v3.26.1
Risk and Capital Management - Schedule of Collateral for Loans and Financial Lease Operations (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets R$ 567,842 R$ 527,992
Over-collateralized assets, Fair value of collateral 1,447,962 1,423,267
Under-collateralized assets, Carrying value of the assets 99,830 79,750
Under-collateralized assets, Fair value of collateral 82,844 67,332
Companies    
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets 180,843 166,845
Over-collateralized assets, Fair value of collateral 556,310 592,523
Under-collateralized assets, Carrying value of the assets 83,034 63,892
Under-collateralized assets, Fair value of collateral 75,174 60,395
Foreign loans - Latin America | Foreign    
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets 196,787 188,756
Over-collateralized assets, Fair value of collateral 390,985 374,316
Under-collateralized assets, Carrying value of the assets 13,884 12,731
Under-collateralized assets, Fair value of collateral 5,695 4,201
Individuals    
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets 190,212 172,391
Over-collateralized assets, Fair value of collateral 500,667 456,428
Under-collateralized assets, Carrying value of the assets 2,912 3,127
Under-collateralized assets, Fair value of collateral 1,975 2,736
Individuals | Vehicles    
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets 30,321 31,859
Over-collateralized assets, Fair value of collateral 66,419 70,772
Under-collateralized assets, Carrying value of the assets 1,094 1,119
Under-collateralized assets, Fair value of collateral 977 1,026
Individuals | Personal loan    
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets 9,102 8,128
Over-collateralized assets, Fair value of collateral 40,167 25,156
Under-collateralized assets, Carrying value of the assets 958 1,673
Under-collateralized assets, Fair value of collateral 828 1,556
Individuals | Mortgage loans    
Disclosure of detailed information about borrowings [line items]    
Over-collateralized assets, Carrying value of the assets 150,789 132,404
Over-collateralized assets, Fair value of collateral 394,081 360,500
Under-collateralized assets, Carrying value of the assets 860 335
Under-collateralized assets, Fair value of collateral R$ 170 R$ 154