.095.4105.579.862.053.749.947.351.444.348.651.455.855.258.058.358.959.858.557.157.555.560.164.566.569.775.366.367.072.587.797.994.4100.2119.2136.1133.3173.3311.5
Percentage of Assets32.226.926.526.024.724.021.920.720.122.722.124.025.327.627.027.328.829.830.729.429.333.031.940.543.044.042.744.738.639.841.747.349.861.262.770.676.683.2124.80.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value0000000000000000000000000000000000000000
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value2253023232220612011119132183671772015953149751393814513127931207211326106521014695669191868774906973664061885126454942183840300725702368210515241163103385839616369-454-944
Percentage of StockholdersEquity588.1391.6370.7379.0276.7209.1178.1152.3140.8123.8112.7110.4111.7115.3108.7109.4105.7104.5101.987.580.877.570.965.563.161.160.051.364.460.858.852.144.940.235.919.99.53.8-34.4-135.1
Percentage of Assets126.1108.6102.993.685.581.072.763.159.954.856.354.554.957.153.251.552.252.852.344.041.444.440.844.242.140.436.830.537.536.133.928.122.826.022.511.85.32.4-24.80.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-24115-22864-21523-20173-17567-14711-12879-10630-9430-8698-7997-7411-7067-6855-6584-6385-6086-5826-5073-3900-3046-2737-2232-2084-2083-1987-1943-1483-1136-1060-1058-1058-1057-803-802-799-797-640-510-493
Percentage of StockholdersEquity-629.5-385.4-361.7-380.1-254.0-167.5-129.4-101.5-88.7-77.3-62.1-63.9-65.4-69.8-67.2-68.8-67.2-66.2-59.5-45.6-35.3-32.0-25.6-26.6-28.9-28.8-30.4-25.3-28.5-27.2-29.6-36.2-40.8-31.2-33.6-40.2-46.3-35.3-38.7-70.6
Percentage of Assets-135.0-106.8-100.4-93.9-78.5-64.8-52.8-42.0-37.7-34.2-31.0-31.6-32.1-34.6-32.9-32.4-33.2-33.4-30.5-22.9-18.1-18.3-14.7-18.0-19.3-19.0-18.6-15.0-16.6-16.1-17.0-19.5-20.8-20.2-21.0-23.8-26.0-22.0-27.90.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.00.00.00.00.00.0489000.0489000.0488000.0487000.0486000.0486000.0486000.0485000.0484000.0484000.0484000.0482000.0482000.0482000.0481000.0480000.0480000.0480000.0478000.0476000.0468000.0467000.0452000.0450000.0450000.0450000.0449000.0446000.0446000.0446000.0445000.0438000.0405000.0
Percentage of CommonStockValue0.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value575857565678559955195445534352255034578357075633555854825410537752735184509750094926492348484703465045924459440826452612259325692536243123942372234724172289
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.226.926.526.024.724.021.920.720.122.722.124.025.327.627.027.328.829.830.729.429.333.031.940.543.044.042.744.738.639.841.747.349.861.262.770.676.683.2124.8

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-012017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value225302323222061201111913218367177201595314975141271393814513127931207211326106521014695669191868774906973664061885126454942183840300725702368210515241163103385839616369-454
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets126.1108.6102.993.685.581.072.763.159.90.054.856.354.554.957.153.251.552.252.852.344.041.444.440.844.242.140.436.830.537.536.133.928.122.826.022.511.85.32.4-24.8

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-342-191-265-230-169-316-233-7656236653573247-134322135297244-185-43-224-259-7278928439-75-88-23-62-107-51-87-591910-32-3-40
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.9-0.9-1.2-1.1-0.8-1.4-1.0-0.30.20.92.52.41.1-0.71.60.71.61.4-1.1-0.3-1.3-1.7-0.50.70.90.80.4-0.8-1.3-0.4-1.0-2.0-1.0-2.2-1.60.60.3-1.1-0.20.0

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value24115228642152320173175671471112879106309430869879977411706768556584638560865826507339003046273722322084208319871943148311361060105810581057803802799797640510
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets135.0106.8100.493.978.564.852.842.037.734.231.031.632.134.632.932.433.233.430.522.918.118.314.718.019.319.018.615.016.616.117.019.520.820.221.023.826.022.027.9

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302011-03-31
Value6767979741017276716866665974545466755814
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302011-03-31
Value6767979741017276716866665974545466755814
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-03-312010-03-31
Value-38010771851178715010831963165064011731886276104
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-16.632.336.746.45.333.740.546.721.941.942.534.117.9

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-03-312010-03-31
Value17339676540802109409421271636-558-210555-311
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues75.72.915.2106.074.312.70.93.655.9-19.9-47.56.8-53.3

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-03-312010-03-31
Value-1281-1344-1389-2939-2548-1838-2203-1183-2205-900401-147358
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-56.0-40.3-27.6-76.3-89.8-57.2-45.5-33.5-75.3-32.19.0-18.261.4

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-03-312010-03-31
Value-38010771851178715010831963165064011731886276104
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-16.632.336.746.45.333.740.546.721.941.942.534.117.9

Net Income Loss

Profit Loss

Depreciation Depletion And Amortization

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value79-6263-2041861144-32-2-28-129010110-213-1023-120-2-23-1-4-1
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value-9783-21-2989-124-4-298-615-16-24-397-54-252-22-6-35-1420178-748
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation

