Financial Risks - Summary of Value-At-Risk Analysis Measurement Foreign Currency Positions (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Year-end [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | ¥ 497,100 | ¥ 465,300 |
| Average [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | 486,275 | 441,800 |
| Maximum [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | 505,100 | 465,300 |
| MInimum [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | ¥ 462,700 | ¥ 408,500 |