Equity Attributable To Other Equity Instruments Holders - Equity Attributable to Other Equity Instruments Holders (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Statement [Line Items] | ||
| Equity attributable to other equity instruments holders | ¥ 2,252,846 | ¥ 1,868,377 |
| Perpetual Subordinated Bonds [Member] | ||
| Statement [Line Items] | ||
| Equity attributable to other equity instruments holders | 2,170,848 | 1,815,379 |
| Perpetual Subordinated Borrowings [Member] | ||
| Statement [Line Items] | ||
| Equity attributable to other equity instruments holders | ¥ 81,998 | ¥ 52,998 |