Vehicle Rental Activities - Schedule of Components of Vehicles (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Property, Plant, and Equipment [Abstract] | ||
| Rental vehicles | $ 22,057 | $ 21,011 |
| Less: Accumulated depreciation | (2,846) | (2,859) |
| Rental vehicles net, total | 19,211 | 18,152 |
| Vehicles held for sale | 207 | 432 |
| Vehicle, net investment in lease | 171 | 136 |
| Vehicles, net | $ 19,589 | $ 18,720 |