SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vacation Ownership Notes Receivable Reserve (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivable, noncredit discount	$ 2
Legacy MVW
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Period in which loan considered past due	30 days
Period in which loan suspend accrual of interest	90 days
Period in which loan considered default loan	150 days
ILG, Inc And Welk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Period in which loan considered default loan	120 days