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21 Employees benefits (Details 8) - G1 Plan [member]
R$ in Thousands
12 Months Ended
Dec. 31, 2020
BRL (R$)
Summary of employee benefits [Line Items]  
Cost of services, net R$ 2,226
Interest costs 205,707
Net profitability on financial assets (184,687)
Expenditures to be recognized by the employer R$ 23,246