Intangible Assets - Summary of Carrying Value of Intangible Assets (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible assets | ¥ 1,363,266 | ¥ 1,355,326 |
| Capitalized development costs [Member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible assets | 582,606 | 638,337 |
| Software and other [Member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible assets | ¥ 780,660 | ¥ 716,989 |