Revenue Recognition (Prop Mgmt Rev) (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026 USD ($) numberOfAssociations	Sep. 30, 2025 USD ($) numberOfAssociations	Sep. 30, 2026 USD ($) numberOfAssociations	Sep. 30, 2025 USD ($) numberOfAssociations
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,101	$ 1,044	$ 3,125	$ 2,996
Vacation Ownership \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	953	876	2,658	2,486
Management fee revenues \| Vacation Ownership
Disaggregation of Revenue [Line Items]
Net revenues	127	113	360	340
Reimbursable revenues \| Vacation Ownership
Disaggregation of Revenue [Line Items]
Net revenues	121	105	341	317
Property management fees and reimbursable revenues \| Vacation Ownership \| Operating Segments
Disaggregation of Revenue [Line Items]
Net revenues	248	218	701	657
Exchange-related revenue \| Vacation Ownership
Disaggregation of Revenue [Line Items]
Net revenues	$ 9	$ 8	$ 26	$ 26
Managed property owner's associations that paid travel and membership exchange fees \| numberOfAssociations	1	1	1	1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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