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Interest and similar income and expenses and income of financial assets and liabilities at fair value through profit or loss (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss R$ 32,011 R$ 29,145 R$ 13,325
Derivatives [member]      
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss 19,781 (2,954) 3,477
Financial Assets Designated At Fair Value Through Profit Or Loss Equity Securities [Member]      
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss (3) 479 660
Securities [Member]      
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss 12,170 31,399 8,882
Other Financial Assets At Fair Value Through Profit Or Loss [Member]      
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss 2 1,897 1,800
Financial liabilities at fair value through profit or loss, category [member]      
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss (14) (1,731) (1,535)
Financial Liability Designated At Fair Value [Member]      
IfrsStatementLineItems [Line Items]      
Income of financial assets and liabilities at fair value through profit or loss R$ 75 R$ 55 R$ 41