VACATION OWNERSHIP NOTES RECEIVABLE - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) credit_score	Dec. 31, 2018 USD ($) credit_score
Accounts, Notes, Loans and Financing Receivable [Line Items]
Vacation ownership notes receivable, net	$ 2,168	$ 2,039
Period in which loan considered past due	30 days
Period in which loan suspend accrual of interest	90 days
Period in which loan considered default loan	150 days
Notes receivable estimated average remaining default rates	7.00%	7.01%
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	$ 7	$ 7
Weighted average FICO score within originated loan pool | credit_score	711	710
Average estimated rate of default for all outstanding loans	12.47%	12.37%
Acquired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Vacation ownership notes receivable, net	$ 487	$ 651
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	$ 1