Income Taxes - Components by Expiry of the Carryforward of Unused Tax Losses for which Deferred Tax Assets are not Recognized (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unused tax losses | ¥ 566,262 | ¥ 436,674 |
| Within 1 year [member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unused tax losses | 16,853 | 12,142 |
| Between 1 and 5 years [member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unused tax losses | 204,354 | 92,042 |
| Between 5 and 20 years [member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unused tax losses | 49,376 | 36,115 |
| Indefinite periods [member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unused tax losses | ¥ 295,679 | ¥ 296,375 |