Financial Risk Management - Disaggregation of Structured Finance Loans and Advances (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of credit risk exposure [line items] | ||
| Loans and advances | ¥ 130,516,241 | ¥ 125,190,819 |
| Gross carrying amount [member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Loans and advances | 132,356,223 | 126,824,274 |
| Gross carrying amount [member] | Real estate finance [member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Loans and advances | 7,073,251 | 6,235,358 |
| Gross carrying amount [member] | Project finance [member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Loans and advances | 7,627,299 | 7,028,222 |
| Gross carrying amount [member] | Other structured finance [Member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Loans and advances | 513,656 | 532,616 |
| Gross carrying amount [member] | Structured finance [member] | ||
| Disclosure of credit risk exposure [line items] | ||
| Loans and advances | ¥ 15,214,206 | ¥ 13,796,196 |