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Securities sold under repurchase agreements and interbank and institutional market funds (Details 2) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Institutional market funds R$ 129,382 R$ 138,636
Current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 20,731 27,906
Non current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 108,651 110,730
Subordinated Debts [Member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 54,540 75,036
Subordinated Debts [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 9,851 21,203
Subordinated Debts [Member] | Non current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 44,689 53,833
Obligations On Securities Abroad [Member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 70,521 62,843
Obligations On Securities Abroad [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 10,333 6,560
Obligations On Securities Abroad [Member] | Non current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 60,188 56,283
Raisings Through Structured Operations Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 4,321 757
Market value of fund 4,949 790
Raisings Through Structured Operations Certificates [Member] | Current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds 547 143
Raisings Through Structured Operations Certificates [Member] | Non current [member]    
IfrsStatementLineItems [Line Items]    
Institutional market funds R$ 3,774 R$ 614