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REVENUES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
REVENUES - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Online accommodation reservation services \| Revenue Benchmark \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	90.00%	89.00%	90.00%	89.00%
Concentration risk percentage	90.00%	89.00%	90.00%	89.00%
Incentives Programs \| Accrued expenses and other current liabilities
Disaggregation of Revenue [Line Items]
Liabilities for incentives granted to consumers	$ 133		$ 133		$ 149

- 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.

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