GOODWILL - Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Beginning balance	$ 2,817,000,000	$ 2,892,000,000
Impairment	0	(73,000,000)
Foreign exchange adjustments		(2,000,000)
Welk Acquisition	299,000,000
Measurement period adjustments	34,000,000
Ending balance	3,150,000,000	2,817,000,000
Vacation Ownership
Goodwill [Roll Forward]
Beginning balance	2,445,000,000	2,445,000,000
Impairment		0
Foreign exchange adjustments		0
Welk Acquisition	299,000,000
Measurement period adjustments	34,000,000
Ending balance	2,778,000,000	2,445,000,000
Exchange & Third-Party Management
Goodwill [Roll Forward]
Beginning balance	372,000,000	447,000,000
Impairment		(73,000,000)
Foreign exchange adjustments		(2,000,000)
Welk Acquisition	0
Measurement period adjustments	0
Ending balance	$ 372,000,000	$ 372,000,000