VACATION OWNERSHIP NOTES RECEIVABLE - Aging of Recorded Investment in Principal, Vacation Ownership Notes Receivable (Details) - Legacy-MVW - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total past due	$ 79	$ 78
Current	1,432	1,325
Total vacation ownership notes receivable	1,511	1,403
Non-Securitized
Financing Receivable, Past Due [Line Items]
Total past due	49	43
Current	314	235
Total vacation ownership notes receivable	363	278
Securitized
Financing Receivable, Past Due [Line Items]
Total past due	30	35
Current	1,118	1,090
Total vacation ownership notes receivable	1,148	1,125
31 – 90 days past due
Financing Receivable, Past Due [Line Items]
Total past due	29	33
31 – 90 days past due | Non-Securitized
Financing Receivable, Past Due [Line Items]
Total past due	8	7
31 – 90 days past due | Securitized
Financing Receivable, Past Due [Line Items]
Total past due	21	26
91 – 150 days past due
Financing Receivable, Past Due [Line Items]
Total past due	12	12
91 – 150 days past due | Non-Securitized
Financing Receivable, Past Due [Line Items]
Total past due	3	3
91 – 150 days past due | Securitized
Financing Receivable, Past Due [Line Items]
Total past due	9	9
Greater than 150 days past due
Financing Receivable, Past Due [Line Items]
Total past due	38	33
Greater than 150 days past due | Non-Securitized
Financing Receivable, Past Due [Line Items]
Total past due	38	33
Greater than 150 days past due | Securitized
Financing Receivable, Past Due [Line Items]
Total past due	$ 0	$ 0