VACATION OWNERSHIP NOTES RECEIVABLE - Notes Receivable Reserves (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Originated
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	$ 204
Increase in vacation ownership notes receivable reserve	71
Securitizations	0
Write-offs	(12)
Defaulted vacation ownership notes receivable repurchase activity	0
Ending balance	263
Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	0
Increase in vacation ownership notes receivable reserve	13
Write-offs	(9)
Recoveries	(4)
Ending balance	63
Non-Securitized Vacation Ownership Notes Receivable | Originated
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	90
Increase in vacation ownership notes receivable reserve	36
Securitizations	(16)
Write-offs	(12)
Defaulted vacation ownership notes receivable repurchase activity	15
Ending balance	113
Non-Securitized Vacation Ownership Notes Receivable | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	0
Increase in vacation ownership notes receivable reserve	5
Write-offs	(9)
Recoveries	(4)
Ending balance	29
Securitized Vacation Ownership Notes Receivable | Originated
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	114
Increase in vacation ownership notes receivable reserve	35
Securitizations	16
Write-offs	0
Defaulted vacation ownership notes receivable repurchase activity	(15)
Ending balance	150
Securitized Vacation Ownership Notes Receivable | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	0
Increase in vacation ownership notes receivable reserve	8
Write-offs	0
Recoveries	0
Ending balance	34
Accounting Standards Update 2016-13 | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	55
Accounting Standards Update 2016-13 | Non-Securitized Vacation Ownership Notes Receivable | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	29
Accounting Standards Update 2016-13 | Securitized Vacation Ownership Notes Receivable | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Beginning balance	26
COVID-19 pandemic | Originated
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Increase in vacation ownership notes receivable reserve	42
COVID-19 pandemic | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Increase in vacation ownership notes receivable reserve	10
COVID-19 pandemic | Non-Securitized Vacation Ownership Notes Receivable | Originated
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Increase in vacation ownership notes receivable reserve	16
COVID-19 pandemic | Non-Securitized Vacation Ownership Notes Receivable | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Increase in vacation ownership notes receivable reserve	2
COVID-19 pandemic | Securitized Vacation Ownership Notes Receivable | Originated
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Increase in vacation ownership notes receivable reserve	26
COVID-19 pandemic | Securitized Vacation Ownership Notes Receivable | Acquired
Time Sharing Transactions, Allowance for Uncollectible Accounts [Roll Forward]
Increase in vacation ownership notes receivable reserve	$ 8