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5 Risk management (Details Narrative)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
RiskManagementLineItems [Line Items]      
Total exposure R$ 3,563,170   R$ 6,382,009
Effects on profit for the year before taxes R$ 141,854   R$ 92,242
Leverage ratio 37.00% 37.00% 34.00%
Financial instrument assets receivables from related parties R$ 806,645   R$ 850,896
Reimbursement of additional retirement and pension plan R$ 732,391   747,579
Percentage of decrease in currency due to debt 44.20% 44.20%  
Liabilities related to exchange rate variation of borrowings and financing contracts R$ 2,247,544   288,678
Income before taxes R$ 356,317   R$ 638,201
Description of currency exposure Considering the other variables as remaining constant, the impacts for the next 12 months are shown in scenarios II and III with possible depreciations of 25% and 50%, respectively, in the Brazilian real. Considering the other variables as remaining constant, the impacts for the next 12 months are shown in scenarios II and III with possible depreciations of 25% and 50%, respectively, in the Brazilian real.  
BID 2202 contract [member]      
RiskManagementLineItems [Line Items]      
Exchange of foreign currency R$ 2,810,907    
USD      
RiskManagementLineItems [Line Items]      
Depreciation 28.90% 28.90%  
USD | BID 2202 contract [member]      
RiskManagementLineItems [Line Items]      
Exchange of foreign currency | $   $ 494,617  
Yen      
RiskManagementLineItems [Line Items]      
Depreciation 35.70% 35.70%  
Eurobonds [member]      
RiskManagementLineItems [Line Items]      
Final amortization of Eurobonds R$ 1,910,124    
Eurobonds [member] | USD      
RiskManagementLineItems [Line Items]      
Final amortization of Eurobonds | $   $ 357,763  
Banco BV [member]      
RiskManagementLineItems [Line Items]      
Current accounts and investment funds R$ 253,066