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27. Accounts Payable Related to Concessions (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession R$ 584,163 R$ 554,954 R$ 565,542
Nominal value      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 1,296,180    
Nominal value | 2019      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 68,001    
Nominal value | 2020      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 66,754    
Nominal value | 2021      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 66,754    
Nominal value | 2022      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 66,754    
Nominal value | After 2022      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 1,027,917    
Present value      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 584,163    
Present value | 2019      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 67,858    
Present value | 2020      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 60,138    
Present value | 2021      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 54,296    
Present value | 2022      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession 49,025    
Present value | After 2022      
DisclosureOfAccountsPayableRelatedToConcessionsLineItems [Line Items]      
Accounts payable related to concession R$ 352,846