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REVENUE - Impact of COVID-19 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |  |
(Increase) reduction in revenue for refunds paid or estimated to be payable due to the Impact of COVID-19 | $ (21) | $ 42

X
- Definition Amount of reduction (increase) to revenue for refunds paid or estimated to be payable to travelers to provide free cancellation for certain non-refundable reservations without a corresponding estimated expected recovery from the travel service provider. + References No definition available. + Details
Name: | bkng_ContractWithCustomerReductionIncreaseToRevenueForRefundsPaidOrEstimatedToBePayableToTravelers
Namespace Prefix: | bkng_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration