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Income Taxes (Captions of Net Deferred Tax Assets and Liabilities Reflected in Consolidated Balance Sheets) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Other assets | ¥ 66,519 | ¥ 48,292
Income taxes: Deferred | 505,190 | 429,063
Net deferred tax liability | ¥ 438,671 | ¥ 380,771

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