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Financial assets at amortized cost - Securities (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Amortized cost R$ 1,912,804 R$ 1,686,225
Financial Assets Securities [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 327,507 260,743
Expected loss (3,655) (854)
Net amortized cost 323,852 259,889
Financial Assets Securities [Member] | Brazilian Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 111,824 94,990
Expected loss (16) (23)
Net amortized cost 111,808 94,967
Financial Assets Securities [Member] | Government securities - Latin America [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 21,730 27,874
Expected loss (9) (9)
Net amortized cost 21,721 27,865
Financial Assets Securities [Member] | Government Securities – Other Countries [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 25,126 22,712
Expected loss (3) (4)
Net amortized cost 25,123 22,708
Financial Assets Securities [Member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 168,827 115,167
Expected loss (3,627) (818)
Net amortized cost 165,200 114,349
Financial Assets Securities [Member] | Corporate Securities [Member] | Rural Product Note [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 60,358 38,146
Expected loss (416) (190)
Net amortized cost 59,942 37,956
Financial Assets Securities [Member] | Corporate Securities [Member] | Bank Deposit Certificates [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 50 19
Net amortized cost 50 19
Financial Assets Securities [Member] | Corporate Securities [Member] | Real Estate Receivables Certificates [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 5,827 5,911
Expected loss (9) (7)
Net amortized cost 5,818 5,904
Financial Assets Securities [Member] | Corporate Securities [Member] | Debentures [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 77,344 57,399
Expected loss (3,101) (586)
Net amortized cost 74,243 56,813
Financial Assets Securities [Member] | Corporate Securities [Member] | Eurobonds And Others [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 1,102 516
Expected loss (9)  
Net amortized cost 1,093 516
Financial Assets Securities [Member] | Corporate Securities [Member] | Financial bills [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 212 1,575
Expected loss   (2)
Net amortized cost 212 1,573
Financial Assets Securities [Member] | Corporate Securities [Member] | Promissory And Commercial Notes [Member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 16,312 10,253
Expected loss (32) (23)
Net amortized cost 16,280 10,230
Financial Assets Securities [Member] | Corporate Securities [Member] | Other [member]    
IfrsStatementLineItems [Line Items]    
Amortized cost 7,622 1,348
Expected loss (60) (10)
Net amortized cost R$ 7,562 R$ 1,338