Amortization Of Financing Costs

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-03-312010-03-31
Value17339676540802109409421271636-558-210555-311
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues75.72.915.2106.074.312.70.93.655.9-19.9-47.56.8-53.3

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value808782881118512010313164767670515460534742533140283229151384
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302011-03-312010-03-31
Value-1281-1344-1389-2939-2548-1838-2203-1183-2205-900401-147358
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-56.0-40.3-27.6-76.3-89.8-57.2-45.5-33.5-75.3-32.19.0-18.261.4

Proceeds From Issuance Of Long Term Debt

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value12811347134927182773186022051186718704567345209256232265259821128067730850414809676254157118
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

bkng:A3.55SeniorNotesDueMarch2028



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-08-312017-08-15
Value0.03550.03550.03550.03550.03550.03550.03550.03550.03550.03550.02550.0355
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations bkng:A3.55SeniorNotesDueMarch20280.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DebtInstrument, us-gaap:SubsequentEventType

bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value0.0075
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations bkng:A0.75SeniorConvertibleNotesDueMay2025Member us-gaap:SubsequentEvent0.0

bkng:A4.1SeniorConvertibleNotesDueApril2025, us-gaap:SubsequentEvent



Period End2020-04-30
Value0.041
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations bkng:A4.1SeniorConvertibleNotesDueApril2025 us-gaap:SubsequentEvent0.0

bkng:A4.5SeniorNotesDueApril2027, us-gaap:SubsequentEvent



Period End2020-04-30
Value0.045
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations bkng:A4.5SeniorNotesDueApril2027 us-gaap:SubsequentEvent0.0

bkng:A4.625SeniorNotesDueApril2030, us-gaap:SubsequentEvent



Period End2020-04-30
Value0.04625
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations bkng:A4.625SeniorNotesDueApril2030 us-gaap:SubsequentEvent0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.0310.1750.1890.210.2110.1920.1940.1680.1660.1360.3660.1620.187
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:EmployeeStockOption



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value15022.015122.024727.025867.026099.027263.027362.027892.028248.030675.033799.037302.044381.048983.052767.061732.074081.089104.094491.0111834.0125073.0146385.0137708.071001.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:EmployeeStockOption



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value485.0484.0386.0391.0404.0386.97390.64393.92395.35401.61388.65396.25365.2372.07389.93389.49393.62383.03384.44377.83373.03380.05315.3619.73
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:PerformanceShares



Period End2020-03-31
Value0.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value152832.04892.09933.010697.0131683.09408.03259.06910.097006.07550.06743.05119.081202.09139.09010.017904.080952.012100.05399.05133.067886.014153.03808.031980.01371.04334.043431.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Liabilities

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value5966206106396350
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.00.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value638363326485527623542645299432072644256328472635243420822423269414783149
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:AccountsReceivableCreditLossExpenseReversalAndChargebacks



Period End2020-03-312019-03-31
Value26240
Percentage of AccountsReceivableCreditLossExpenseReversalAndChargebacks100.0100.0

us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

bkng:AdditionalPaymentToDebtHolderSettledInSharesAggregateValueOfShares

srt:Maximum, bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value273
Percentage of AdditionalPaymentToDebtHolderSettledInSharesAggregateValueOfShares100.0

srt:Minimum, bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value0
Percentage of AdditionalPaymentToDebtHolderSettledInSharesAggregateValueOfShares0.0

us-gaap:DebtInstrument

bkng:DebtInstrumentCouponInterestExpense

bkng:ConvertibleNotes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value3333333344555
Percentage of DebtInstrumentCouponInterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:OtherLongtermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value40404040403940414140363129
Percentage of DebtInstrumentCouponInterestExpense1333.31333.31333.31333.31333.31240.61309.71284.4924.4832.7683.3587.0526.8

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bkng:EquitySecuritiesFVNICostOfSecuritiesSold

bkng:Trip.comGroup



Period End2020-03-31
Value124
Percentage of EquitySecuritiesFVNICostOfSecuritiesSold100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bkng:Trip.comGroup, us-gaap:SubsequentEvent



Period End2020-05-07
Value531
Percentage of EquitySecuritiesFVNICostOfSecuritiesSold0.0

bkng:ForeignCurrencyTransactionGainLossbeforetaxassociatedwiththeremeasurementofnonfunctionalcurrencydebt



Period End2020-03-312019-03-31
Value330
Percentage of ForeignCurrencyTransactionGainLossbeforetaxassociatedwiththeremeasurementofnonfunctionalcurrencydebt100.00.0

bkng:ForeignCurrencyTransactionsAndOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-2655-682381617158141065
Percentage of ForeignCurrencyTransactionsAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:Noncashleaseexpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value46454243420000
Percentage of Noncashleaseexpense100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject, dei:LegalEntity

bkng:PaymentOfContractualObligation

bkng:Headquarters, bkng:Booking.com



Period End2020-03-31
Value168
Percentage of PaymentOfContractualObligation100.0

us-gaap:DebtInstrument, us-gaap:SubsequentEventType

bkng:PercentageOnConversionPriceOfClosingPriceOfCommonStockTradedForAtLeast20TradingDaysOutOf30ConsecutiveTradingDaysInPeriodOnLastTradingDayOfPreviousQuarter

bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value1.3
Percentage of PercentageOnConversionPriceOfClosingPriceOfCommonStockTradedForAtLeast20TradingDaysOutOf30ConsecutiveTradingDaysInPeriodOnLastTradingDayOfPreviousQuarter100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bkng:ProceedsfromSaleofEquitySecuritiesFVNI

bkng:Trip.comGroup



Period End2020-03-31
Value94
Percentage of ProceedsfromSaleofEquitySecuritiesFVNI100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bkng:Trip.comGroup, us-gaap:SubsequentEvent



