VARIABLE INTEREST ENTITIES - Cash Flows Between Company and Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Vacation Ownership Notes Receivable Securitizations
Cash Inflows
Principal receipts	$ 121	$ 119
Interest receipts	56	50
Reserve release	0	13
Total	177	182
Cash Outflows
Principal to investors	(129)	(119)
Voluntary repurchases of defaulted vacation ownership notes receivable	(15)	(9)
Interest to investors	(13)	(11)
Total	(157)	(139)
Net Cash Flows	20	43
Warehouse Credit Facility
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	202	124
Principal receipts	11	7
Interest receipts	4	7
Total	217	138
Cash Outflows
Principal to investors	(4)	(5)
Interest to investors	(1)	(2)
Funding of restricted cash	(1)	(1)
Total	(6)	(8)
Net Cash Flows	$ 211	$ 130