Income Taxes (Components of Net Deferred Tax Assets) (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Deferred tax assets: | ||
| Allowance for credit losses | ¥ 392,077 | ¥ 390,614 |
| Operating loss carryforwards | 72,964 | 86,747 |
| Accrued liabilities and other | 424,866 | 328,371 |
| Premises and equipment | 106,131 | 113,572 |
| Derivative financial instruments | 984,938 | 649,519 |
| Obligations under operating leases | 97,589 | 89,790 |
| Valuation allowance | (117,183) | (122,241) |
| Total deferred tax assets | 1,961,382 | 1,536,372 |
| Deferred tax liabilities: | ||
| Investment securities (including trading account assets at fair value under the fair value option) | 748,676 | 642,105 |
| Loans | 4,333 | 3,466 |
| Intangible assets | 87,980 | 87,064 |
| Lease transactions | 15,002 | 16,866 |
| Defined benefit plans | 376,848 | 270,634 |
| Investments in subsidiaries and affiliates | 1,295,676 | 1,002,424 |
| Right-of-use assets of operating leases | 74,945 | 64,074 |
| Other | 0 | 81,284 |
| Total deferred tax liabilities | 2,603,460 | 2,167,917 |
| Net deferred tax liabilities | ¥ (642,078) | ¥ (631,545) |
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from defined benefit plans. No definition available.
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from obligations under operating leases. No definition available.
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for credit losses. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from investments in subsidiaries and affiliates. No definition available.
|
| X | ||||||||||
- Definition Amount of estimated future tax effect as of the balance sheet date, which is attributable to unrealized gains on investment securities including trading assets under fair value option. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from obligations under right-of-use assets of operating leases. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from financing arrangements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|