v3.26.1
Short-term borrowings and long-term debt - Summary of Pledged Assets as Collateral (Detail)
¥ in Millions
Mar. 31, 2025
JPY (¥)
Certain Assets Pledged As Collateral For Short Term Borrowings And Long Term Debt [Line Items]  
Securities ¥ 332,867
Securities 140,212
Securities [member]  
Certain Assets Pledged As Collateral For Short Term Borrowings And Long Term Debt [Line Items]  
Financial assets pledged as collateral for liabilities or contingent liabilities 1,595,016
Housing Loans in The Banking Business [member]  
Certain Assets Pledged As Collateral For Short Term Borrowings And Long Term Debt [Line Items]  
Financial assets pledged as collateral for liabilities or contingent liabilities ¥ 961,286