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SECURITIZED DEBT - Vacation Ownership Notes Receivable Securitizations (Details) - USD ($)	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Securitized Debt	$ 1,751,000,000		$ 1,871,000,000
Secured debt, net	1,751,000,000		1,871,000,000
Debt, stated interest rate		6.125%
2020, remaining	2,000,000
2021	9,000,000
2022	239,000,000
2023	9,000,000
2024	9,000,000
Thereafter	2,449,000,000
Debt \| Warehouse Credit Facility \| Variable interest entity
Debt Instrument [Line Items]
Securitized Debt	0		21,000,000
Unamortized debt issuance costs	(1,000,000)		(2,000,000)
Secured debt, net	0		19,000,000
Debt \| Other
Debt Instrument [Line Items]
Secured debt, net	0		20,000,000
Variable interest entity
Debt Instrument [Line Items]
Securitized Debt	1,769,000,000		1,871,000,000
Variable interest entity \| Debt
Debt Instrument [Line Items]
Securitized Debt	$ 1,769,000,000
Debt, weighted average interest rate	2.70%
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%
Vacation Ownership Notes Receivable Securitizations \| Debt \| Variable interest entity
Debt Instrument [Line Items]
Securitized Debt	$ 1,769,000,000		1,850,000,000
Unamortized debt discount and issuance costs	(18,000,000)		(18,000,000)
Secured debt, net	1,751,000,000		$ 1,832,000,000
Vacation Ownership Notes Receivable Securitizations \| Variable interest entity \| Debt
Debt Instrument [Line Items]
Securitized Debt	1,769,000,000
2020, remaining	46,000,000
2021	178,000,000
2022	184,000,000
2023	189,000,000
2024	191,000,000
Thereafter	981,000,000
Long-term debt	$ 1,769,000,000