BUSINESS SEGMENTS - Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 1,195	$ 1,169
Revenues excluding reimbursed costs	804	804
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues excluding reimbursed costs	699	700
All other countries
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues excluding reimbursed costs	105	104
Operating segments
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	1,195	1,168
Operating segments | Vacation Ownership
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	1,130	1,097
Operating segments | Exchange & Third-Party Management
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	65	71
Consolidated Property Owners’ Associations
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 0	$ 1