v3.26.1
Loans - Age Analysis of Past Due Loans (Detail) - JPY (¥)
¥ in Billions
Mar. 31, 2026
Mar. 31, 2025
30-59 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross ¥ 15 ¥ 21
30-59 Days Past Due | Domestic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 15 21
30-59 Days Past Due | Domestic | Corporate | Large companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 1
30-59 Days Past Due | Domestic | Corporate | Small and medium sized companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1 0
30-59 Days Past Due | Domestic | Retail | Housing Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 10 15
30-59 Days Past Due | Domestic | Retail | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 4 4
30-59 Days Past Due | Domestic | Retail | Soverign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
30-59 Days Past Due | Domestic | Banks and other financial institutions | Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
30-59 Days Past Due | Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross [1] 0 0
60-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 4 6
60-89 Days Past Due | Domestic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 4 6
60-89 Days Past Due | Domestic | Corporate | Large companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1 0
60-89 Days Past Due | Domestic | Corporate | Small and medium sized companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 1
60-89 Days Past Due | Domestic | Retail | Housing Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 3 5
60-89 Days Past Due | Domestic | Retail | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1 1
60-89 Days Past Due | Domestic | Retail | Soverign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
60-89 Days Past Due | Domestic | Banks and other financial institutions | Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
60-89 Days Past Due | Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross [1] 0 0
90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 78 80
90 Days or More Past Due | Domestic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 69 63
90 Days or More Past Due | Domestic | Corporate | Large companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 44 38
90 Days or More Past Due | Domestic | Corporate | Small and medium sized companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 6 5
90 Days or More Past Due | Domestic | Retail | Housing Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 10 11
90 Days or More Past Due | Domestic | Retail | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 9 9
90 Days or More Past Due | Domestic | Retail | Soverign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
90 Days or More Past Due | Domestic | Banks and other financial institutions | Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
90 Days or More Past Due | Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross [1] 9 17
Total Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 97 108
Total Past Due | Domestic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 88 90
Total Past Due | Domestic | Corporate | Large companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 44 39
Total Past Due | Domestic | Corporate | Small and medium sized companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 7 6
Total Past Due | Domestic | Retail | Housing Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 23 31
Total Past Due | Domestic | Retail | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 14 15
Total Past Due | Domestic | Retail | Soverign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
Total Past Due | Domestic | Banks and other financial institutions | Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 0 0
Total Past Due | Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross [1] 9 17
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 105,739 99,150
Current | Domestic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 62,654 61,192
Current | Domestic | Corporate | Large companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 50,528 45,840
Current | Domestic | Corporate | Small and medium sized companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 2,721 2,741
Current | Domestic | Retail | Housing Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 6,608 6,791
Current | Domestic | Retail | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1,180 1,260
Current | Domestic | Retail | Soverign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 552 3,693
Current | Domestic | Banks and other financial institutions | Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1,065 867
Current | Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross [1] 43,085 37,958
Total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 105,836 99,257
Total | Domestic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 62,742 61,282
Total | Domestic | Corporate | Large companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 50,573 45,879
Total | Domestic | Corporate | Small and medium sized companies    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 2,727 2,746
Total | Domestic | Retail | Housing Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 6,630 6,822
Total | Domestic | Retail | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1,195 1,275
Total | Domestic | Retail | Soverign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 552 3,693
Total | Domestic | Banks and other financial institutions | Retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 1,065 867
Total | Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross [1] ¥ 43,094 ¥ 37,975
[1] The majority of total foreign consist of corporate.