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Interbank deposits and securities purchased under agreements to resell (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell R$ 71,072 R$ 75,960 R$ 56,292
Interbank deposits 10,087 8,582 R$ 12,584
Interbank deposits and securities purchased under agreements to resell [member]      
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell 243,219 238,308  
Collateral held 78,198 79,600  
Collateral repledge 117,108 125,811  
Assets received as collateral with right to sell or repledge 7,223 3,733  
Assets received as collateral without right to sell or repledge 109,885 122,078  
Collateral sold 47,913 32,897  
Interbank deposits 66,925 51,000  
Total 310,144 289,308  
Interbank deposits and securities purchased under agreements to resell [member] | Current [member]      
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell 242,542 238,227  
Collateral held 77,521 79,577  
Collateral repledge 117,108 125,753  
Assets received as collateral with right to sell or repledge 7,223 3,733  
Assets received as collateral without right to sell or repledge 109,885 122,020  
Collateral sold 47,913 32,897  
Interbank deposits 53,529 43,857  
Total 296,071 282,084  
Interbank deposits and securities purchased under agreements to resell [member] | Non Current [Member]      
IfrsStatementLineItems [Line Items]      
Securities purchased under agreements to resell 677 81  
Collateral held 677 23  
Collateral repledge   58  
Assets received as collateral without right to sell or repledge   58  
Interbank deposits 13,396 7,143  
Total R$ 14,073 R$ 7,224