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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, 2025
Mar. 31, 2024
Income Tax Disclosure [Abstract]    
Other assets ¥ 63,337 ¥ 66,519
Income taxes: Deferred 525,632 505,190
Net deferred tax liability ¥ 462,295 ¥ 438,671