Employee Benefits - Summary of Amounts Recognized in the Consolidated Statement of Financial Position are Comprised (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of defined benefit plans [line items] | ||
| Retirement benefit liabilities | ¥ 1,022,483 | ¥ 1,019,568 |
| Japanese plans [Member] | ||
| Disclosure of defined benefit plans [line items] | ||
| Retirement benefit liabilities | 505,624 | 562,375 |
| Other non-current assets (Retirement benefit assets) | (261,855) | (341,723) |
| Net amount recognized | 243,769 | 220,652 |
| Foreign plans [Member] | ||
| Disclosure of defined benefit plans [line items] | ||
| Retirement benefit liabilities | 516,859 | 457,193 |
| Other non-current assets (Retirement benefit assets) | (125,771) | (106,376) |
| Net amount recognized | ¥ 391,088 | ¥ 350,817 |