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5 Risk management (Details 4)
 12 Months Ended
Dec. 31, 2020
Banco do brasil S/A [member] | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aa1.br
Banco do brasil S/A [member] | Fitch [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks AA(bra)
Brazilian Federal Savings Bank | Standard Poor's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks brAAA
Brazilian Federal Savings Bank | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aa1.br
Brazilian Federal Savings Bank | Fitch [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks AA(bra)
Banco Bradesco S/A | Standard Poor's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks brAAA
Banco Bradesco S/A | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aa1.br
Banco Bradesco S/A | Fitch [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks AAA(bra)
Itau Unibanco Holding S/A | Standard Poor's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks brAAA
Itau Unibanco Holding S/A | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aa1.br
Itau Unibanco Holding S/A | Fitch [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks AAA(bra)
Banco BTG Pactual S/A [member] | Fitch [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks AA(bra)
Banco BTG Pactual S/A [member] | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aa2.br
Banco BTG Pactual S/A [member] | Standard Poor's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks brAA+
Banco santander brasil S/A [member] | Standard Poor's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks brAAA
Banco santander brasil S/A [member] | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aaa.br
Banco BV [member] | Moody's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks Aa3.br
Banco BV [member] | Standard Poor's [member]  
Summary of risk management [Line Items]  
Credit rating information of the banks brAAA