Derivative Financial Instruments (Notional Amounts of Derivative Contracts) (Detail) - JPY (¥) ¥ in Trillions |
Mar. 31, 2022 |
Mar. 31, 2021 |
|---|---|---|
| Derivative [Line Items] | ||
| Total | ¥ 1,657.3 | ¥ 1,551.8 |
| Interest rate contracts | ||
| Derivative [Line Items] | ||
| Total | 1,391.8 | 1,308.4 |
| Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Total | 245.0 | 222.0 |
| Equity contracts | ||
| Derivative [Line Items] | ||
| Total | 7.4 | 8.0 |
| Commodity contracts | ||
| Derivative [Line Items] | ||
| Total | 0.1 | 0.1 |
| Credit derivatives | ||
| Derivative [Line Items] | ||
| Total | 9.8 | 9.8 |
| Other | ||
| Derivative [Line Items] | ||
| Total | ¥ 3.2 | ¥ 3.5 |