Employee Benefits - Effects on Defined Benefit Obligations Due to Increase or Decrease in Discount Rate (Detail) - Discount rates [member] - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Japanese plans [member] | ||
| Disclosure of sensitivity analysis for actuarial assumptions [line items] | ||
| Effects on defined benefit obligations from a decrease in the discount rate | ¥ 47,737 | ¥ 58,739 |
| Effects on defined benefit obligations from a increase in the discount rate | 43,353 | 53,176 |
| Foreign plans [member] | ||
| Disclosure of sensitivity analysis for actuarial assumptions [line items] | ||
| Effects on defined benefit obligations from a decrease in the discount rate | 62,969 | 62,310 |
| Effects on defined benefit obligations from a increase in the discount rate | ¥ 57,522 | ¥ 55,111 |