Business segment information - Summary of sales attributed to countries and areas based on location of external customers and non-current assets (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of geographical areas [line items] | |||
| Sales | ¥ 12,479,620 | ¥ 12,034,917 | ¥ 11,260,037 |
| Non-current assets | 6,870,249 | 6,464,326 | |
| Japan [Member] | |||
| Disclosure of geographical areas [line items] | |||
| Sales | 1,333,202 | 1,322,209 | 1,266,795 |
| Non-current assets | 1,919,158 | 2,090,652 | |
| United States [Member] | |||
| Disclosure of geographical areas [line items] | |||
| Sales | 4,064,440 | 4,127,795 | 3,751,239 |
| Non-current assets | 3,328,940 | 2,915,183 | |
| Europe [Member] | |||
| Disclosure of geographical areas [line items] | |||
| Sales | 2,826,805 | 2,630,934 | 2,632,963 |
| Non-current assets | 1,119,027 | 989,679 | |
| China [Member] | |||
| Disclosure of geographical areas [line items] | |||
| Sales | 1,428,677 | 1,244,115 | 1,000,907 |
| Non-current assets | 29,899 | 27,372 | |
| Asia Pacific [Member] | |||
| Disclosure of geographical areas [line items] | |||
| Sales | 1,694,889 | 1,640,582 | 1,659,776 |
| Non-current assets | 243,264 | 233,895 | |
| Other Areas [Member] | |||
| Disclosure of geographical areas [line items] | |||
| Sales | 1,131,607 | 1,069,282 | ¥ 948,357 |
| Non-current assets | ¥ 229,961 | ¥ 207,545 | |