SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 51	$ 37	$ 37
Service-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	34	22	17
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	9	9	7
ILG Acquisition Converted RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	0	2	10
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	43	33	34
SARs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 8	$ 4	$ 3