VACATION OWNERSHIP NOTES RECEIVABLE - Interest Income Associated With Vacation Ownership Notes Receivable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 69	$ 65
Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	63	59
Non-Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 6	$ 6