VACATION OWNERSHIP NOTES RECEIVABLE - Future Principal Payments, Net of Reserves, and Interest Rates of Vacation Ownership Notes Receivable (Details) $ in Millions	Sep. 30, 2019 USD ($)
Acquired
Future Minimum Payments Receivable [Line Items]
2019, remaining	$ 14
2020	55
2021	56
2022	57
2023	56
Thereafter	249
Total Vacation ownership notes receivable, net of reserve	487
Acquired | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2019, remaining	2
2020	6
2021	7
2022	7
2023	7
Thereafter	41
Total Vacation ownership notes receivable, net of reserve	70
Acquired | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2019, remaining	12
2020	49
2021	49
2022	50
2023	49
Thereafter	208
Total Vacation ownership notes receivable, net of reserve	$ 417
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	13.20%
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	3.50%
Acquired | Minimum | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	3.50%
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]
2019, remaining	$ 44
2020	170
2021	166
2022	166
2023	166
Thereafter	969
Total Vacation ownership notes receivable, net of reserve	1,681
Originated | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2019, remaining	18
2020	66
2021	53
2022	45
2023	41
Thereafter	289
Total Vacation ownership notes receivable, net of reserve	512
Originated | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2019, remaining	26
2020	104
2021	113
2022	121
2023	125
Thereafter	680
Total Vacation ownership notes receivable, net of reserve	$ 1,169
Originated | Weighted Average
Future Minimum Payments Receivable [Line Items]
Interest rates	12.50%
Originated | Weighted Average | Non-Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	12.10%
Originated | Weighted Average | Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Interest rates	12.70%
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	5.20%
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%