TIMESHARE FINANCING RECEIVABLES - Schedule of Past Due Financing Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026	Apr. 30, 2026	Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	$ 5,022			$ 4,314
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	4,209			3,631
Current \| Elara Acquisition
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	406
31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	112			101
31 - 90 days past due \| Elara Acquisition
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	11
91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	43			40
91 - 120 days past due \| Elara Acquisition
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	3
121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	658			542
121 days and greater past due \| Elara Acquisition
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	65
Securitized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross		$ 300	$ 500
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	4,128			3,665
Originated \| Securitized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	1,948			1,734
Originated \| Securitized \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	1,866			1,667
Originated \| Securitized \| 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	50			45
Originated \| Securitized \| 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	21			16
Originated \| Securitized \| 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	11			6
Originated \| Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	2,180			1,931
Originated \| Unsecuritized \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	1,673			1,482
Originated \| Unsecuritized \| 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	42			41
Originated \| Unsecuritized \| 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	15			16
Originated \| Unsecuritized \| 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	450			392
Acquired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	894			649
Acquired \| Securitized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	524			373
Acquired \| Securitized \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	505			357
Acquired \| Securitized \| 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	13			9
Acquired \| Securitized \| 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	4			6
Acquired \| Securitized \| 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	2			1
Acquired \| Unsecuritized
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	370			276
Acquired \| Unsecuritized \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	165			125
Acquired \| Unsecuritized \| 31 - 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	7			6
Acquired \| Unsecuritized \| 91 - 120 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	3			2
Acquired \| Unsecuritized \| 121 days and greater past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Timeshare financing receivables, gross	$ 195			$ 143