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Call Money and Funds Purchased (Tables)
 12 Months Ended
Mar. 31, 2024
Call Money And Funds Purchased [Abstract]  
Summary of Funds Transactions
A summary of funds transactions for the fiscal years ended March 31, 2023 and 2024 is as follows:
 20232024
 
(in millions, except percentages and days)
Outstanding at end of fiscal year:   
Amount¥3,437,614 ¥5,094,171 
Principal range of maturities
1 day to 30 days
1 day to 30 days
Weighted average interest rate0.01 %0.09 %