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35 Financial Instruments (Details 9) - Risk Related To Price Of Power Purchase And Sale Transactions [Member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Increase [Member]  
Disclosure of detailed information about financial instruments [line items]  
Gains (losses) on purchase and sale of energy in active market, Price variation Increase
Gains (losses) on purchase and sale of energy in active market, Baseline R$ 208,662
Gains (losses) on purchase and sale of energy in active market, Projected Scenario Probable 192,103
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 1 270,953
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 2 R$ 349,803
Decrease [Member]  
Disclosure of detailed information about financial instruments [line items]  
Gains (losses) on purchase and sale of energy in active market, Price variation Decrease
Gains (losses) on purchase and sale of energy in active market, Baseline R$ 208,662
Gains (losses) on purchase and sale of energy in active market, Projected Scenario Probable 192,103
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 1 113,253
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 2 R$ 34,402