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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	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Disaggregation of Revenue [Line Items]
Sales of VOIs, net	$ 825	$ 637
Deferred Sales of VOIs
Disaggregation of Revenue [Line Items]
Sales of VOIs, net	485	460
Cost of VOI sales	135	133
Sales and marketing expense	$ 79	$ 74

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

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