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Provisions, contingent assets and contingent liabilities (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Receivables balance arising from reimbursements of contingencies R$ 358 R$ 943
Civil Lawsuits [Member]    
IfrsStatementLineItems [Line Items]    
Total estimated risk 5,480 5,569
Labor Claims [Member]    
IfrsStatementLineItems [Line Items]    
Total estimated risk 1,048 870
Tax And Social Security Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Non-compensatory amounts 52,872 R$ 45,080
I N S S [Member]    
IfrsStatementLineItems [Line Items]    
Non-compensatory amounts 11,552  
I N S S [Member] | Social Security Contributions [Member]    
IfrsStatementLineItems [Line Items]    
Non-compensatory amounts 2,219  
Deposit balance 1,389  
Pis And Cofins [Member]    
IfrsStatementLineItems [Line Items]    
Deposit balance 719  
Provisions recognized for tax and social securities lawsuits 741  
Reversal of revenues from depreciation in excess 3,886  
Irpj Csll Pis And Cofins [Member]    
IfrsStatementLineItems [Line Items]    
Funding expenses 8,412  
I S S [Member]    
IfrsStatementLineItems [Line Items]    
Amounts related to banking operation 5,957  
Irpjandcsll [Member]    
IfrsStatementLineItems [Line Items]    
Goodwill - Deduction 4,141  
Deductibility of losses in credit operations 5,933  
Deductibility of loss in loan operations 2,965  
I R P J [Member]    
IfrsStatementLineItems [Line Items]    
Goodwill amount guaranteed in purchase agreements R$ 2,356