VARIABLE INTEREST ENTITIES - Interest Income and Expense Recognized as a Result of Our Involvement with Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Interest income	$ 259	$ 257	$ 264
Administrative expenses	227	$ 154	$ 248
Variable Interest Entity
Variable Interest Entity [Line Items]
Interest income	219
Interest expense to investors	45
Debt issuance cost amortization	8
Administrative expenses	3
Vacation Ownership Notes Receivable Securitizations | Variable Interest Entity
Variable Interest Entity [Line Items]
Interest income	217
Interest expense to investors	43
Debt issuance cost amortization	7
Administrative expenses	3
Warehouse Credit Facility | Variable Interest Entity
Variable Interest Entity [Line Items]
Interest income	2
Interest expense to investors	2
Debt issuance cost amortization	1
Administrative expenses	$ 0