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COMMITMENTS AND CONTINGENCIES - Other Contractual Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Letters of credit outstanding | $ 650 | $ 533
Partner liability insurance maximum | $ 1 |

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- Definition PartnerLiabilityInsuranceMaximum + References No definition available. + Details
Name: | bkng_PartnerLiabilityInsuranceMaximum
Namespace Prefix: | bkng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant