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Income Taxes (Reconciliations of Differences between Tax Provision Computed at Statutory Rate and Consolidated Provision for Income Taxes) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income before income taxes | ¥ 367,168 | ¥ 504,876 | ¥ 287,561
Tax provision computed at the statutory rate | 115,658 | 159,036 | 90,582
Increases (reductions) in taxes due to: |  |  |
Change in valuation allowance | 2,533 | 11,464 | 6,808
Nondeductible expenses | 4,794 | 4,066 | 2,751
Nontaxable income | (3,347) | (2,611) | (1,629)
Effect of lower tax rates on certain subsidiaries | (19,631) | (16,584) | (12,895)
Effect of investor taxes on earnings of subsidiaries | 4,789 | 8,155 | 4,590
Effect of the tax law and rate changes | 180 | (142) | 1,158
Effect of sale or liquidation of subsidiaries | (16,754) | 25,642 | 878
Other, net | (722) | (1,762) | (1,496)
Provision for income taxes | ¥ 87,500 | ¥ 187,264 | ¥ 90,747

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