VARIABLE INTEREST ENTITIES - Cash Flows Between Company and Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Vacation Ownership Notes Receivable Securitizations
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	$ 445	$ 419
Principal receipts	355	227
Interest receipts	156	92
Reserve release	107	109
Total	1,063	847
Cash Outflows
Principal to investors	(379)	(208)
Voluntary repurchases of defaulted vacation ownership notes receivable	(35)	(34)
Voluntary clean-up call	(19)	(22)
Interest to investors	(36)	(19)
Funding of restricted cash	(93)	(117)
Total	(562)	(400)
Net Cash Flows	501	447
Warehouse Credit Facility
Cash Inflows
Net proceeds from vacation ownership notes receivable securitizations	181	0
Principal receipts	14	0
Interest receipts	13	0
Reserve release	1	0
Total	209	0
Cash Outflows
Principal to investors	(12)	0
Repayment of Warehouse Credit Facility	(228)	0
Interest to investors	(4)	(1)
Funding of restricted cash	(1)	0
Total	(245)	(1)
Net Cash Flows	$ (36)	$ (1)