Financial Risks - Summary of Value-At-Risk Analysis Measurement Foreign Currency Positions (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Year-end [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | ¥ 465,300 | ¥ 411,300 |
| Average [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | 441,800 | 403,025 |
| Maximum [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | 465,300 | 413,800 |
| MInimum [Member] | ||
| Disclosure of value-at-risk analysis measurement foreign currency positions [Line items] | ||
| Foreign Currency Positions | ¥ 408,500 | ¥ 389,000 |