ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS - Summary of the Activity of the Allowance for Expected Credit Losses on Prepayments to Customers (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Contract With Customer, Asset, Prepayments To Customers, Allowance for Credit Loss [Abstract]
Balance, beginning of year	$ 47	$ 55	$ 6
Provision charged to expense	(20)	(4)	51
Write-offs and adjustments	(4)	(5)	(2)
Currency translation adjustments	0	1	0
Balance, end of period	$ 23	$ 47	$ 55

Contract With Customer, Asset, Prepayments To Customers, Allowance for Credit Loss

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Contract With Customer, Asset, Prepayments To Customers, Foreign currency translation adjustments

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Contract With Customer, Asset, Prepayments To Customers, Allowance for Credit Loss

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Contract With Customer, Asset, Prepayments To Customers, Provision Charged To Expense

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Contract With Customer, Asset, Prepayments To Customers, Write-Offs

No definition available.

Name:	bkng_ContractWithCustomerAssetPrepaymentsToCustomersWriteOffs
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration