Vehicle Rental Activities ( Schedule of Components of Vehicle Depreciation and Lease Charges) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Property, Plant and Equipment [Abstract] | ||||
| Depreciation expense | $ 657 | $ 655 | $ 1,350 | $ 1,217 |
| Lease charges | 33 | 39 | 61 | 74 |
| (Gain) loss on sale of vehicles, net | (54) | 39 | 280 | 78 |
| Vehicle depreciation and lease charges, net | $ 636 | $ 733 | 1,691 | $ 1,369 |
| Other fleet charges | $ 390 | |||