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Securities sold under repurchase agreements and interbank and institutional market funds (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 372,294 R$ 328,645
Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 218,138 175,771
Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 154,156 152,874
Financial Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 70,083 81,197
Financial Credit Bills [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 23,878 38,061
Financial Credit Bills [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 46,205 43,136
Financial Credit Bills [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 4.43%  
Financial Credit Bills [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 15.06%  
Real Estate Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 52,112 48,955
Real Estate Credit Bills [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 36,871 28,476
Real Estate Credit Bills [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 15,241 20,479
Real Estate Credit Bills [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 7.00%  
Real Estate Credit Bills [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 13.00%  
Rural Credit Bills [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 49,744 39,072
Rural Credit Bills [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 34,803 17,037
Rural Credit Bills [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 14,941 22,035
Rural Credit Bills [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 5.00%  
Rural Credit Bills [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 13.72%  
Guaranteed Real State Notes [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 64,491 59,190
Guaranteed Real State Notes [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 13,252 6,131
Guaranteed Real State Notes [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 51,239 53,059
Guaranteed Real State Notes [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 5.11%  
Guaranteed Real State Notes [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 14.00%  
Credit Facilities Available For Financing Of Imports And Exports [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 117,921 87,144
Credit Facilities Available For Financing Of Imports And Exports [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 102,796 81,594
Credit Facilities Available For Financing Of Imports And Exports [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 15,125 5,550
Credit Facilities Available For Financing Of Imports And Exports [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 0.00%  
Credit Facilities Available For Financing Of Imports And Exports [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 10.20%  
Onlending Domestic [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 17,943 13,087
Onlending Domestic [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds 6,538 4,472
Onlending Domestic [Member] | Non Current [Member]    
IfrsStatementLineItems [Line Items]    
Interbank market funds R$ 11,405 R$ 8,615
Onlending Domestic [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 0.00%  
Onlending Domestic [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of interest on interbank market debt 18.00%