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Risk management (Details 4)
 3 Months Ended
Mar. 31, 2024
Fitch [Member] | Banco Do Brasil [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA(bra)
Fitch [Member] | Banco Santander Brasil [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks
Fitch [Member] | Brazilian Federal Savings Bank [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA(bra)
Fitch [Member] | Banco Bradesco [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA(bra)
Fitch [Member] | Banco Itau Unibanco [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA(bra)
Fitch [Member] | Banco B V [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks
Fitch [Member] | Banco B T G Pactual S A [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA(bra)
Moodys [Member] | Banco Do Brasil [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA.br
Moodys [Member] | Banco Santander Brasil [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA.br
Moodys [Member] | Brazilian Federal Savings Bank [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA.br
Moodys [Member] | Banco Bradesco [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA.br
Moodys [Member] | Banco Itau Unibanco [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA.br
Moodys [Member] | Banco B V [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AA.br
Moodys [Member] | Banco B T G Pactual S A [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks AAA.br
Standard Poors [Member] | Banco Do Brasil [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks
Standard Poors [Member] | Banco Santander Brasil [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks brAAA
Standard Poors [Member] | Brazilian Federal Savings Bank [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks brAAA
Standard Poors [Member] | Banco Bradesco [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks brAAA
Standard Poors [Member] | Banco Itau Unibanco [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks
Standard Poors [Member] | Banco B V [Member]  
IfrsStatementLineItems [Line Items]  
Credit rating information of the banks brAAA