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Risk management (Details 4) - BRL (R$)
R$ in Millions
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Cash/Applications/Debt Instruments R$ 185,883 R$ 221,750
Loans and advances to customers 10,961 6,195
Derivatives 373,714 455,792
Others 51,530 33,181
Total 622,088 716,918
Funding in foreign currency 194,447 183,193
Derivatives 283,912 422,756
Others 147,839 119,948
Total 626,198 725,897
Currency Risk Dollar [Member]    
IfrsStatementLineItems [Line Items]    
Cash/Applications/Debt Instruments 175,247 207,780
Loans and advances to customers 3,866 5,629
Derivatives 349,167 421,574
Others 51,530 33,181
Total 579,810 668,164
Funding in foreign currency 181,855 172,082
Derivatives 256,286 384,550
Others 145,446 116,669
Total 583,587 673,301
Currency Risk Euro [Member]    
IfrsStatementLineItems [Line Items]    
Cash/Applications/Debt Instruments 7,950 10,523
Loans and advances to customers 5,610 1
Derivatives 15,713 19,908
Others
Total 29,273 30,432
Funding in foreign currency 8,881 8,333
Derivatives 20,376 25,804
Others 496 501
Total 29,753 34,638
Currency Risk Others [Member]    
IfrsStatementLineItems [Line Items]    
Cash/Applications/Debt Instruments 2,686 3,447
Loans and advances to customers 1,485 565
Derivatives 8,834 14,310
Others
Total 13,005 18,322
Funding in foreign currency 3,711 2,778
Derivatives 7,250 12,402
Others 1,897 2,778
Total R$ 12,858 R$ 17,958