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ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Receivables [Abstract] |  |
Receivables from customers | $ 2,400 | $ 2,000
Receivables from payment processors and networks | 1,800 | 1,200
Prepayments to accommodation travel service provider customers | $ 78 | $ 49

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