Revenue Earning Vehicles - Schedule of Components of Revenue Earning Vehicles (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Long-Lived Assets Held-for-sale [Line Items] | ||
| Total revenue earning vehicles, net | $ 12,967 | $ 12,526 |
| Vehicles, Including Held-For-Sale | ||
| Long-Lived Assets Held-for-sale [Line Items] | ||
| Revenue earning vehicles | 14,548 | 13,848 |
| Less accumulated depreciation | (1,673) | (1,513) |
| Revenue earning vehicles less accumulated depreciation | 12,875 | 12,335 |
| Vehicles Held For Sale | ||
| Long-Lived Assets Held-for-sale [Line Items] | ||
| Revenue earning vehicles held for sale, net | $ 92 | $ 191 |