GOODWILL AND INTANGIBLES - Goodwill (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020
Goodwill [Roll Forward]
Beginning Balance	$ 2,817,000,000	$ 2,817,000,000	$ 2,892,000,000	$ 2,892,000,000
Impairment	0	0	(73,000,000)
Foreign exchange adjustments	0	0	(2,000,000)
Ending Balance	2,817,000,000	2,817,000,000	2,817,000,000	2,817,000,000
Vacation Ownership
Goodwill [Roll Forward]
Beginning Balance	2,445,000,000	2,445,000,000	2,445,000,000	2,445,000,000
Impairment	0	0	0	0
Foreign exchange adjustments	0	0	0
Ending Balance	2,445,000,000	2,445,000,000	2,445,000,000	2,445,000,000
Exchange & Third-Party Management
Goodwill [Roll Forward]
Beginning Balance	372,000,000	372,000,000	447,000,000	447,000,000
Impairment	0	0	(73,000,000)
Foreign exchange adjustments	0	0	(2,000,000)
Ending Balance	$ 372,000,000	$ 372,000,000	$ 372,000,000	$ 372,000,000