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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Deferred Revenue, Deferred Cost of VOI Sales and Deferred Direct Selling Costs from Sales of VOIs Related to Projects under Construction (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Disaggregation Of Revenue [Line Items] |  |
Sales of VOIs, net | $ 551 | $ 252
Deferred Sales of VOIs |  |
Disaggregation Of Revenue [Line Items] |  |
Sales of VOIs, net | 300 | 92
Cost of VOI sales | 89 | 28
Sales and marketing expense | $ 48 | $ 13

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