SECURITIZED DEBT - Vacation Ownership Notes Receivable Securitizations (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Securitized Debt	$ 1,887	$ 1,871
Secured debt, net	$ 1,887	1,871
Debt, stated interest rate	6.125%
2020, remaining	$ 4
2021	9
2022	239
2023	9
2024	9
Thereafter	2,449
Debt
Debt Instrument [Line Items]
2020, remaining	97
2021	193
2022	197
2023	442
2024	178
Thereafter	797
Long-term debt	1,904
Debt | Warehouse Credit Facility | Variable interest entity
Debt Instrument [Line Items]
Securitized Debt	308	21
Unamortized debt issuance costs	(2)	(2)
Secured debt, net	$ 306	19
Debt, interest rate, effective percentage	2.10%
Debt | Other
Debt Instrument [Line Items]
Secured debt, net	$ 18	20
2020, remaining	1
2021	2
2022	2
2023	2
2024	2
Thereafter	9
Long-term debt	18
Variable interest entity
Debt Instrument [Line Items]
Securitized Debt	1,886	1,871
Variable interest entity | Debt
Debt Instrument [Line Items]
Securitized Debt	$ 1,886
Debt, weighted average interest rate	2.90%
Variable interest entity | Debt | Minimum
Debt Instrument [Line Items]
Debt, stated interest rate	2.20%
Variable interest entity | Debt | Maximum
Debt Instrument [Line Items]
Debt, stated interest rate	4.40%
Variable interest entity | Debt | Warehouse Credit Facility
Debt Instrument [Line Items]
2020, remaining	$ 9
2021	18
2022	20
2023	261
2024	0
Thereafter	0
Long-term debt	308
Vacation Ownership Notes Receivable Securitizations | Debt | Variable interest entity
Debt Instrument [Line Items]
Securitized Debt	1,578	1,850
Unamortized debt discount and issuance costs	(15)	(18)
Secured debt, net	1,563	$ 1,832
Vacation Ownership Notes Receivable Securitizations | Variable interest entity | Debt
Debt Instrument [Line Items]
Securitized Debt	1,578
2020, remaining	87
2021	173
2022	175
2023	179
2024	176
Thereafter	788
Long-term debt	$ 1,578