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30. Equity (Details)
Dec. 31, 2018
shares
Disclosure of classes of share capital [line items]  
Number of shares 273,655,375
Percent 100.00%
Common  
Disclosure of classes of share capital [line items]  
Number of shares 145,031,080
Percent 100.00%
Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 328,627
Percent 100.00%
Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 128,295,668
Percent 100.00%
State of Paraná  
Disclosure of classes of share capital [line items]  
Number of shares 85,028,598
Percent 31.07%
State of Paraná | Common  
Disclosure of classes of share capital [line items]  
Number of shares 85,028,598
Percent 58.63%
State of Paraná | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
State of Paraná | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
BNDES  
Disclosure of classes of share capital [line items]  
Number of shares 65,580,781
Percent 23.96%
BNDES | Common  
Disclosure of classes of share capital [line items]  
Number of shares 38,298,775
Percent 26.41%
BNDES | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
BNDES | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 27,282,006
Percent 21.26%
Eletrobrás  
Disclosure of classes of share capital [line items]  
Number of shares 1,530,774
Percent 0.56%
Eletrobrás | Common  
Disclosure of classes of share capital [line items]  
Number of shares 1,530,774
Percent 1.06%
Eletrobrás | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
Eletrobrás | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
Free float: B3  
Disclosure of classes of share capital [line items]  
Number of shares 89,045,997
Percent 32.54%
Free float: B3 | Common  
Disclosure of classes of share capital [line items]  
Number of shares 19,186,634
Percent 13.23%
Free float: B3 | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 76,763
Percent 23.36%
Free float: B3 | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 69,782,600
Percent 54.39%
Free float: NYSE  
Disclosure of classes of share capital [line items]  
Number of shares 31,622,812
Percent 11.56%
Free float: NYSE | Common  
Disclosure of classes of share capital [line items]  
Number of shares 649,508
Percent 0.45%
Free float: NYSE | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
Free float: NYSE | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 30,973,304
Percent 24.15%
Free float: Latibex  
Disclosure of classes of share capital [line items]  
Number of shares 208,846
Percent 0.08%
Free float: Latibex | Common  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
Free float: Latibex | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 0
Percent 0.00%
Free float: Latibex | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 208,846
Percent 0.16%
Municipalities  
Disclosure of classes of share capital [line items]  
Number of shares 191,190
Percent 0.07%
Municipalities | Common  
Disclosure of classes of share capital [line items]  
Number of shares 178,393
Percent 0.12%
Municipalities | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 9,326
Percent 2.84%
Municipalities | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 3,471
Percent 0.00%
Other shareholders  
Disclosure of classes of share capital [line items]  
Number of shares 446,377
Percent 0.16%
Other shareholders | Common  
Disclosure of classes of share capital [line items]  
Number of shares 158,398
Percent 0.10%
Other shareholders | Class "A" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 242,538
Percent 73.80%
Other shareholders | Class "B" Preferred  
Disclosure of classes of share capital [line items]  
Number of shares 45,441
Percent 0.04%