Intangible Assets - Summary of Carrying Value of Intangible Assets (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible assets | ¥ 1,392,755 | ¥ 1,363,266 |
| Capitalized development costs [Member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible assets | 523,437 | 582,606 |
| Software and other [Member] | ||
| Disclosure of detailed information about intangible assets [line items] | ||
| Intangible assets | ¥ 869,318 | ¥ 780,660 |