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26 Accounts Payable Related to Concessions (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Payable Related To Concessions    
Accounts payable related to concession, beginning R$ 584,163 R$ 554,954
Additions   302
Adjust to present value (668) (114)
Monetary variations 99,661 93,386
Payments (70,569) (64,365)
Accounts payable related to concession, ending R$ 612,587 R$ 584,163