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Provisions, contingent assets and contingent liabilities (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Opening balance R$ 19,592    
Closing balance 19,475 R$ 19,592  
Amounts related to banking operation 46,378   R$ 38,557
INSS [Member]      
IfrsStatementLineItems [Line Items]      
Non-compensatory amounts 8,915    
PIS and COFINS [Member]      
IfrsStatementLineItems [Line Items]      
Deposit balance 659    
Provisions recognized for tax and social securities lawsuits 672    
Reversal of revenues from depreciation in excess 3,370    
Irpj Csll Pis And Cofins [Member]      
IfrsStatementLineItems [Line Items]      
Funding expenses 6,066    
ISS [Member]      
IfrsStatementLineItems [Line Items]      
Amounts related to banking operation 5,338    
IRPJ and CSLL [Member]      
IfrsStatementLineItems [Line Items]      
Goodwill - Deduction 3,677    
Deductibility of losses in credit operations 1,327    
Deductibility of loss in loan operations 958    
IRPJ [Member]      
IfrsStatementLineItems [Line Items]      
Goodwill amount guaranteed in purchase agreements 2,508    
Provision for taxes other than income tax [member]      
IfrsStatementLineItems [Line Items]      
Opening balance 6,498 6,810  
(-) Provisions guaranteed by indemnity clause (71) (71)  
Subtotal 6,427 6,739  
Interest 628 202  
Changes in the period reflected in income (829) (8)  
Changes in the period reflected in income 829 8  
Increase 156 180  
Reversal (985) (172)  
Payment (86) (523)  
Subtotal 6,140 6,426  
(+) Provisions guaranteed by indemnity clause 74 72  
Closing balance 6,214 6,498 R$ 6,810
Current 4 10  
Non-current 6,210 R$ 6,488  
Social Security Contributions [Member] | INSS [Member]      
IfrsStatementLineItems [Line Items]      
Non-compensatory amounts 1,935    
Deposit balance R$ 1,167