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Interbank deposits and securities purchased under agreements to resell (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell R$ 56,292 R$ 46,820 R$ 55,711
Interbank deposits 12,584 12,555 R$ 3,888
Amounts pledged in guarantee of operations 14,576 9,266  
Losses (9) (15)  
B3 S.A. - Brasil, Bolsa, Balco [Member]      
IfrsStatementLineItems [Line Items]      
Amounts pledged in guarantee of operations 14,576 9,266  
Central Bank [Member]      
IfrsStatementLineItems [Line Items]      
Amounts pledged in guarantee of operations 151,856    
Amounts pledged in guarantee of repurchase agreement transactions   114,750  
Interbank deposits and securities purchased under agreements to resell [member]      
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell 221,776 169,711  
Collateral held 69,920 54,961  
Collateral repledge 128,542 103,968  
Assets received as collateral with right to sell or repledge 14,846 22,139  
Assets received as collateral without right to sell or repledge 113,696 81,829  
Collateral sold 23,314 10,782  
Interbank deposits 59,586 69,934  
Total 281,362 239,645  
Interbank deposits and securities purchased under agreements to resell [member] | Current [member]      
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell 221,726 168,937  
Collateral held 69,870 54,187  
Collateral repledge 128,542 103,968  
Assets received as collateral with right to sell or repledge 14,846 22,139  
Assets received as collateral without right to sell or repledge 113,696 81,829  
Collateral sold 23,314 10,782  
Interbank deposits 56,672 64,049  
Total 278,398 232,986  
Interbank deposits and securities purchased under agreements to resell [member] | Non current [member]      
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell 50 774  
Collateral held 50 774  
Interbank deposits 2,914 5,885  
Total R$ 2,964 R$ 6,659