REVENUE AND RECEIVABLES - Schedule of Sources of Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,165	$ 1,112
Cost reimbursements	430	373
Financing	92	88
TOTAL REVENUES	1,257	1,200
Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	343	355
Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	66	66
Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	57
Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	93	92
Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	216	215
Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	176	169
Operating segments
Disaggregation of Revenue [Line Items]
TOTAL REVENUES	1,250	1,193
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	7
Cost reimbursements	(9)	(7)
Financing	0	0
TOTAL REVENUES	7	7
Corporate and Other \| Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate and Other \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate and Other \| Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	(1)
Corporate and Other \| Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	15
Corporate and Other \| Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	14
Corporate and Other \| Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Vacation Ownership \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,101	1,047
Cost reimbursements	435	378
Financing	92	88
TOTAL REVENUES	1,193	1,135
Vacation Ownership \| Operating segments \| Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	343	355
Vacation Ownership \| Operating segments \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	65	65
Vacation Ownership \| Operating segments \| Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56	55
Vacation Ownership \| Operating segments \| Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	35	35
Vacation Ownership \| Operating segments \| Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	156	155
Vacation Ownership \| Operating segments \| Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	167	159
Exchange & Third-Party Management \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	58
Cost reimbursements	4	2
Financing	0	0
TOTAL REVENUES	57	58
Exchange & Third-Party Management \| Operating segments \| Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Exchange & Third-Party Management \| Operating segments \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1
Exchange & Third-Party Management \| Operating segments \| Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	3
Exchange & Third-Party Management \| Operating segments \| Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41	42
Exchange & Third-Party Management \| Operating segments \| Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44	46
Exchange & Third-Party Management \| Operating segments \| Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 9	$ 10