FAIR VALUE MEASUREMENTS - Notional Amount of Foreign Currency Exchange Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Losses) gains on foreign currency exchange derivatives	$ (44)	$ 130	$ 10	$ (32)
Foreign currency exchange derivatives \| Not Designated as Hedging Instrument \| Foreign currency purchases
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	9,600		9,600		$ 8,200
Foreign currency exchange derivatives \| Not Designated as Hedging Instrument \| Foreign currency sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 5,400		$ 5,400		$ 5,500

- 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 + Details

Booking Holdings Inc. 10-Q