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26 Accounts Payable Related to Concessions (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession R$ 612,587 R$ 584,163 R$ 554,954
Present value [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 612,587    
Present value [Member] | 2020 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 73,032    
Present value [Member] | 2021 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 64,387    
Present value [Member] | 2022 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 58,128    
Present value [Member] | 2023 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 52,482    
Present value [Member] | After 2023 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 364,558    
Nominal value [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 1,309,938    
Nominal value [Member] | 2020 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 71,471    
Nominal value [Member] | 2021 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 71,471    
Nominal value [Member] | 2022 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 71,471    
Nominal value [Member] | 2023 [Member]      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 71,471    
Nominal value [Member] | After 2023      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession R$ 1,024,054