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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
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