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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	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Disaggregation Of Revenue [Line Items]
Sales of VOIs, net	$ 635	$ 252
Deferred Sales of VOIs
Disaggregation Of Revenue [Line Items]
Sales of VOIs, net	399	92
Cost of VOI sales	114	28
Sales and marketing expense	$ 64	$ 13

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Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent.

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