Deposits - Summary of Deposits (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
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|---|---|---|---|---|
| Deposits from customers [abstract] | ||||
| Non-interest-bearing demand deposits | ¥ 31,406,231 | ¥ 32,935,364 | ||
| Interest-bearing demand deposits | 83,600,262 | 80,370,602 | ||
| Deposits at notice | 17,580,666 | 14,655,807 | ||
| Time deposits | 42,142,744 | 34,482,582 | ||
| Negotiable certificates of deposit | 15,667,132 | 17,175,392 | ||
| Others | [1] | 11,533,392 | 10,402,995 | |
| Total deposits | ¥ 201,930,427 | ¥ 190,022,742 | ||
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