v3.26.1
Financial Risk Management - Loans and Advances by Industry Sector (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of credit risk exposure [line items]    
Loans and advances ¥ 130,516,241 ¥ 125,190,819
Gross carrying amount [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 132,356,223 126,824,274
Gross carrying amount [member] | Domestic [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 77,971,747 73,240,162
Gross carrying amount [member] | Domestic [member] | Consumer [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances [1] 17,214,182 16,806,507
Gross carrying amount [member] | Housing loan [member] | Domestic [member] | Consumer [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances ¥ 10,857,602 ¥ 11,120,139
[1] The balance in Consumer mainly consists of housing loans. The housing loan balances amounted to ¥10,857,602 million and ¥11,120,139 million at March 31, 2026 and 2025, respectively.