VACATION OWNERSHIP NOTES RECEIVABLE - Future Principal Payments, Net of Reserves, and Interest Rates of Vacation Ownership Notes Receivable (Details) $ in Millions	Mar. 31, 2020 USD ($)
Acquired
Future Minimum Payments Receivable [Line Items]
2020, remaining	$ 37
2021	49
2022	49
2023	48
2024	47
Thereafter	161
Total Vacation ownership notes receivable, net of reserve	391
Acquired | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2020, remaining	3
2021	4
2022	4
2023	4
2024	4
Thereafter	16
Total Vacation ownership notes receivable, net of reserve	35
Acquired | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2020, remaining	34
2021	45
2022	45
2023	44
2024	43
Thereafter	145
Total Vacation ownership notes receivable, net of reserve	$ 356
Acquired | Weighted Average
Future Minimum Payments Receivable [Line Items]
Interest rates	13.40%
Acquired | Weighted Average | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	13.40%
Acquired | Weighted Average | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	13.40%
Acquired | Minimum
Future Minimum Payments Receivable [Line Items]
Interest rates	3.00%
Acquired | Minimum | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	3.00%
Acquired | Minimum | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	6.00%
Acquired | Maximum
Future Minimum Payments Receivable [Line Items]
Interest rates	17.90%
Acquired | Maximum | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	17.90%
Acquired | Maximum | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	16.90%
Originated
Future Minimum Payments Receivable [Line Items]
2020, remaining	$ 134
2021	173
2022	173
2023	173
2024	173
Thereafter	942
Total Vacation ownership notes receivable, net of reserve	1,768
Originated | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2020, remaining	30
2021	32
2022	28
2023	25
2024	24
Thereafter	163
Total Vacation ownership notes receivable, net of reserve	302
Originated | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2020, remaining	104
2021	141
2022	145
2023	148
2024	149
Thereafter	779
Total Vacation ownership notes receivable, net of reserve	$ 1,466
Originated | Weighted Average
Future Minimum Payments Receivable [Line Items]
Interest rates	12.60%
Originated | Weighted Average | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	12.30%
Originated | Weighted Average | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	12.60%
Originated | Minimum
Future Minimum Payments Receivable [Line Items]
Interest rates	0.00%
Originated | Minimum | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	0.00%
Originated | Minimum | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	0.00%
Originated | Maximum
Future Minimum Payments Receivable [Line Items]
Interest rates	18.00%
Originated | Maximum | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	18.00%
Originated | Maximum | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	17.50%