Severance Indemnities and Pension Plans (Summary for Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Domestic, Japan | Pension benefits and SIPs | ||
| Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets: | ||
| Projected benefit obligations | ¥ 21,768 | ¥ 24,655 |
| Accumulated benefit obligations | 21,768 | 24,655 |
| Fair value of plan assets | 5,304 | 7,771 |
| 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 | 93,518 | 94,145 |
| Accumulated benefit obligations | 67,399 | 66,949 |
| Fair value of plan assets | ¥ 8,275 | ¥ 9,708 |