Investment in Operating Leases - Schedule of Leased Vehicle Expenses (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 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, 2025) | $ 2 | $ 1 | $ 3 | $ 7 |
| Leased Vehicles | ||||
| Lessor, Lease, Description [Line Items] | ||||
| Depreciation expense | 1,202 | 1,095 | 3,551 | 3,221 |
| Initial direct costs and other lessor costs | 29 | 24 | 102 | 89 |
| Gain on disposition of leased vehicles | (13) | (14) | (46) | (66) |
| Total leased vehicle expenses, net | $ 1,218 | $ 1,105 | $ 3,607 | $ 3,244 |