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26 Accounts Payable Related to Concessions (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable Related To Concessions    
Accounts payable related to concession, beginning R$ 612,587 R$ 584,163
Additions 3,682  
Adjust to present value (1,112) (668)
Monetary variations 191,638 99,661
Payments (74,931) (70,569)
Accounts payable related to concession, ending R$ 731,864 R$ 612,587