Related Parties - Amount of Transactions with Affiliates and Joint Ventures (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of transactions between related parties [line items] | |||
| Sales revenue | ¥ 644,961 | ¥ 717,463 | ¥ 959,930 |
| Purchase | 2,126,198 | 2,093,844 | 2,062,790 |
| Affiliates [member] | |||
| Disclosure of transactions between related parties [line items] | |||
| Sales revenue | 162,973 | 152,256 | 141,323 |
| Purchase | 1,686,392 | 1,731,349 | 1,620,755 |
| Joint ventures [member] | |||
| Disclosure of transactions between related parties [line items] | |||
| Sales revenue | 481,988 | 565,207 | 818,607 |
| Purchase | ¥ 439,806 | ¥ 362,495 | ¥ 442,035 |