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32 Operating Costs and Expenses (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals R$ 237,294    
Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals   R$ 260,051 R$ 281,104
Provision for litigations [member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals 150,269    
Provision for litigations [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals   243,848 206,792
Power generation concession contract [member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals (10,502)    
Power generation concession contract [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals   (2,945) (4,758)
Property plant and equipment generation segment [member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals (37,609)    
Property plant and equipment generation segment [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals   (117,744) (14,162)
Expected credit losses (trade accounts and other receivables) [member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals 128,466    
Expected credit losses (trade accounts and other receivables) [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals   140,348 83,453
Tax credits estimated losses [member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals (1,298)    
Tax credits estimated losses [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals   (3,456) 9,779
Provision for losses on equity interests [member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals R$ 7,968    
Provision for losses on equity interests [member] | Restated [Member]      
Disclosure of operating costs and expenses [line items]      
Credit losses, provisions and reversals