Period End2020-05-07
Value431
Percentage of ProceedsfromSaleofEquitySecuritiesFVNI0.0

bkng:ReclassificationAdjustmentForConvertibleDebtInMezzanine



Period End2020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-40455-4865
Percentage of ReclassificationAdjustmentForConvertibleDebtInMezzanine100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-40455-4865
Percentage of ReclassificationAdjustmentForConvertibleDebtInMezzanine100.0100.0100.0100.0100.0100.0100.0

us-gaap:Range, us-gaap:ReportingUnit

bkng:ReportingUnitEstimatedImpactOnFairValueAssessment

srt:Maximum, bkng:OpenTableAndKAYAK



Period End2020-03-31
Value230
Percentage of ReportingUnitEstimatedImpactOnFairValueAssessment100.0

srt:Minimum, bkng:OpenTableAndKAYAK



Period End2020-03-31
Value-410
Percentage of ReportingUnitEstimatedImpactOnFairValueAssessment-178.3

bkng:Salesandotherexpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value377216276248215217242203165134151121109
Percentage of Salesandotherexpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:ShareBasedCompensationAndOtherStockBasedExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value118083847810576787168666659
Percentage of ShareBasedCompensationAndOtherStockBasedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

bkng:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares



Period End2020-03-31
Value1834.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue100.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-31
Value1805.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue98.4

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value12959161217826119561177733811746565400967688157
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value6767979741017074716866665874545466745860546646353834342117171613131313211511
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType, bkng:Typeofstockbasedcompensation

us-gaap:PerformanceShares, bkng:Adjustmentforchangeinestimatedprobableoutcomeattheendoftheperformanceperiod



Period End2020-03-31
Value73
Percentage of AllocatedShareBasedCompensationExpense1216.7

us-gaap:AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease



Period End2020-03-312019-03-31
Value-2-1
Percentage of AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs



Period End2020-03-312019-03-31
Value118
Percentage of AllowanceForDoubtfulAccountsReceivableWriteOffs100.0100.0

us-gaap:DebtInstrument

us-gaap:AmortizationOfDebtDiscountPremium

bkng:A0.35SeniorConvertibleNotesDueJune2020



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1101100000000
Percentage of AmortizationOfDebtDiscountPremium100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:ConvertibleNotes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value12121212121211111416161717
Percentage of AmortizationOfDebtDiscountPremium1200.01200.00.01200.01200.01512.51685.71450.02071.42328.62112.52471.42457.1

us-gaap:AmortizationOfFinancingCostsAndDiscounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value141515141414151317
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value4343434445424345464645414341424342424242434835232222149788
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value51-15312092922-291-349-21356381-284212200352-341-271
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommunicationsAndInformationTechnology



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value787971706555575860564744393736353232282725252424231816131010108886544
Percentage of CommunicationsAndInformationTechnology100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

bkng:Onlineaccommodationreservationservices, us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.850.880.870.840.880.86
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentConvertibleThresholdConsecutiveTradingDays1

srt:Maximum, bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value30.0
Percentage of DebtInstrumentConvertibleThresholdConsecutiveTradingDays1100.0

srt:Minimum, bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value20.0
Percentage of DebtInstrumentConvertibleThresholdConsecutiveTradingDays166.7

us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateDuringPeriod

bkng:ConvertibleNotes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.0320.00.0320.0320.0320.00.0320.0320.0330.00.0340.00100000000000000090.034
Percentage of DebtInstrumentInterestRateDuringPeriod100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DepreciationAmortizationAndAccretionNet



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value117117119116107107103
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value117117117119116108107106103979585837978777270696765715740383526191615151313131212109
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-2118-18-6-2-3-16-31100304621-522
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate



Period End2020-03-312018-12-312018-09-302011-06-302011-03-312010-06-302010-03-31
Value0.210.00.00.350.350.350.35
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.00.00.0100.0100.0100.0100.0

us-gaap:IncomeTaxAuthority

us-gaap:TaxAndCustomsAdministrationNetherlands



Period End2020-03-312019-12-312019-09-302018-09-302018-06-302018-03-31
Value0.250.00.00.00.00.25
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate119.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-307326-4917451-474302155000
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bkng:MeituanDianping



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-8123111616491-256257
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss26.470.9-236.7964.720.254.0832.8

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount



Period End2020-03-312019-03-31
Value1000
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount100.00.0

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments



Period End2020-03-312019-03-31
Value-23-13
Percentage of GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments100.0100.0

us-gaap:GoodwillImpairmentLoss



Period End2020-03-312019-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-30
Value489000094000
Percentage of GoodwillImpairmentLoss100.00.00.00.00.0100.00.00.0

us-gaap:ReportingUnit

bkng:OpenTableAndKAYAK



Period End2020-03-31
Value489
Percentage of GoodwillImpairmentLoss100.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-7221420236312079686312240120875394020668635277627976924606161456648407552130571541661131614031816580
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-760-119-8149924-1315829596-20914525578-186126152191-2201167120-1714021894115585620
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOperatingLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value-1135-314-719952561-369-32369763146-232567305-10-161375311-25-213204201-5-10316514718815317723
Percentage of IncreaseDecreaseInOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value44516-337-856690-373-134708-12-302-5443-109-182-53340-5-213729213-228-53317207145-3-1
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value00000000000000000000000001110100000013
Percentage of IncrementalCommonSharesAttributableToConversionOfDebtSecurities0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value00000000000000000000000000000000001111
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value68507033686354267444502138384334033621026259330
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value3239443435454846474641
Percentage of InvestmentIncomeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value48456256661950148453652249843948338535136134733230831230528925827425922119418616513413510810094948575826249
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketingExpense



