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5 Risk management (Details 5) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of risk management [Line Items]    
Cash and cash equivalents and financial investments R$ 3,807,547 R$ 2,253,210
Other [member]    
Summary of risk management [Line Items]    
Cash and cash equivalents and financial investments [1] 253,619 17,493
AA (bra) [member]    
Summary of risk management [Line Items]    
Cash and cash equivalents and financial investments 2,662,685 2,193,725
AAA(bra) [member]    
Summary of risk management [Line Items]    
Cash and cash equivalents and financial investments R$ 891,243 R$ 41,992
[1] This category includes current accounts and investment funds in banks whose balances were not significant in 2019. The amount of R$ 253,066 referring to Banco BV (no classification) was recorded in 2020.