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35. Financial Instruments (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Exposure to credit risk R$ 10,183,532 R$ 11,014,971
Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 1,948,409 1,040,075
Bonds and securities    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 344,296 219,663
Pledges and restricted deposits linked    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 89,758 135,037
Trade accounts receivable    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 3,107,006 2,994,322
CRC Transferred to the State Government of Paraná    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 1,445,042 1,516,362
Sectorial financial assets    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 678,819 343,218
Accounts receivable related to the concession    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 1,859,108 3,903,643
Accounts receivable related to the concession - bonus from the grant    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 625,772 606,479
Accounts receivable related to the concession compensation    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 65,811 68,859
State of Paraná - Government Programs    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 0 130,417
Mutual Related Parties    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk 0 38,169
Other temporary investments    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk R$ 19,511 R$ 18,727