Income Taxes - Summary of Unrecognized Deferred Tax Assets on Tax Losses Carryforwards (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Disclosure details of carry forward details of tax losses unutilised for which no deferred tax assets are recognised [Line items] | ||
| Tax losses carryforward | ¥ 841,136 | ¥ 762,196 |
| Within 5 years [Member] | ||
| Disclosure details of carry forward details of tax losses unutilised for which no deferred tax assets are recognised [Line items] | ||
| Tax losses carryforward | 4,323 | 7,791 |
| Between 5 and 10 years [Member] | ||
| Disclosure details of carry forward details of tax losses unutilised for which no deferred tax assets are recognised [Line items] | ||
| Tax losses carryforward | 319,631 | 357,421 |
| Later than 10 years [Member] | ||
| Disclosure details of carry forward details of tax losses unutilised for which no deferred tax assets are recognised [Line items] | ||
| Tax losses carryforward | ¥ 517,182 | ¥ 396,984 |