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BASIS OF PRESENTATION - Additional Details (Details)	9 Months Ended
BASIS OF PRESENTATION - Additional Details (Details)	Sep. 30, 2020 USD ($) employee	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Percent of the assets, liabilities, revenues, expenses and cash flows discussed	100.00%
Cash and cash equivalents	$ 660,000,000	$ 287,000,000
Workforce Reduction Plan
Debt Instrument [Line Items]
Restructuring, workforce reduction \| employee	3,000
Maximum \| Workforce Reduction Plan
Debt Instrument [Line Items]
Restructuring reserve	$ 30,000,000
Minimum \| Workforce Reduction Plan
Debt Instrument [Line Items]
Restructuring reserve	$ 25,000,000
Exchange & Third-Party Management
Debt Instrument [Line Items]
Resorts open, percent	90.00%
Vacation Ownership
Debt Instrument [Line Items]
Resorts open, percent	95.00%
Sales centers open, percent	80.00%
Corporate credit facility \| Revolving corporate credit facility, net
Debt Instrument [Line Items]
Credit facility	$ 600,000,000
Corporate credit facility \| Revolving Corporate Credit Facility, net
Debt Instrument [Line Items]
Current borrowing capacity	$ 597,000,000