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Due to Trust Account, Short-term Borrowings and Long-term Debt (Components of Other Short-term Borrowings) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2024
Mar. 31, 2023
Short-term Debt [Line Items]    
Total ¥ 11,137,491 ¥ 8,440,850
Less unamortized discount 0 2,836
Other short-term borrowings—net ¥ 11,137,491 ¥ 8,438,014
Weighted average interest rate on outstanding balance at end of fiscal year 3.02% 2.83%
Domestic offices:    
Short-term Debt [Line Items]    
Total ¥ 4,756,732 ¥ 3,382,396
Domestic offices: | Commercial paper    
Short-term Debt [Line Items]    
Total 1,319,959 1,123,528
Domestic offices: | Borrowings from the Bank of Japan    
Short-term Debt [Line Items]    
Total 2,171,660 1,186,251
Domestic offices: | Borrowings from other financial institutions    
Short-term Debt [Line Items]    
Total 96,645 95,785
Domestic offices: | Other    
Short-term Debt [Line Items]    
Total 1,168,468 976,832
Foreign offices:    
Short-term Debt [Line Items]    
Total 6,380,759 5,058,454
Other short-term borrowings—net 6,380,759 5,058,454
Foreign offices: | Commercial paper    
Short-term Debt [Line Items]    
Total 6,160,424 4,771,323
Foreign offices: | Borrowings from other financial institutions    
Short-term Debt [Line Items]    
Total 194,119 160,292
Foreign offices: | Short-term debentures    
Short-term Debt [Line Items]    
Total 12,491 21,338
Foreign offices: | Other    
Short-term Debt [Line Items]    
Total ¥ 13,725 ¥ 105,501