REVENUE AND RECEIVABLES - Schedule of Sources of Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,228	$ 1,156	$ 2,393	$ 2,268
Cost reimbursements	400	407	830	780
Financing	92	90	184	178
TOTAL REVENUES	1,320	1,246	2,577	2,446
Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	430	370	773	725
Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	76	141	142
Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	58	56	115	113
Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92	87	185	179
Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	225	219	441	434
Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	160	349	329
Operating segments
Disaggregation of Revenue [Line Items]
TOTAL REVENUES	1,314	1,241	2,564	2,434
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	5	13	12
Cost reimbursements	(11)	(8)	(20)	(15)
Financing	0	0	0	0
TOTAL REVENUES	6	5	13	12
Corporate and Other \| Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate and Other \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate and Other \| Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	(1)	(1)
Corporate and Other \| Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	13	34	28
Corporate and Other \| Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	13	33	27
Corporate and Other \| Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Vacation Ownership \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,168	1,098	2,269	2,145
Cost reimbursements	407	413	842	791
Financing	92	90	184	178
TOTAL REVENUES	1,260	1,188	2,453	2,323
Vacation Ownership \| Operating segments \| Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	430	370	773	725
Vacation Ownership \| Operating segments \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74	75	139	140
Vacation Ownership \| Operating segments \| Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56	55	112	110
Vacation Ownership \| Operating segments \| Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36	35	71	70
Vacation Ownership \| Operating segments \| Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	166	165	322	320
Vacation Ownership \| Operating segments \| Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	165	150	332	309
Exchange & Third-Party Management \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	54	53	111	111
Cost reimbursements	4	2	8	4
Financing	0	0	0	0
TOTAL REVENUES	54	53	111	111
Exchange & Third-Party Management \| Operating segments \| Sale of vacation ownership products
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Exchange & Third-Party Management \| Operating segments \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1	2	2
Exchange & Third-Party Management \| Operating segments \| Management fee revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	1	4	4
Exchange & Third-Party Management \| Operating segments \| Exchange and other services revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39	39	80	81
Exchange & Third-Party Management \| Operating segments \| Management and exchange
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42	41	86	87
Exchange & Third-Party Management \| Operating segments \| Rental
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 8	$ 10	$ 17	$ 20