VACATION OWNERSHIP NOTES RECEIVABLE - Notes Receivable Reserves (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	$ 140
Increase in vacation ownership notes receivable reserve	76
Securitizations	0
Clean-up call	0
Write-offs	(35)
Defaulted vacation ownership notes receivable repurchase activity	0
Ending balance	181
Non-Securitized Vacation Ownership Notes Receivable
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	61
Increase in vacation ownership notes receivable reserve	62
Securitizations	(47)
Clean-up call	19
Write-offs	(35)
Defaulted vacation ownership notes receivable repurchase activity	28
Ending balance	88
Securitized Vacation Ownership Notes Receivable
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	79
Increase in vacation ownership notes receivable reserve	14
Securitizations	47
Clean-up call	(19)
Write-offs	0
Defaulted vacation ownership notes receivable repurchase activity	(28)
Ending balance	$ 93