VARIABLE INTEREST ENTITIES - Cash Flows Between Company and Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Vacation Ownership Notes Receivable Securitizations
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	$ 371	$ 445
Principal receipts	360	355
Interest receipts	166	156
Reserve release	16	107
Total	913	1,063
Cash Outflows
Principal to investors	(370)	(379)
Voluntary repurchases of defaulted vacation ownership notes receivable	(69)	(35)
Cash Flows Between Transferor and Transferee, Payment to Purchaser	(18)	(19)
Interest to investors	(37)	(36)
Funding of restricted cash	(20)	(93)
Total	(514)	(562)
Net Cash Flows	399	501
Warehouse Credit Facility
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	315	181
Principal receipts	34	14
Interest receipts	17	13
Reserve release	2	1
Total	368	209
Cash Outflows
Principal to investors	(33)	(12)
Voluntary repurchases of defaulted vacation ownership notes receivable	(3)	0
Repayment of Warehouse Credit Facility	(300)	(228)
Interest to investors	(4)	(4)
Funding of restricted cash	(2)	(1)
Total	(342)	(245)
Net Cash Flows	$ 26	$ (36)