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Deposits (Maturity Schedule of Time Deposits) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Deposits [Abstract]    
2026 ¥ 1,457,585  
2027 171,947  
2028 107,639  
2029 41,963  
2030 217,569  
Thereafter 76,304  
Total ¥ 2,073,007 ¥ 1,875,058