VARIABLE INTEREST ENTITIES - Cash Flows Between Company and Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Vacation Ownership Notes Receivable Securitizations
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	$ 0	$ 445
Principal receipts	232	237
Interest receipts	107	101
Reserve release	0	99
Total	339	882
Cash Outflows
Principal to investors	(238)	(233)
Voluntary repurchases of defaulted vacation ownership notes receivable	(35)	(23)
Interest to investors	(25)	(22)
Funding of restricted cash	0	(93)
Total	(298)	(371)
Net Cash Flows	41	511
Warehouse Credit Facility
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	315	124
Principal receipts	32	12
Interest receipts	14	12
Reserve release	0	2
Total	361	150
Cash Outflows
Principal to investors	(27)	(12)
Voluntary repurchases of defaulted vacation ownership notes receivable	(2)	0
Repayment of Warehouse Credit Facility	0	(228)
Interest to investors	(3)	(4)
Funding of restricted cash	(1)	(1)
Total	(33)	(245)
Net Cash Flows	$ 328	$ (95)