v3.26.1
Deposits (Maturity Schedule of Time Deposits) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Deposits [Abstract]    
2027 ¥ 1,538,991  
2028 157,040  
2029 75,999  
2030 176,685  
2031 321,836  
Thereafter 45,269  
Total ¥ 2,315,820 ¥ 2,073,007