Franchising, Marketing and Reservation Activities - Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Franchisors [Abstract] | ||
| Payments of development advance notes | $ (80) | $ (77) |
| Proceeds from repayment of development advance notes | 5 | 4 |
| Payments of development advance notes, net | $ (75) | $ (73) |