Period End2020-03-312019-03-31
Value8511193
Percentage of MarketingExpense100.0100.0

us-gaap:Range, us-gaap:DebtInstrument, us-gaap:HedgingDesignation

us-gaap:NotionalAmountOfNonderivativeInstruments

srt:Maximum, bkng:EuroDenominatedDebt, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-30
Value320000
Percentage of NotionalAmountOfNonderivativeInstruments100.00.00.0

srt:Minimum, bkng:EuroDenominatedDebt, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-30
Value21000-1000
Percentage of NotionalAmountOfNonderivativeInstruments65.60.00.0

us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentForeignCurrencyTranslation



Period End2020-03-312019-03-31
Value-128-80
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentNetInvestmentHedges



Period End2020-03-312019-03-31
Value6276
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent-48.4-95.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-94211
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent73.4-263.8

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent



Period End2020-03-312019-03-31
Value-154148
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-77160
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent50.0108.1

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-77-12
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent50.0-8.1

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-74210-45159-60-133-40-424-31186345-322173-112-24466-134124162
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-74210-45159-60-133-50-424-31186345-322173-112-24
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.00.0100.0100.0100.0100.0103.6100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentForeignCurrencyTranslation



Period End2020-03-312019-03-31
Value411
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentNetInvestmentHedges



Period End2020-03-312019-03-31
Value-15-19
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-375.0-172.7

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value17-51
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax425.0-463.6

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentForeignCurrencyTranslation



Period End2020-03-312019-03-31
Value-128-80
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentNetInvestmentHedges



Period End2020-03-312019-03-31
Value6276
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent-48.4-95.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-90210
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent70.3-262.5

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent



Period End2020-03-312019-03-31
Value-151147
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-74159
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent49.0108.2

us-gaap:AccumulatedTranslationAdjustment



Period End2020-03-312019-03-31
Value-77-12
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent51.0-8.2

us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentForeignCurrencyTranslation



Period End2020-03-312019-03-31
Value411
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1100.0100.0

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentNetInvestmentHedges



Period End2020-03-312019-03-31
Value-15-19
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1-375.0-172.7

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value16-51
Percentage of OtherComprehensiveIncomeLossTaxPortionAttributableToParent1400.0-463.6

us-gaap:OtherNoncashExpense



Period End2020-03-312019-03-31
Value27
Percentage of OtherNoncashExpense100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value119114251119841103591669855199
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireMarketableSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value72116135445835645713246813711498
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value18859634312266599810152481991803676
Percentage of ProceedsFromSaleAndMaturityOfMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-30
Value00-371872502100-4
Percentage of ProceedsFromShortTermDebt0.00.0100.0100.0100.0100.0100.00.0100.0

us-gaap:ProvisionForDoubtfulAccounts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-312010-03-31
Value199-393434405446332819161213131696744986434321
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:ComponentofProvisionchargedtoearnings

bkng:ContractWithCustomerReductionToRevenueCancellationRefunds



Period End2020-03-31
Value48
Percentage of ProvisionForDoubtfulAccounts24.1

us-gaap:LossContingenciesByNatureOfContingency

bkng:COVID19



Period End2020-03-31
Value183
Percentage of ProvisionForDoubtfulAccounts92.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-41
Percentage of ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent



Period End2020-03-312019-03-31
Value-3000000.01000000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value-3000000.01000000.0
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0

us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-03-31
Value1000000.00.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.00.0

us-gaap:RepaymentsOfShortTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value000400250000
Percentage of RepaymentsOfShortTermDebt0.00.00.0100.0100.00.00.00.00.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

us-gaap:PerformanceShares



Period End2020-03-31
Value2989.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod100.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-31
Value5971.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod199.8

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:PerformanceShares



Period End2020-03-31
Value80266.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod100.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-31
Value109595.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod136.5

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares



Period End2020-03-31
Value1737.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-31
Value1808.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue104.1

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value77000.02965.04616.08714.070705.03835.04204.012664.059043.02931.03472.06078.044888.04973.02625.029108.090401.03386.05131.04270.053062.04259.0670.0555.072277.0110679.0136718.0346904.0
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value00000000000
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensationGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value020100011011123441639321701
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross0.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value020100011011123441639321701
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross0.0100.00.0100.00.0100.5100.0100.099.9100.0100.0100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.099.899.7

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value000000000000000000000000000
Percentage of StockIssuedDuringPeriodValueShareBasedCompensationGross0.00.00.00.00.0-0.50.00.00.10.00.00.00.10.00.00.00.00.00.00.00.00.00.00.10.00.20.3

us-gaap:TreasuryStockSharesAcquired



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value00011110000000
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareRepurchaseProgram

bkng:CommonStockRepurchaseProgram



Period End2020-03-312019-03-31
Value01
Percentage of TreasuryStockSharesAcquired88.695.6

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value00011110000000000
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.299.7100.199.90.00.00.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value12511341135026062856181222481199731700586343212271198299259753117385330850414809676254157
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareRepurchaseProgram

bkng:CommonStockRepurchaseProgram



Period End2020-03-312019-03-31
Value11222735
Percentage of TreasuryStockValueAcquiredCostMethod89.795.8

