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30 Equity (Details)
Dec. 31, 2019
shares
Disclosure of classes of share capital [line items]  
Number of shares 273,655,375
Percent 10000.00%
Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 145,031,080
Percent 10000.00%
Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 128,297,153
Percent 10000.00%
Class "A" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 327,142
Percent 10000.00%
State of Parana [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 85,028,598
Percent 3107.00%
State of Parana [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 85,028,598
Percent 5863.00%
BNDES [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 65,580,781
Percent 2396.00%
BNDES [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 38,298,775
Percent 2641.00%
BNDES [Member] | Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 27,282,006
Percent 2126.00%
Eletrobras [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,530,774
Percent 56.00%
Eletrobras [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,530,774
Percent 1.06%
Free Float: NYSE [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 27,289,828
Percent 997.00%
Free Float: NYSE [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 108,545
Percent 7.00%
Free Float: NYSE [Member] | Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 27,181,283
Percent 2119.00%
Free Float: Latibex [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 170,911
Percent 6.00%
Free Float: Latibex [Member] | Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 170,911
Percent 13.00%
Other Shareholders [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 445,926
Percent 16.00%
Other Shareholders [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 158,166
Percent 11.00%
Other Shareholders [Member] | Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 46,727
Percent 4.00%
Other Shareholders [Member] | Class "A" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 241,033
Percent 7368.00%
Free Float: B3 [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 93,417,367
Percent 3415.00%
Free Float: B3 [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 19,727,829
Percent 1360.00%
Free Float: B3 [Member] | Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 73,612,755
Percent 5738.00%
Free Float: B3 [Member] | Class "A" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 76,783
Percent 2347.00%
City Halls [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 191,190
Percent 7.00%
City Halls [Member] | Common [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 178,393
Percent 12.00%
City Halls [Member] | Class "B" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 3,471
City Halls [Member] | Class "A" Preferred [Member]  
Disclosure of classes of share capital [line items]  
Number of shares 9,326
Percent 285.00%