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GOVERNMENT GRANTS AND OTHER ASSISTANCE (Details) - COVID-19 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 15 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Government Grant and Other Assistance Benefit Recognized |  |  | $ 131
Grants receivable |  |  | $ 28
Expense related to the return of government assistance | $ 137 | $ 137 |

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- Definition Expense related to the return of government assistance + References No definition available. + Details
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Namespace Prefix: | bkng_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Government Grant and Other Assistance Benefit Recognized + References No definition available. + Details
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Namespace Prefix: | bkng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |