Segment Analysis - Reconciliation of Segmental Results of Operations to Consolidated Income Statements (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of operating segments [line items] | |||
| Consolidated net business profit | ¥ 2,330,900 | ¥ 1,719,300 | ¥ 1,560,200 |
| Others | 137,700 | (5,400) | 72,000 |
| Profit before tax | 1,555,030 | 654,246 | 1,207,789 |
| Reconciling management reporting under Japanese GAAP to IFRS [member] | |||
| Disclosure of operating segments [line items] | |||
| Total credit costs | (388,400) | (344,500) | (274,000) |
| Gains on equity instruments | 446,100 | 509,800 | 249,800 |
| Extraordinary gains or losses and others | (136,900) | (184,700) | (193,700) |
| Profit before tax under Japanese GAAP | 2,251,700 | 1,699,900 | 1,342,300 |
| Scope of consolidation | 8,400 | 8,100 | 7,400 |
| Derivative financial instruments | (286,400) | (417,900) | (111,600) |
| Investment securities | (418,100) | (601,900) | (43,400) |
| Loans and advances | (71,700) | (103,000) | 2,400 |
| Investments in associates and joint ventures | 80,200 | 14,000 | (20,200) |
| Property, plant and equipment | (1,500) | (2,200) | 22,700 |
| Lease accounting | (400) | (2,200) | (1,900) |
| Defined benefit plans | (105,000) | (69,100) | (53,800) |
| Foreign currency translation | (55,300) | 20,800 | (32,200) |
| Classification of equity and liability | 56,200 | 38,600 | 18,900 |
| Others | ¥ 96,900 | ¥ 69,100 | ¥ 77,200 |