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Deposits (Summary of Deposits) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2023
Mar. 31, 2022
Deposits [Abstract]    
Time deposits ¥ 1,885,970 ¥ 1,876,129
Other deposits 360,375 400,029
Total ¥ 2,246,345 ¥ 2,276,158