VACATION OWNERSHIP NOTES RECEIVABLE - Legacy-ILG Vacation Ownership Notes Receivable (Details) - Legacy-ILG - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	$ 118	$ 78
Current	736	789
Total vacation ownership notes receivable	854	867
Non-Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	76	51
Current	73	250
Total vacation ownership notes receivable	149	301
Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	42	27
Current	663	539
Total vacation ownership notes receivable	705	566
31 – 90 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	33	29
31 – 90 days past due | Non-Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	8	11
31 – 90 days past due | Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	25	18
91 – 150 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	13	9
91 – 150 days past due | Non-Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	4	3
91 – 150 days past due | Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	9	6
Greater than 120 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	72	40
Greater than 120 days past due | Non-Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	64	37
Greater than 120 days past due | Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total past due	8	3
Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total vacation ownership notes receivable	$ 429	$ 428