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SECURITIZED DEBT - Additional Information (Details)	3 Months Ended		9 Months Ended
SECURITIZED DEBT - Additional Information (Details)	Jun. 30, 2021 USD ($) class	Mar. 31, 2021	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Number of notes receivable pools under performance triggers \| loan			0
Number of notes receivable pools out of compliance \| loan			0
Number of notes receivable pools outstanding \| loan			13
Values of vacation ownership notes receivable that were purchased by trust during the period	$ 434,000,000
Vacation ownership notes number of classes \| class	4
Payment of debt issuance costs	$ (8,000,000)		$ (17,000,000)	$ (14,000,000)
Secured debt, net			1,594,000,000		$ 1,588,000,000
Warehouse Credit Facility
Debt Instrument [Line Items]
Credit facility					$ 350,000,000
Warehouse Credit Facility \| LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate	1.35%	1.10%
Secured Debt \| MVW 2021-1W LLC
Debt Instrument [Line Items]
Proceeds from vacation ownership notes receivable securitizations	$ 425,000,000
Debt, stated interest rate	1.52%
Secured Debt \| MVW 2021-1W LLC \| Class A Notes
Debt Instrument [Line Items]
Proceeds from vacation ownership notes receivable securitizations	$ 207,000,000
Debt, stated interest rate	1.14%
Secured Debt \| MVW 2021-1W LLC \| Class B Notes
Debt Instrument [Line Items]
Proceeds from vacation ownership notes receivable securitizations	$ 107,000,000
Debt, stated interest rate	1.44%
Secured Debt \| MVW 2021-1W LLC \| Class C Notes
Debt Instrument [Line Items]
Proceeds from vacation ownership notes receivable securitizations	$ 80,000,000
Debt, stated interest rate	1.94%
Secured Debt \| MVW 2021-1W LLC \| Class D Notes
Debt Instrument [Line Items]
Proceeds from vacation ownership notes receivable securitizations	$ 31,000,000
Debt, stated interest rate	3.17%
Secured Debt \| Warehouse Credit Facility \| Variable interest entity
Debt Instrument [Line Items]
Secured debt, net			$ 0