Investment in Operating Leases - Schedule of Leased Vehicle Expenses (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Lessor, Lease, Description [Line Items] | ||
| End of term charges included in gain on disposition of vehicles (less than for the three months ended December 31, 2024) | $ 1 | $ 4 |
| Leased Vehicles | ||
| Lessor, Lease, Description [Line Items] | ||
| Depreciation expense | 1,164 | 1,058 |
| Initial direct costs and other lessor costs | 35 | 29 |
| Gain on disposition of leased vehicles | (19) | (30) |
| Total leased vehicle expenses, net | $ 1,180 | $ 1,057 |