Property, Plant and Equipment - Additional information (Detail) - Vehicles And Equipment On Operating Leases [Member] - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Right of use assets | ¥ 5,546,865 | ¥ 4,664,376 | |
| Additions to right-of-use assets | 2,654,403 | 2,909,058 | |
| Depreciation of right of use assets | 658,046 | 617,495 | ¥ 612,569 |
| Income from subleasing right-of-use assets | ¥ 1,101,911 | ¥ 1,008,634 | ¥ 947,058 |