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Stockholders' equity (Details 4) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Capital reserves R$ 2,732 R$ 2,620
Total reserves at parent company 124,160 107,085
Premium On Subscription Of Shares [Member]    
IfrsStatementLineItems [Line Items]    
Capital reserves 284 284
Reserve of share-based payments [member]    
IfrsStatementLineItems [Line Items]    
Capital reserves 2,444 2,332
Revenue reserves 121,428 104,465
Reserves From Tax Incentives Restatement Of Equity Securities And Other [Member]    
IfrsStatementLineItems [Line Items]    
Capital reserves 4 4
Legal [Member]    
IfrsStatementLineItems [Line Items]    
Revenue reserves 18,146 16,740
Statutory reserve [member]    
IfrsStatementLineItems [Line Items]    
Revenue reserves 87,793 76,725
Special Revenue [Member]    
IfrsStatementLineItems [Line Items]    
Revenue reserves R$ 15,489 R$ 11,000