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Due to Trust Account, Short-term Borrowings and Long-term Debt (Summary of Subsequent Maturities of Long-term Debt) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2023
Mar. 31, 2022
Long-term debt by maturity:    
2024 ¥ 2,830,247  
2025 20,013,765  
2026 3,831,450  
2027 1,003,013  
2028 2,615,782  
2028 and thereafter 8,793,528  
Total 39,087,785 ¥ 34,710,293
MUFG    
Long-term debt by maturity:    
2024 899,334  
2025 1,331,578  
2026 2,267,854  
2027 580,729  
2028 1,346,562  
2028 and thereafter 6,400,006  
Total 12,826,063 10,083,549
BK    
Long-term debt by maturity:    
2024 1,239,768  
2025 18,187,331  
2026 1,245,954  
2027 164,253  
2028 1,167,991  
2028 and thereafter 1,270,776  
Total 23,276,073 21,396,282
Other subsidiaries    
Long-term debt by maturity:    
2024 691,145  
2025 494,856  
2026 317,642  
2027 258,031  
2028 101,229  
2028 and thereafter 1,122,746  
Total ¥ 2,985,649 ¥ 3,230,462