Related-Party Transactions - Transactions with Key Management Personnel and Their Close Family Members (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Assets: | ||
| Loans and advances | ¥ 130,516,241 | ¥ 125,190,819 |
| Liabilities: | ||
| Deposits | 201,930,427 | 190,022,742 |
| Others | 16,767,384 | 10,821,441 |
| Key management personnel of entity or parent [member] | ||
| Assets: | ||
| Loans and advances | 442 | 734 |
| Liabilities: | ||
| Deposits | 2,482 | 2,680 |
| Others | ¥ 55 | ¥ 156 |