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-03-31
Value12511341135026062856183122481199731700586343212271198299259753117385330850414809676254157
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0101.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:ConvertibleDebtEquity



Period End2020-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value40004551228
Percentage of ConvertibleDebtEquity100.00.00.00.0100.0100.0100.0100.0

bkng:ConvertibleDebtLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value99598898297596800948941710967
Percentage of ConvertibleDebtLiability100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

bkng:DeferredMerchantBookings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-012017-12-312016-12-31
Value96015611567234317971022110118021425778980614
Percentage of DeferredMerchantBookings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

bkng:EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:EquitySecurities, bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value5226843
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType

bkng:Trip.comGroup, us-gaap:EquitySecurities, us-gaap:ShortTermInvestments



Period End2020-03-31
Value0
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax0.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

bkng:EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:EquitySecurities, bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value6872
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType

bkng:Trip.comGroup, us-gaap:EquitySecurities, us-gaap:ShortTermInvestments



Period End2020-03-31
Value117
Percentage of EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax1950.0

us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:MeasurementInputType

bkng:Fairvaluemeasurementinputsnumber

srt:Maximum, bkng:GrabandDidiChuxing, us-gaap:MeasurementInputEbitdaMultiple



Period End2020-03-31
Value15.0
Percentage of Fairvaluemeasurementinputsnumber100.0

srt:Minimum, bkng:GrabandDidiChuxing, us-gaap:MeasurementInputEbitdaMultiple



Period End2020-03-31
Value13.0
Percentage of Fairvaluemeasurementinputsnumber86.7

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:MeasurementInputType

bkng:GrabandDidiChuxing, us-gaap:MeasurementInputExpectedTerm



Period End2020-03-31
Value4.0
Percentage of Fairvaluemeasurementinputsnumber26.7

us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:MeasurementInputType

bkng:Fairvaluemeasurementinputspercentages

srt:Maximum, bkng:GrabandDidiChuxing, bkng:MeasurementInputWeightedAverageCostOfCapital



Period End2020-03-31
Value0.14
Percentage of Fairvaluemeasurementinputspercentages100.0

srt:Maximum, bkng:GrabandDidiChuxing, us-gaap:MeasurementInputPriceVolatility



Period End2020-03-31
Value0.7
Percentage of Fairvaluemeasurementinputspercentages500.0

srt:Minimum, bkng:GrabandDidiChuxing, bkng:MeasurementInputWeightedAverageCostOfCapital



Period End2020-03-31
Value0.12
Percentage of Fairvaluemeasurementinputspercentages85.7

srt:Minimum, bkng:GrabandDidiChuxing, us-gaap:MeasurementInputPriceVolatility



Period End2020-03-31
Value0.6
Percentage of Fairvaluemeasurementinputspercentages428.6

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:ValuationTechnique

bkng:Fairvaluemeasurementinputsvaluationapproachallocation

bkng:Grab, us-gaap:IncomeApproachValuationTechnique



Period End2020-03-31
Value0.75
Percentage of Fairvaluemeasurementinputsvaluationapproachallocation100.0

bkng:Grab, us-gaap:MarketApproachValuationTechnique



Period End2020-03-31
Value0.25
Percentage of Fairvaluemeasurementinputsvaluationapproachallocation33.3

us-gaap:InvestmentType

bkng:Longterminvestmentcost

bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value173738108622
Percentage of Longterminvestmentcost100.0100.0100.0

us-gaap:InvestmentType

bkng:Longterminvestmentgrossunrealizedgain

bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value52268610
Percentage of Longterminvestmentgrossunrealizedgain100.0100.0100.0

us-gaap:InvestmentType

bkng:Longterminvestmentgrossunrealizedloss

bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value20319224
Percentage of Longterminvestmentgrossunrealizedloss100.0100.0100.0

us-gaap:InvestmentType

bkng:MarketableSecuritiesCost

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value945998975155619873674417341634259
Percentage of MarketableSecuritiesCost100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

bkng:MarketableSecuritiesGrossUnrealizedGain

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value010010000
Percentage of MarketableSecuritiesGrossUnrealizedGain0.0100.00.00.0100.00.0100.0100.0100.0

us-gaap:InvestmentType

bkng:MarketableSecuritiesGrossUnrealizedLosses

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value119123714151719
Percentage of MarketableSecuritiesGrossUnrealizedLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0

bkng:PrepaidExpenseAllowanceForCreditLoss



Period End2020-03-312019-12-31
Value546
Percentage of PrepaidExpenseAllowanceForCreditLoss100.0100.0

us-gaap:BalanceSheetLocation

us-gaap:OtherNoncurrentAssets



Period End2020-03-312019-12-31
Value490
Percentage of PrepaidExpenseAllowanceForCreditLoss90.70.0

us-gaap:PrepaidExpensesAndOtherCurrentAssets



Period End2020-03-312019-12-31
Value56
Percentage of PrepaidExpenseAllowanceForCreditLoss9.3100.0

us-gaap:AccountsAndOtherReceivablesNetCurrent



Period End2020-03-312019-12-312018-12-31
Value66716801523
Percentage of AccountsAndOtherReceivablesNetCurrent100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

bkng:MarketingReceivables



Period End2020-03-312019-12-31
Value61110
Percentage of AccountsAndOtherReceivablesNetCurrent9.16.5

us-gaap:TradeAccountsReceivable



Period End2020-03-312019-12-31
Value7401200
Percentage of AccountsAndOtherReceivablesNetCurrent110.971.4

us-gaap:AllowanceForDoubtfulAccountsReceivable



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value245494961392515141410
Percentage of AllowanceForDoubtfulAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value245495256616155474339353127252117191517221514131414141211111087766556582
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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us-gaap:AociBeforeTaxAttributableToParent

