Income Taxes (Components of Net Deferred Tax Assets) (Detail) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deferred tax assets: | ||||||||||||
| Derivative financial instruments | ¥ 408,829 | ¥ 224,074 | ||||||||||
| Allowance for credit losses | 364,516 | 288,385 | ||||||||||
| Lease liabilities | 166,026 | 158,220 | ||||||||||
| Trading securities | 92,607 | 115,783 | ||||||||||
| Foreign tax credit and payments | [1] | 87,110 | 112,412 | |||||||||
| Premises and equipment | 52,928 | 45,797 | ||||||||||
| Available-for-sale securities | 38,313 | 1,454 | ||||||||||
| Net operating loss carryforwards | [2],[3] | 134,675 | 151,390 | |||||||||
| Other | 325,147 | 338,067 | ||||||||||
| Deferred Tax Assets, Gross, Total | 1,670,149 | 1,435,582 | ||||||||||
| Valuation allowance | (185,857) | [1],[2],[3] | (215,626) | [1],[2],[3] | ¥ (233,991) | ¥ (198,800) | ||||||
| Deferred tax assets, net of valuation allowance | 1,484,291 | 1,219,956 | ||||||||||
| Deferred tax liabilities: | ||||||||||||
| Investments | 606,109 | 370,063 | ||||||||||
| Prepaid pension cost and accrued pension liabilities | 212,903 | 203,490 | ||||||||||
| Right-of-use assets | 152,952 | 148,989 | ||||||||||
| Other | 184,537 | 188,913 | ||||||||||
| Deferred tax liabilities | 1,156,502 | 911,454 | ||||||||||
| Net deferred tax assets | ¥ 327,790 | ¥ 308,502 | ||||||||||
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