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ACQUISITIONS AND DISPOSITIONS - Acquisitions Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 04, 2026 USD ($) vacation_ownership_unit	Sep. 30, 2026 USD ($) vacation_ownership_unit	Sep. 30, 2025 USD ($) vacation_ownership_unit	Jun. 30, 2025 USD ($) vacation_ownership_unit
Bali, Indonesia
Asset Acquisition [Line Items]
Number of vacation ownership units acquired \| vacation_ownership_unit		32
Asset acquisition, consideration transferred		$ 17
Payments for asset acquisitions		11
Reclassification of previous deposits associated with the project from other assets to inventory		$ 6
Khao Lak, Thailand
Asset Acquisition [Line Items]
Number of vacation ownership units acquired \| vacation_ownership_unit				52
Asset acquisition, consideration transferred				$ 50
Payments for asset acquisitions				43
Reclassification of previous deposits associated with the project from other assets to property and equipment				$ 7
Waikiki Hawaii
Asset Acquisition [Line Items]
Number of vacation ownership units acquired \| vacation_ownership_unit			48
Asset acquisition, consideration transferred			$ 82
Payments for asset acquisitions			80
Inventory			$ 2
Waikiki Hawaii \| Subsequent event
Asset Acquisition [Line Items]
Number of vacation ownership units acquired \| vacation_ownership_unit	24
Asset acquisition, consideration transferred	$ 41