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-53-53-53-53-53-53-52-52-52-52-52-52-52-52-52-52-52-52
Percentage of AociBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentForeignCurrencyTranslation



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value-314-186-189-109210-460
Percentage of AociBeforeTaxAttributableToParent592.5350.9356.6205.7-399.2874.5

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentNetInvestmentHedges



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value60-23-73-290258
Percentage of AociBeforeTaxAttributableToParent-113.23.8-5.7137.7551.3-490.5

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value-97-753-157343711734539185529354460456
Percentage of AociBeforeTaxAttributableToParent183.013.2-100.0296.2-652.5-1352.7-1396.8-1026.0-353.4-1007.2-674.1-876.0-867.1

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us-gaap:AociTaxAttributableToParent

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentForeignCurrencyTranslation



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value5854524100
Percentage of AociTaxAttributableToParent100.0100.0100.0100.00.00.0

bkng:AccumulatedForeignCurrencyAdjustmentAttributableToParentNetInvestmentHedges



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value-20-5-71265-110
Percentage of AociTaxAttributableToParent-34.5-9.3-13.529.30.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss



Period End2020-03-312019-12-312019-03-312018-12-312017-12-312016-12-31
Value-29-45-81-30-90-9
Percentage of AociTaxAttributableToParent-50.0-83.3-155.8-73.20.00.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:CorporateDebtSecurities, us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value01001000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.0100.00.00.0100.00.0100.0100.0

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Period End2020-03-31
Value0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.0

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

bkng:Debtsecuritiesprivatecompanies, bkng:LongtermInvestments



Period End2020-03-312019-12-31
Value200
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.00.0

us-gaap:CorporateDebtSecurities, us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value01126121113
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.00.00.00.00.00.00.00.0

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Period End2020-03-31
Value20
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0

bkng:Trip.comGroup, us-gaap:ForeignCorporateDebtSecurities, bkng:LongtermInvestments



Period End2020-03-312019-12-312019-09-302018-12-31
Value7783498
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax385.00.00.00.0

bkng:Trip.comGroup, us-gaap:ForeignCorporateDebtSecurities, us-gaap:ShortTermInvestments



Period End2020-03-31
Value2
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax10.0

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us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

bkng:LongtermInvestments



Period End2020-03-312019-12-31
Value7752192
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-31
Value414998
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis53.445.5

us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CorporateDebtSecurities, us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1647517047021519269329522837
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis21.234.30.00.00.00.00.00.0

us-gaap:RedeemableConvertiblePreferredStock, bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value250250200
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis32.311.40.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType

bkng:Trip.comGroup, us-gaap:ForeignCorporateDebtSecurities, bkng:LongtermInvestments



Period End2020-03-312019-12-312019-09-302018-12-31
Value5257757751275
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis67.735.40.00.0

bkng:Trip.comGroup, us-gaap:ForeignCorporateDebtSecurities, us-gaap:ShortTermInvestments



Period End2020-03-31
Value250
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis32.3

bkng:Trip.comGroup1NoteDue2020, us-gaap:ForeignCorporateDebtSecurities, us-gaap:ShortTermInvestments



Period End2020-03-31
Value250
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis32.3

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Period End2020-03-312019-12-31
Value230250
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0

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Period End2020-03-312019-12-31
Value230250
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1647517037001514268129402823
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Period End2020-03-312019-12-312018-12-31
Value230250200
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.00.0

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Period End2020-03-31
Value180
Percentage of AvailableForSaleSecuritiesDebtSecurities78.3

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Period End2020-03-312019-12-31
Value180200
Percentage of AvailableForSaleSecuritiesDebtSecurities78.380.0

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Period End2020-03-312019-12-312019-09-302018-12-31
Value4487677411177
Percentage of AvailableForSaleSecuritiesDebtSecurities194.8306.80.00.0

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Period End2020-03-31
Value248
Percentage of AvailableForSaleSecuritiesDebtSecurities107.8

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us-gaap:ContractualObligation

bkng:Headquarters, bkng:Booking.com



Period End2020-03-312019-12-312019-09-302019-06-302016-09-30
Value102109124139270
Percentage of ContractualObligation100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-30
Value71717272
Percentage of ContractualObligation69.665.158.151.8

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Period End2020-05-07
Value93
Percentage of ContractualObligation0.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-03-312010-12-312009-12-31
Value761577117588777177118787885578788111900389337777751064006590755666336489573257285648421042632042210221602574257415741574157415751575575575195
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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bkng:A0.8SeniorNotesDueMarch2022



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1097112310901139112311431161116712291200
Percentage of DebtInstrumentCarryingAmount14.414.614.414.714.613.013.114.815.213.3

bkng:A1.8SeniorNotesDueMarch2027



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10971123109011391123114311611167122912001054
Percentage of DebtInstrumentCarryingAmount14.414.614.414.714.613.013.114.815.213.316.5

bkng:A2.15SeniorNotesDueNovember2022



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value824842818854842858871875922900791
Percentage of DebtInstrumentCarryingAmount10.810.910.811.010.99.89.811.111.410.012.4

