VACATION OWNERSHIP NOTES RECEIVABLE - Financing Receivable Year of Originated (Details) - Legacy-MVW - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	$ 174
2019	491
2018	318
2017	187
2016	88
2015 and Prior	163
Total vacation ownership notes receivable	1,421	$ 1,570
Non-Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	84
2019	72
2018	40
2017	20
2016	10
2015 and Prior	34
Total vacation ownership notes receivable	260	272
Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	90
2019	419
2018	278
2017	167
2016	78
2015 and Prior	129
Total vacation ownership notes receivable	$ 1,161	$ 1,298