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8 Financial investments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
FinancialInvestmentsLineItems [Line Items]    
Financial investments R$ 3,411,146 R$ 0
Banco BV [member]    
FinancialInvestmentsLineItems [Line Items]    
Financial investments 253,066  
Banco Itau S/A [member]    
FinancialInvestmentsLineItems [Line Items]    
Financial investments 354,296  
Banco Bradesco S/A [member]    
FinancialInvestmentsLineItems [Line Items]    
Financial investments 506,136  
Banco BTG Pactual S/A [member]    
FinancialInvestmentsLineItems [Line Items]    
Financial investments 354,299  
Banco do Brasil S/A [member]    
FinancialInvestmentsLineItems [Line Items]    
Financial investments R$ 1,943,349