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Deposits (Summary of Deposits) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2024
Mar. 31, 2023
Deposits [Abstract]    
Time deposits ¥ 1,875,058 ¥ 1,885,970
Other deposits 370,777 360,375
Total ¥ 2,245,835 ¥ 2,246,345