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10971123109011391123114311611167122912001054
Percentage of DebtInstrumentCarryingAmount14.414.614.414.714.613.013.114.815.213.316.5

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bkng:A4.1SeniorConvertibleNotesDueApril2025, us-gaap:SubsequentEvent



Period End2020-04-30
Value1000
Percentage of DebtInstrumentCarryingAmount0.0

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Period End2020-04-30
Value750
Percentage of DebtInstrumentCarryingAmount0.0

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Period End2020-04-30
Value1500
Percentage of DebtInstrumentCarryingAmount0.0

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Period End2020-04-30
Value1886.44
Percentage of DebtInstrumentConvertibleConversionPrice1100.0

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us-gaap:DebtInstrumentFaceAmount

bkng:A0.75SeniorConvertibleNotesDueMay2025Member, us-gaap:SubsequentEvent



Period End2020-04-30
Value863
Percentage of DebtInstrumentFaceAmount100.0

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us-gaap:DebtInstrumentFairValue

us-gaap:FairValueInputsLevel2



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value8700980097009800950093009600970010100111001150010400101008400
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value6271768592138151113121193206212224-230243301312330
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument

bkng:A0.8SeniorNotesDueMarch2022



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3344455556
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet4.84.25.34.74.33.63.34.84.93.2

bkng:A0.9SeniorConvertibleNotesDueSeptember2021



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value33394450566166727783104
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet53.254.957.958.860.944.244.163.664.143.1-45.5

bkng:A1.8SeniorNotesDueMarch2027



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value45444444555
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet6.57.05.34.74.32.93.14.34.12.7-2.5

bkng:A2.15SeniorNotesDueNovember2022



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value23333434445
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet3.24.23.93.53.32.92.63.73.72.4-2.3

bkng:A2.375SeniorNotesDueSeptember2024Member



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value8981010101011111212
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet12.912.710.511.810.97.27.19.89.96.3-5.6

bkng:A2.75SeniorNotesDueMarch2023



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2222332233
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet3.22.82.62.43.32.21.82.52.51.7

bkng:A3.55SeniorNotesDueMarch2028



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3333333333
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet4.84.23.93.53.32.22.12.92.81.8

bkng:A3.65SeniorNotesDueMarch2025



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value22333323333
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet3.22.83.93.53.32.22.02.72.61.7-1.6

bkng:A3.6SeniorNotesDueJune2026



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value55566666667
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet8.17.06.67.16.54.34.15.75.53.5-3.3

us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

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Period End2020-03-312019-12-31
Value512
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet8.116.9

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-012017-12-312017-09-302017-06-302016-12-31
Value786876868504513370491502481483481407397822
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312018-12-31
Value144117701324
Percentage of DerivativeNotionalAmount100.0100.0100.0

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Period End2020-03-312019-12-312018-12-31
Value950901921
Percentage of DerivativeNotionalAmount65.950.969.6

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us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecurities, bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value97717931036
Percentage of EquitySecuritiesFvNi100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bkng:MeituanDianping



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value9721100822706451
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us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument, us-gaap:InvestmentType

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Period End2020-03-31
Value414
Percentage of EquitySecuritiesFvNi42.4

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us-gaap:EquitySecuritiesFvNiCost

us-gaap:EquitySecurities, bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value46111171105
Percentage of EquitySecuritiesFvNiCost100.0100.0100.0

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bkng:Trip.comGroup, us-gaap:EquitySecurities, us-gaap:ShortTermInvestments



Period End2020-03-31
Value531
Percentage of EquitySecuritiesFvNiCost115.2

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us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount

bkng:EquitysecuritiesprivatecompaniesMember, bkng:LongtermInvestments



Period End2020-03-312019-12-312018-12-31
Value401501501
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount100.0100.0100.0

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Period End2020-03-31
Value400
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount99.8

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Period End2020-03-312018-12-31
Value400500
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount99.899.8

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us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount

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Period End2020-03-312019-12-31
Value1000
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount100.00.0

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Period End2020-03-312019-12-312018-12-31
Value2150
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.00.0

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us-gaap:ForwardContracts, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated



Period End2020-03-312019-12-31
Value215
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value119811691117108810421001964944916861811759704657630588555506469429377355316297274250231199183200188177175162157157147133108
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value478472446440422408396382377355335312287270267254246227218206186188180179170160148132124122114107105979392857660
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization39.940.439.940.440.540.841.140.541.241.241.341.140.941.242.543.244.445.046.648.049.453.057.060.562.164.064.166.567.961.360.860.560.259.859.258.758.357.655.7

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value323230313030292930282728262525232320191816161615131210753211000002
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization2.72.72.72.82.93.03.13.13.33.33.43.83.73.84.04.14.24.14.24.34.44.85.15.35.14.84.43.83.21.91.51.10.70.40.30.20.10.12.4

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Period End2020-03-312019-12-312019-09-302019-06-302018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
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us-gaap:TechnologyBasedIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
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Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization46.345.745.544.744.443.943.341.840.940.740.340.040.139.738.537.836.736.234.833.431.928.424.921.420.218.918.216.415.514.114.013.713.313.012.612.011.611.37.4

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
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Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsByMajorClass

