Investments in associates and joint ventures - Additional Information (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Investments In Joint Ventures And Associates [Line Items] | ||
| Other current liabilities | ¥ 1,350,951 | ¥ 1,448,402 |
| Sony Honda Mobility Inc [Member] | ||
| Investments In Joint Ventures And Associates [Line Items] | ||
| Additional amount of loss of equity method investment | 44,900 | |
| Other current liabilities | ¥ 25,200 |