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30 Equity (Details)
Dec. 31, 2020
shares
Disclosure of classes of share capital [line items]  
Number of shares 2,736,553,750
Percent 100.00%
Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,450,310,800
Percent 100.00%
Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,282,975,430
Percent 100.00%
Class "A" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 3,267,520
Percent 100.00%
State of parana [member]  
Disclosure of classes of share capital [line items]  
Number of shares 850,285,980
Percent 31.07%
State of parana [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 850,285,980
Percent 58.63%
BNDES [member]  
Disclosure of classes of share capital [line items]  
Number of shares 655,807,810
Percent 23.96%
BNDES [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 382,987,750
Percent 26.41%
BNDES [member] | Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 272,820,060
Percent 21.26%
Eletrobras [member]  
Disclosure of classes of share capital [line items]  
Number of shares 15,307,740
Percent 0.56%
Eletrobras [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 15,307,740
Percent 1.06%
Free float: B3 [member]  
Disclosure of classes of share capital [line items]  
Number of shares 972,748,740
Percent 35.56%
Free float: B3 [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 197,200,880
Percent 13.59%
Free float: B3 [member] | Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 774,780,030
Percent 60.40%
Free float: B3 [member] | Class "A" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 767,830
Percent 23.50%
Free float: NYSE [member]  
Disclosure of classes of share capital [line items]  
Number of shares 234,311,920
Percent 8.56%
Free float: NYSE [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,163,450
Percent 0.08%
Free float: NYSE [member] | Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 233,148,470
Percent 18.17%
Free Float: Latibex [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,721,110
Percent 0.06%
Free Float: Latibex [member] | Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,721,110
Percent 0.13%
City halls [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,911,900
Percent 0.07%
City halls [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,783,930
Percent 0.12%
City halls [member] | Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 34,710
City halls [member] | Class "A" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 93,260
Percent 2.85%
Other shareholders [member]  
Disclosure of classes of share capital [line items]  
Number of shares 4,458,550
Percent 0.16%
Other shareholders [member] | Common [member]  
Disclosure of classes of share capital [line items]  
Number of shares 1,581,070
Percent 0.11%
Other shareholders [member] | Class "B" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 471,050
Percent 0.04%
Other shareholders [member] | Class "A" preferred [member]  
Disclosure of classes of share capital [line items]  
Number of shares 2,406,430
Percent 73.65%