Severance Indemnities and Pension Plans (Summary for Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Domestic, Japan | Pension benefits and SIPs | ||
| Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets: | ||
| Projected benefit obligations | ¥ 21,544 | ¥ 21,768 |
| Accumulated benefit obligations | 21,336 | 21,768 |
| Fair value of plan assets | 5,762 | 5,304 |
| Foreign offices and subsidiaries | Pension benefits and other benefits | ||
| Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets: | ||
| Projected benefit obligations | 97,923 | 93,518 |
| Accumulated benefit obligations | 72,918 | 67,399 |
| Fair value of plan assets | ¥ 10,101 | ¥ 8,275 |