Employee Benefits - Summary of Sensitivity Analysis For Actuarial Assumptions Defined Benefit Obligations (Detail) - Actuarial assumption of discount rates [Member] - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Japanese plans [Member] | ||
| Disclosure of sensitivity analysis for actuarial assumptions [line items] | ||
| 0.5% decrease | ¥ 119,138 | ¥ 144,307 |
| 0.5% increase | (103,296) | (118,737) |
| Foreign plans [Member] | ||
| Disclosure of sensitivity analysis for actuarial assumptions [line items] | ||
| 0.5% decrease | 113,268 | 119,443 |
| 0.5% increase | ¥ (110,060) | ¥ (113,734) |