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33 Financial Results (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
FinancialResultLineItems [Line Items]      
Financial income R$ 750,241 R$ 813,915 R$ 699,310
Financial expenses 1,238,727 1,251,965 1,447,750
Financial result, net (488,486) (438,050) (748,440)
Arrears Charges On Bills [Member]      
FinancialResultLineItems [Line Items]      
Financial income 225,956 226,050 191,554
Interest And Monetary Variation Of CRC Transfer Expense [Member]      
FinancialResultLineItems [Line Items]      
Financial income 192,724 214,627 141,923
Return On Financial Investments [Member]      
FinancialResultLineItems [Line Items]      
Financial income 126,510 98,841 114,523
Recognition Of Tax Credit [Member]      
FinancialResultLineItems [Line Items]      
Financial income 38,434 55,096
Remuneration Of Net Sectorial Assets And Liabilities Expense [Member]      
FinancialResultLineItems [Line Items]      
Financial income 47,378 43,966 20,493
Monetary Variation Over The Ltaipu Power Purchase [Member]      
FinancialResultLineItems [Line Items]      
Financial income 26,332 24,658 17,777
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession [Member]      
FinancialResultLineItems [Line Items]      
Financial income 1,462 1,047 10,813
Other Financial Income [Member]      
FinancialResultLineItems [Line Items]      
Financial income 91,445 149,630 202,227
Monetary And Exchange Variation And Debt Charges [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses 906,952 871,397 993,970
Monetary Variation And Adjust To Present Value Of Accounts Payable Related To The Concession Expense [Member]r      
FinancialResultLineItems [Line Items]      
Financial expenses 100,455 94,319 65,418
Monetary Variation Over The Itaipu Power Purchase Expense [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses 29,547 50,203 12,264
Interest And Monetary Variation Of CRC Transfer [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses 8,495 25,830 51,211
Interest on R&D and EEP [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses 24,570 25,407 34,345
Remuneration Of Net Sectorial Assets And Liabilities [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses 5,753 23,747 29,622
PIS/Pasep/Cofins Taxes On Interest On Capital [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses 71,549 13,636 45,196
Other Financial Expenses [Member]      
FinancialResultLineItems [Line Items]      
Financial expenses R$ 91,406 R$ 147,426 R$ 215,724