Financial Assets at Fair Value through Profit or Loss - Summary of Financial Assets at Fair Value through Profit or Loss (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Financial assets at fair value through profit or loss | ¥ 2,705,113 | ¥ 2,902,969 |
| Debt instruments [member] | ||
| Disclosure of financial assets [line items] | ||
| Financial assets at fair value through profit or loss | 2,620,759 | 2,820,665 |
| Equity instruments [member] | ||
| Disclosure of financial assets [line items] | ||
| Financial assets at fair value through profit or loss | ¥ 84,354 | ¥ 82,304 |