BUSINESS SEGMENTS - Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 9,613	$ 8,898
Fixed Assets	1,136	791
United States
Segment Reporting Information [Line Items]
Fixed Assets	988	640
All other countries
Segment Reporting Information [Line Items]
Fixed Assets	148	151
Operating Segments
Segment Reporting Information [Line Items]
Assets	8,808	7,810
Operating Segments | Vacation Ownership
Segment Reporting Information [Line Items]
Assets	7,897	6,859
Operating Segments | Exchange & Third-Party Management
Segment Reporting Information [Line Items]
Assets	911	951
Corporate and other
Segment Reporting Information [Line Items]
Assets	$ 805	$ 1,088