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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, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Income before income taxes | ¥ 469,975 | ¥ 392,178 | ¥ 509,447
Tax provision computed at the statutory rate | 148,042 | 123,536 | 160,476
Increases (reductions) in taxes due to: |  |  |
Change in valuation allowance | 5,441 | 2,533 | 11,464
Nondeductible expenses | 4,762 | 4,794 | 4,066
Nontaxable income | (3,574) | (3,347) | (2,611)
Effect of lower tax rates on certain subsidiaries | (17,627) | (19,764) | (18,694)
Effect of investor taxes on earnings of subsidiaries | 7,674 | 4,789 | 8,155
Effect of sale or liquidation of subsidiaries | (14,995) | (16,754) | 25,642
Other, net | 1,665 | (542) | (1,904)
Provision for income taxes | ¥ 131,388 | ¥ 95,245 | ¥ 186,594

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