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10 Accounts Receivables - Concessions (Details 3) - Bonus From The Grant Of Concession Agreements Under The Quota System [Member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable Concessions [Line Items]    
Bonus from the grant, beginning R$ 625,772 R$ 606,479
Transfers to electricity grid use charges - customers (69,192) (66,693)
Interest 91,404 85,986
Bonus from the grant, ending R$ 647,984 R$ 625,772