VARIABLE INTEREST ENTITIES - Classifications of Consolidated VIE Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 2,159	$ 2,233
Restricted cash	369	414
TOTAL ASSETS	9,432	9,214
Securitized debt, net	1,926	1,871
TOTAL LIABILITIES	6,660	6,183
Variable Interest Entity
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	1,822	1,750
Restricted cash	71	64
TOTAL ASSETS	1,906
Securitized debt, net	1,925	1,871
TOTAL LIABILITIES	1,927
Variable Interest Entity | Debt
Variable Interest Entity [Line Items]
Securitized debt, net	1,925
Variable Interest Entity | Vacation ownership notes receivable, net of reserves
Variable Interest Entity [Line Items]
Financing Receivable, after Allowance for Credit Loss	1,822
Variable Interest Entity | Interest receivable
Variable Interest Entity [Line Items]
Interest receivable	13
Variable Interest Entity | Restricted cash
Variable Interest Entity [Line Items]
Restricted cash	71
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	1,662
TOTAL LIABILITIES	1,708
Variable Interest Entity | Vacation Ownership Notes Receivable Securitizations | Debt
Variable Interest Entity [Line Items]
Securitized debt, net	1,706	$ 1,850
Variable Interest Entity | Vacation Ownership Notes Receivable Securitizations | Vacation ownership notes receivable, net of reserves
Variable Interest Entity [Line Items]
Restricted cash	1,589
Variable Interest Entity | Vacation Ownership Notes Receivable Securitizations | Interest receivable
Variable Interest Entity [Line Items]
Interest receivable	12
Variable Interest Entity | Vacation Ownership Notes Receivable Securitizations | Restricted cash
Variable Interest Entity [Line Items]
Restricted cash	61
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	244
TOTAL LIABILITIES	219
Variable Interest Entity | Warehouse Credit Facility | Debt
Variable Interest Entity [Line Items]
Securitized debt, net	219
Variable Interest Entity | Warehouse Credit Facility | Vacation ownership notes receivable, net of reserves
Variable Interest Entity [Line Items]
Restricted cash	233
Variable Interest Entity | Warehouse Credit Facility | Interest receivable
Variable Interest Entity [Line Items]
Interest receivable	1
Variable Interest Entity | Warehouse Credit Facility | Restricted cash
Variable Interest Entity [Line Items]
Restricted cash	10
Variable Interest Entity | Warehouse Credit Facility | Interest payable
Variable Interest Entity [Line Items]
Interest payable	$ 0