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16. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details Narrative)
R$ in Millions
 12 Months Ended
Aug. 31, 2018
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Plant
Dec. 31, 2017
BRL (R$)
Aug. 16, 2016
BRL (R$)
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Homologated amount         R$ 892
Remuneration payment period       8 years  
Extensions of concessions, tariff maximum amount   R$ 833 R$ 937    
Extension of the concessions   448 359    
Net balance of assets deemed cost   R$ 816 816    
Grant acquisition period   30 years      
Pass-throughs of funds   R$ 361 794 R$ 586  
Aneel [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Percentage of regulatory load   105.00%      
Receivable asset   R$ 216,852      
Assets Related To Infrastructure [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Financial assets   5,049 4,917    
Transmission Indemnity Receivable [Member] | Assets Related To Infrastructure [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Financial assets   1,281 R$ 1,296    
Hydro Electric Plant [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Number of plants | Plant     18    
Cost of acquisition   2,216      
Usina Hidreletrica Miranda [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Net balance of assets deemed cost [1]   23      
Usina Hidreletrica Jaguara [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Net balance of assets deemed cost [1]   174      
Usina Hidreletrica Sao Simao [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Net balance of assets deemed cost [1]   R$ 3      
Sao Simao and Miranda Plants [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Generation - Indemnity receivable R$ 1,139        
Other Disposals Of Assets [Member] | Free Market [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Output sales percentage   30.00%      
Other Disposals Of Assets [Member] | Regulated Market [Member]          
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]          
Output sales percentage   70.00%      
[1] Investments made after the Jaguara, Sao Simao and Miranda plants came into operation, in the amounts of R$174, R$3 and R$23, respectively, are recorded as concession financial assets, and the determination of the final amounts to be paid to the Company is in a process of discussion with Aneel (the regulator). Company does not expect losses in realization of these amounts.