ACQUISITIONS AND DISPOSITIONS - Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		9 Months Ended
	Sep. 01, 2018	Sep. 30, 2019	Dec. 31, 2018
September 1, 2018 (as reported at December 31, 2018)
Goodwill		$ 2,890	$ 2,828
Adjustments
Adjustments		62
September 1, 2018 (as adjusted at September 30, 2019)
Goodwill		2,890	$ 2,828
ILG
September 1, 2018 (as reported at December 31, 2018)
Vacation ownership notes receivable	$ 753
Inventory	484
Property and equipment	385
Intangible assets	1,145
Other assets	704
Deferred revenue	(291)
Deferred taxes	(138)
Debt	(392)
Securitized debt from VIEs	(718)
Other liabilities	(605)
Net assets acquired	1,327
Goodwill	2,890
Assets acquired	4,217	4,217
Adjustments
Vacation ownership notes receivable	0
Inventory	10
Property and equipment	11
Intangible assets	(21)
Other assets	84
Deferred revenue	(74)
Deferred taxes	41
Debt	0
Securitized debt from VIEs	(16)
Other liabilities	(94)
Net assets acquired	(59)
Adjustments	62
Assets acquired	3
September 1, 2018 (as adjusted at September 30, 2019)
Vacation ownership notes receivable	753
Inventory	484
Property and equipment	385
Intangible assets	1,145
Other assets	704
Deferred revenue	(291)
Deferred taxes	(138)
Debt	(392)
Securitized debt from VIEs	(718)
Other liabilities	(605)
Net assets acquired	1,327
Goodwill	2,890
Assets acquired	4,217	$ 4,217
Previously Reported | ILG
September 1, 2018 (as reported at December 31, 2018)
Vacation ownership notes receivable	753
Inventory	474
Property and equipment	374
Intangible assets	1,166
Other assets	620
Deferred revenue	(217)
Deferred taxes	(179)
Debt	(392)
Securitized debt from VIEs	(702)
Other liabilities	(511)
Net assets acquired	1,386
Goodwill	2,828
Assets acquired	4,214
September 1, 2018 (as adjusted at September 30, 2019)
Vacation ownership notes receivable	753
Inventory	474
Property and equipment	374
Intangible assets	1,166
Other assets	620
Deferred revenue	(217)
Deferred taxes	(179)
Debt	(392)
Securitized debt from VIEs	(702)
Other liabilities	(511)
Net assets acquired	1,386
Goodwill	2,828
Assets acquired	$ 4,214