Inventory (Narrative) (Details) - USD ($) $ in Millions |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Inventory [Line Items] | |||
| Inventory transferred (to)/from Property and Equipment | $ (36) | $ 8 | |
| Inventory transferred (to)/from Assets Held for Sale | (8) | ||
| Completed VOI inventory | 893 | $ 857 | |
| Contract with Customer, Right to Recover Product | 27 | ||
| Contract with Customer, Refund Liability | 25 | ||
| Maximum [Member] | Variable Interest Entity, Not Primary Beneficiary | |||
| Inventory [Line Items] | |||
| Inventory Sold Under Agreement to Repurchase, Repurchase Liability | 348 | ||
| Balance Sheet Location [Axis]: us-gaap:OtherAssets | |||
| Inventory [Line Items] | |||
| Completed VOI inventory | $ 24 | ||