Financial instruments - Summary of Equity Instruments Measured at Fair Value Through Other Comprehensive Income (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Marketable Equity Instruments [Member] | ||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||
| Equity instruments measured at fair value through other comprehensive income | ¥ 86,339 | ¥ 67,834 |
| Non-marketable equity instruments [Member] | ||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||
| Equity instruments measured at fair value through other comprehensive income | 302,488 | 249,181 |
| Equity Instruments [Member] | ||
| Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] | ||
| Equity instruments measured at fair value through other comprehensive income | ¥ 388,827 | ¥ 317,015 |