VARIABLE INTEREST ENTITIES - Cash Flows Between Company and Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Vacation Ownership Notes Receivable Securitizations
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	$ 815	$ 419
Principal receipts	477	322
Interest receipts	214	145
Reserve release	184	168
Total	1,690	1,054
Cash Outflows
Principal to investors	(507)	(329)
Voluntary repurchases of defaulted vacation ownership notes receivable	(54)	(31)	$ (28)
Voluntary clean-up call	(22)	(22)
Interest to investors	(49)	(31)
Funding of restricted cash	(169)	(110)
Total	(801)	(523)
Net Cash Flows	889	531
Warehouse Credit Facility
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	202	116
Principal receipts	14	1
Interest receipts	13	1
Reserve release	2	0
Total	231	118
Cash Outflows
Principal to investors	(12)	0
Repayment of Warehouse Credit Facility	(285)	0
Interest to investors	(4)	(1)
Funding of restricted cash	(2)	(1)
Total	(303)	(2)
Net Cash Flows	$ (72)	$ 116