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TIMESHARE FINANCING RECEIVABLES - Schedule of Timeshare Financing Receivables (Details) $ in Millions, ¥ in Billions	Sep. 30, 2025 USD ($)	Aug. 31, 2025 USD ($)	Jul. 31, 2025 USD ($)	Jul. 31, 2025 JPY (¥)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, net	$ 3,059					$ 3,006
Originated
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross	3,443					2,932
Unamortized non-credit acquisition premium	0					0
Less: allowance for financing receivables losses	(967)					(804)	$ (722)	$ (500)
Timeshare financing receivables, net	2,476					2,128
Acquired
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross	712					1,084
Unamortized non-credit acquisition premium	39					62
Less: allowance for financing receivables losses	(168)					(268)	$ (338)	$ (279)
Timeshare financing receivables, net	583					878
Securitized
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross		$ 400	$ 65	¥ 9.5	$ 300
Securitized | Originated
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross	1,557					1,168
Securitized | Acquired
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross	399					641
Unsecuritized | Originated
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross	1,886					1,764
Unsecuritized | Acquired
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables, gross	$ 313					$ 443

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