VACATION OWNERSHIP NOTES RECEIVABLE - Aging of Recorded Investment in Principal, Vacation Ownership Notes Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Legacy MVW
Financing Receivable, Past Due
Total past due	$ 147	$ 94
Current	1,242	1,476
Total vacation ownership notes receivable	1,389	1,570
Legacy MVW | Non-securitized
Financing Receivable, Past Due
Total past due	108	50
Current	231	222
Total vacation ownership notes receivable	339	272
Legacy MVW | Securitized
Financing Receivable, Past Due
Total past due	39	44
Current	1,011	1,254
Total vacation ownership notes receivable	1,050	1,298
Legacy MVW | 31 – 90 days past due
Financing Receivable, Past Due
Total past due	33	40
Legacy MVW | 31 – 90 days past due | Non-securitized
Financing Receivable, Past Due
Total past due	8	7
Legacy MVW | 31 – 90 days past due | Securitized
Financing Receivable, Past Due
Total past due	25	33
Legacy MVW | 91 – 150 days past due
Financing Receivable, Past Due
Total past due	19	15
Legacy MVW | 91 – 150 days past due | Non-securitized
Financing Receivable, Past Due
Total past due	5	4
Legacy MVW | 91 – 150 days past due | Securitized
Financing Receivable, Past Due
Total past due	14	11
Legacy MVW | Greater than 150 days past due
Financing Receivable, Past Due
Total past due	95	39
Legacy MVW | Greater than 150 days past due | Non-securitized
Financing Receivable, Past Due
Total past due	95	39
Legacy MVW | Greater than 150 days past due | Securitized
Financing Receivable, Past Due
Total past due	0	0
Legacy ILG
Financing Receivable, Past Due
Total past due	148	78
Current	673	789
Total vacation ownership notes receivable	821	867
Legacy ILG | Non-securitized
Financing Receivable, Past Due
Total past due	117	51
Current	123	250
Total vacation ownership notes receivable	240	301
Legacy ILG | Securitized
Financing Receivable, Past Due
Total past due	31	27
Current	550	539
Total vacation ownership notes receivable	581	566
Legacy ILG | 31 – 90 days past due
Financing Receivable, Past Due
Total past due	27	29
Legacy ILG | 31 – 90 days past due | Non-securitized
Financing Receivable, Past Due
Total past due	8	11
Legacy ILG | 31 – 90 days past due | Securitized
Financing Receivable, Past Due
Total past due	19	18
Legacy ILG | 91 – 120 days past due
Financing Receivable, Past Due
Total past due	9	9
Legacy ILG | 91 – 120 days past due | Non-securitized
Financing Receivable, Past Due
Total past due	2	3
Legacy ILG | 91 – 120 days past due | Securitized
Financing Receivable, Past Due
Total past due	7	6
Legacy ILG | Greater than 120 days past due
Financing Receivable, Past Due
Total past due	112	40
Legacy ILG | Greater than 120 days past due | Non-securitized
Financing Receivable, Past Due
Total past due	107	37
Legacy ILG | Greater than 120 days past due | Securitized
Financing Receivable, Past Due
Total past due	$ 5	$ 3