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10831100108311001095109910811084106810561050825812809822822831824826829819842813582582581576563259269264259267260264278274264204
Percentage of FiniteLivedIntangibleAssetsGross35.035.234.935.235.135.235.134.935.034.834.730.830.630.530.830.831.030.930.931.030.831.332.645.745.845.845.445.169.465.969.469.469.471.871.871.972.172.472.7

us-gaap:InternetDomainNames



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value394039414041404143424143403942414240383837414346464544423839181718554316
Percentage of FiniteLivedIntangibleAssetsGross1.31.31.31.31.31.31.31.31.41.41.41.61.51.51.61.61.61.51.51.51.41.51.73.73.63.63.53.410.39.74.94.84.81.41.41.20.90.52.3

us-gaap:OtherIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value2222300000000000000000000000
Percentage of FiniteLivedIntangibleAssetsGross0.10.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.1

us-gaap:TechnologyBasedIntangibleAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value169170174176173173171171137137136112
Percentage of FiniteLivedIntangibleAssetsGross5.55.45.65.65.55.55.65.54.54.54.54.2

us-gaap:TradeNames



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value180218111804181018101810178517861783177917771669166716671669166916711671167216721671167415255485485485505475153535253525255545326
Percentage of FiniteLivedIntangibleAssetsGross58.258.058.257.858.057.957.957.558.358.558.762.462.862.962.562.562.362.562.662.562.862.261.243.143.143.143.343.813.713.213.913.913.914.414.414.414.414.59.6

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss



Period End2020-03-312019-12-31
Value1400941
Percentage of GoodwillImpairedAccumulatedImpairmentLoss100.0100.0

us-gaap:LettersOfCreditOutstandingAmount



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value5555554333333332223344222111111111
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossContingenciesByNatureOfContingency

us-gaap:LossContingencyAccrualAtCarryingValue

bkng:TaxesOwedForPriorPeriods



Period End2020-03-312019-12-31
Value7567
Percentage of LossContingencyAccrualAtCarryingValue100.0100.0

us-gaap:MarketableSecuritiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value8269989731553198136604158414542404859
Percentage of MarketableSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentType

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value826998973155319813660415841454240
Percentage of MarketableSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation

us-gaap:PrepaidExpenseCurrentAndNoncurrent

us-gaap:OtherNoncurrentAssets



Period End2020-03-31
Value126
Percentage of PrepaidExpenseCurrentAndNoncurrent100.0

us-gaap:PrepaidExpensesAndOtherCurrentAssets



Period End2020-03-312019-12-31
Value104232
Percentage of PrepaidExpenseCurrentAndNoncurrent82.50.0

us-gaap:AwardDate, us-gaap:AwardType, us-gaap:ContingentConsiderationByType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

bkng:PerformanceShareUnits2018Grants, us-gaap:PerformanceShares, bkng:Maximumnumberofsharesthatcouldbeissued



Period End2020-03-312019-12-31
Value00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0

bkng:PerformanceShareUnits2018Grants, us-gaap:PerformanceShares, bkng:Sharesnotsubjecttoachieveminimumperformancethreshold



Period End2020-03-312019-12-31
Value00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber35.836.2

bkng:PerformanceShareUnits2018Grants, us-gaap:PerformanceShares, bkng:Sharesprobablytobeissued



Period End2020-03-312019-12-31
Value00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber36.393.2

bkng:PerformanceShareUnits2019Grants, us-gaap:PerformanceShares, bkng:Maximumnumberofsharesthatcouldbeissued



Period End2020-03-312019-12-31
Value00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber147.1147.5

bkng:PerformanceShareUnits2019Grants, us-gaap:PerformanceShares, bkng:Sharesnotsubjecttoachieveminimumperformancethreshold



Period End2020-03-312019-12-31
Value00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber56.857.4

bkng:PerformanceShareUnits2019Grants, us-gaap:PerformanceShares, bkng:Sharesprobablytobeissued



Period End2020-03-312019-12-31
Value00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber56.873.8

us-gaap:AwardType

us-gaap:PerformanceShares



Period End2020-03-312019-12-312018-12-312017-12-312016-12-31
Value00000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber93.1263.10.00.00.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-12-312018-12-312017-12-312016-12-31
Value00000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber367.9312.60.00.00.0

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares



Period End2020-03-312019-12-312018-12-312017-12-312016-12-31
Value1841.01835.01659.01386.01288.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU



Period End2020-03-312019-12-312018-12-312017-12-312016-12-31
Value1762.01801.01783.01503.01300.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue95.798.1107.5108.4100.9

us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:EmployeeStockOption



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value13243938353643454740485462535753667980869811111642
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:ShortTermDebtType

us-gaap:ShortTermBorrowings

bkng:A0.35SeniorConvertibleNotesDueJune2020, us-gaap:ShortTermDebt



Period End2020-03-312019-12-31
Value995988
Percentage of ShortTermBorrowings100.0100.0

us-gaap:ShareRepurchaseProgram

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

bkng:A2019ShareRepurchaseProgram



Period End2020-03-312019-12-31
Value1040011500
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0100.0

us-gaap:TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302018-12-31
Value1021102110271166
Percentage of TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent100.0100.0100.0100.0

us-gaap:TreasuryStockShares



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value222121201817161514141313131313121212111010999999888888777776
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents


us-gaap:Revenues us-gaap:StatementGeographical


us-gaap:Revenues us-gaap:ProductOrService


us-gaap:InterestExpenseDebt us-gaap:DebtInstrument


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass


us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:BalanceSheetLocation, bkng:ContractLiabilityType, bkng:CustomerIncentiveProgram


us-gaap:LongTermDebt us-gaap:DebtInstrument


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:SubsequentEventType