Franchising, Marketing and Reservation Activities - Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Franchisors [Abstract] | ||
| Payments of development advance notes | $ (61) | $ (53) |
| Proceeds from repayment of development advance notes | 4 | 2 |
| Payments of development advance notes, net | $ (57) | $ (51) |