Revenue Recognition Revenue Recognition (Disaggregation of Net Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,101	$ 1,044	$ 3,125	$ 2,996
Corporate and other
Disaggregation of Revenue [Line Items]
Net revenues	(2)	(1)	(4)	(4)
Corporate and other \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Net revenues	0	1	1	2
Corporate and other \| Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(2)	(2)	(5)	(6)
Vacation Ownership \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	953	876	2,658	2,486
Vacation Ownership \| Operating Segments \| Vacation Ownership Interest Sales
Disaggregation of Revenue [Line Items]
Net revenues	545	494	1,497	1,352
Vacation Ownership \| Operating Segments \| Property management fees and reimbursable revenues
Disaggregation of Revenue [Line Items]
Net revenues	248	218	701	657
Vacation Ownership \| Operating Segments \| Consumer financing
Disaggregation of Revenue [Line Items]
Net revenues	118	115	344	339
Vacation Ownership \| Operating Segments \| Fee-for-Service commissions
Disaggregation of Revenue [Line Items]
Net revenues	12	22	33	64
Vacation Ownership \| Operating Segments \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Net revenues	30	27	83	74
Travel and Membership \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	150	169	471	514
Travel and Membership \| Operating Segments \| Ancillary revenues
Disaggregation of Revenue [Line Items]
Net revenues	7	7	18	20
Travel and Membership \| Operating Segments \| Transaction revenues
Disaggregation of Revenue [Line Items]
Net revenues	102	119	328	365
Travel and Membership \| Operating Segments \| Subscription revenues
Disaggregation of Revenue [Line Items]
Net revenues	$ 41	$ 43	$ 125	$ 129