Employee Benefits - Summary of Major Employee Benefits Expenses other than Retirement Benefits (Details) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Employee Benefits [Abstract] | |||
| Salary | ¥ 711,159 | ¥ 701,775 | ¥ 688,316 |
| Bonuses | 138,442 | 174,576 | 161,821 |
| Other | ¥ 273,240 | ¥ 266,491 | ¥ 274,094 |