XML 45 R115.htm IDEA: XBRL DOCUMENT v3.20.1
10 Accounts Receivables - Concessions (Details 5) - Generation Concession Agreements [Member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable Concessions [Line Items]    
Power generation concession contract at beginning R$ 65,811 R$ 68,859
Gain on remeasurement of the cash flow 426 1,247
Reversal of impairment 2,945 4,758
Transfers to other current receivables - disposal of assets   (9,053)
Power generation concession contract at ending R$ 69,182 R$ 65,811