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10 Accounts Receivables - Concessions (Details 4) - Remeasurement Of RBSE Financial Assets [Member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable Concessions [Line Items]    
Remeasurement of RBSE financial assets, beginning R$ 753,826 R$ 1,418,370
Gain on remeasurement of the cash flow from the RBSE assets 90,346 (635,292)
Increase in the estimated amount due to the approval of the report on RBSE assets   82,640
Transfers to electricity grid use charges - customers (104,902) (111,892)
Remeasurement of RBSE financial assets, ending R$ 739,270 R$ 753,826