VACATION OWNERSHIP NOTES RECEIVABLE - Additional Information (Details) $ in Millions		3 Months Ended
	Jan. 01, 2020 USD ($)	Mar. 31, 2020 USD ($) credit_score	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) credit_score
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss, percentage increase		50.00%
Allowance for credit loss, percentage increase, period		15 months
Allowance, purchased with credit deterioration, increase	$ 2
Notes receivable estimated average remaining default rates		8.89%		7.04%
Estimated default rate increases that would have resulted an increase in allowance for credit losses		0.50%
Financing receivable, allowance for credit losses, that would have been increased		$ 8		$ 8
Average estimated rate of default for all outstanding loans		17.00%		12.65%
Weighted average FICO score within originated loan pool | credit_score		711		712
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in vacation ownership notes receivable reserve		$ (71)
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in vacation ownership notes receivable reserve		$ (13)
Estimated default rate increases that would have resulted an increase in allowance for credit losses		0.50%
Financing receivable, allowance for credit losses, that would have been increased		$ 2		$ 2
COVID-19 pandemic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss, period increase		52
COVID-19 pandemic | Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in vacation ownership notes receivable reserve		(42)
COVID-19 pandemic | Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in vacation ownership notes receivable reserve		(10)
Sale of vacation ownership products
Accounts, Notes, Loans and Financing Receivable [Line Items]
Expenses		60	$ 78
Sale of vacation ownership products | COVID-19 pandemic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Expenses		$ 15