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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, 2020
BRL (R$)
Increase [member]  
Disclosure of detailed information about financial instruments [line items]  
Gains (losses) on purchase and sale of energy in active market, Price variation Increase
Gains (losses) on purchase and sale of energy in active market, Baseline R$ 346,125
Gains (losses) on purchase and sale of energy in active market, Projected Scenario Probable 332,741
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 1 356,496
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 2 R$ 380,117
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$ 346,125
Gains (losses) on purchase and sale of energy in active market, Projected Scenario Probable 332,741
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 1 309,255
Gains (losses) on purchase and sale of energy in active market, Projected Scenario 2 R$ 285,635