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Nominal value and present value of accounts payable related to concession (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession R$ 903,959 R$ 731,864
Nominal Value [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 2,042,124  
Nominal Value [Member] | Twenty Twenty Two [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 109,102  
Nominal Value [Member] | Twenty Twenty Three [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 109,102  
Nominal Value [Member] | Twenty Twenty Four [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 109,102  
Nominal Value [Member] | Twenty Twenty Five [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 108,347  
Nominal Value [Member] | After Twenty Twenty Five [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 1,606,471  
Present Value [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 903,959  
Present Value [Member] | Twenty Twenty Two [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 104,963  
Present Value [Member] | Twenty Twenty Three [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 93,198  
Present Value [Member] | Twenty Twenty Four [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 84,128  
Present Value [Member] | Twenty Twenty Five [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession 75,371  
Present Value [Member] | After Twenty Twenty Five [Member]    
IfrsStatementLineItems [Line Items]    
Accounts payable related to concession R$ 546,299