VARIABLE INTEREST ENTITIES - Classifications of Consolidated VIE Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 2,014	$ 2,233
Interest receivable	15	16
Restricted Cash and Cash Equivalents	341	414
TOTAL ASSETS	9,117	9,214
Securitized Debt	1,887	1,871
TOTAL LIABILITIES	6,397	6,183
Variable interest entity
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	1,797	1,750
Restricted Cash and Cash Equivalents	73	64
TOTAL ASSETS	1,884
Securitized Debt	1,886	$ 1,871
TOTAL LIABILITIES	1,888
Variable interest entity | Debt
Variable Interest Entity [Line Items]
Securitized Debt	1,886
Variable interest entity | Vacation ownership notes receivable, net of reserves
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	1,797
Variable interest entity | Interest receivable
Variable Interest Entity [Line Items]
Interest receivable	14
Variable interest entity | Restricted cash
Variable Interest Entity [Line Items]
Restricted Cash and Cash Equivalents	73
Variable interest entity | Interest payable
Variable Interest Entity [Line Items]
Interest payable	2
Variable interest entity | Vacation Ownership Notes Receivable Securitizations
Variable Interest Entity [Line Items]
TOTAL ASSETS	1,543
TOTAL LIABILITIES	1,580
Variable interest entity | Vacation Ownership Notes Receivable Securitizations | Debt
Variable Interest Entity [Line Items]
Securitized Debt	1,578
Variable interest entity | Vacation Ownership Notes Receivable Securitizations | Vacation ownership notes receivable, net of reserves
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	1,472
Variable interest entity | Vacation Ownership Notes Receivable Securitizations | Interest receivable
Variable Interest Entity [Line Items]
Interest receivable	11
Variable interest entity | Vacation Ownership Notes Receivable Securitizations | Restricted cash
Variable Interest Entity [Line Items]
Restricted Cash and Cash Equivalents	60
Variable interest entity | Vacation Ownership Notes Receivable Securitizations | Interest payable
Variable Interest Entity [Line Items]
Interest payable	2
Variable interest entity | Warehouse Credit Facility
Variable Interest Entity [Line Items]
TOTAL ASSETS	341
TOTAL LIABILITIES	308
Variable interest entity | Warehouse Credit Facility | Debt
Variable Interest Entity [Line Items]
Securitized Debt	308
Variable interest entity | Warehouse Credit Facility | Vacation ownership notes receivable, net of reserves
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	325
Variable interest entity | Warehouse Credit Facility | Interest receivable
Variable Interest Entity [Line Items]
Interest receivable	3
Variable interest entity | Warehouse Credit Facility | Restricted cash
Variable Interest Entity [Line Items]
Restricted Cash and Cash Equivalents	13
Variable interest entity | Warehouse Credit Facility | Interest payable
Variable Interest Entity [Line Items]
Interest payable	$ 0