v3.26.1
Financial Risk Management - Loans and Advances by Industry Sector (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of credit risk exposure [line items]    
Adjust: Unearned income, unamortized premiums—net and deferred loan fees—net ¥ (603,143) ¥ (530,933)
Less: Allowance for loan losses (1,236,839) (1,102,522)
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] | Manufacturing [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 13,931,412 12,299,303
Gross carrying amount [member] | Domestic [member] | Agriculture, forestry, fisheries and mining [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 311,089 254,820
Gross carrying amount [member] | Domestic [member] | Construction [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 1,271,543 1,118,001
Gross carrying amount [member] | Domestic [member] | Transportation, communications and public enterprises [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 7,182,198 6,795,140
Gross carrying amount [member] | Domestic [member] | Wholesale and retail [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 7,315,429 6,413,857
Gross carrying amount [member] | Domestic [member] | Finance and insurance [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 4,149,868 3,962,719
Gross carrying amount [member] | Domestic [member] | Real estate and goods rental and leasing [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 19,246,697 18,144,037
Gross carrying amount [member] | Domestic [member] | Services [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 5,618,473 5,277,710
Gross carrying amount [member] | Domestic [member] | Municipalities [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 1,002,243 583,750
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] | Domestic [member] | Lease financing [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 16,878 21,154
Gross carrying amount [member] | Domestic [member] | Others [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 711,735 1,563,164
Gross carrying amount [member] | Foreign [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 54,384,476 53,584,112
Gross carrying amount [member] | Foreign [member] | Public sector [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 940,526 664,085
Gross carrying amount [member] | Foreign [member] | Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 12,694,870 12,415,685
Gross carrying amount [member] | Foreign [member] | Commerce and industry [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 31,880,801 32,682,288
Gross carrying amount [member] | Foreign [member] | Lease financing [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances 257,665 300,322
Gross carrying amount [member] | Foreign [member] | Others [member]    
Disclosure of credit risk exposure [line items]    
Loans and advances ¥ 8,610,614 ¥ 7,521,732
[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.