Deposits (Narrative) (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Deposits [Line Items] | ||
| Time deposits, including certificates of deposits ("CDs"), issued in amount of JPY10 million or more, Domestic deposits | ¥ 76,858,340 | ¥ 69,396,042 |
| Minimum | ||
| Deposits [Line Items] | ||
| Issue amount of domestic time deposits in Japanese Yen | ¥ 10 |