Related party transactions - Balances of Receivables and Payables with Associates and Joint Ventures (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Trade accounts and other receivables | ||
| Amounts receivable, related party transactions | ¥ 706,334 | ¥ 545,671 |
| Trade accounts and other payables | ||
| Amounts payable, related party transactions | 1,865,066 | 1,584,702 |
| Associates [Member] | ||
| Trade accounts and other receivables | ||
| Amounts receivable, related party transactions | 599,558 | 466,420 |
| Trade accounts and other payables | ||
| Amounts payable, related party transactions | 1,844,886 | 1,576,129 |
| Joint ventures [Member] | ||
| Trade accounts and other receivables | ||
| Amounts receivable, related party transactions | 106,776 | 79,251 |
| Trade accounts and other payables | ||
| Amounts payable, related party transactions | ¥ 20,180 | ¥ 8,573 |