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27. REVENUE (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of revenue [line items]      
Taxes on revenues R$ 8,798    
Charges to the consumer 2,924    
Deductions from revenue 11,722    
Restated [member]      
Disclosure of revenue [line items]      
Taxes on revenues   R$ 9,297 R$ 8,767
Charges to the consumer   3,054 3,547
Deductions from revenue   12,351 12,314
Research and Development (R&D) [member]      
Disclosure of revenue [line items]      
Charges to the consumer 43    
Research and Development (R&D) [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   41 38
National Scientific and Technological Development Fund (FNDCT) [member]      
Disclosure of revenue [line items]      
Charges to the consumer 43    
National Scientific and Technological Development Fund (FNDCT) [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   41 38
Customer charges - Proinfa alternative sources program [member]      
Disclosure of revenue [line items]      
Charges to the consumer 39    
Customer charges - Proinfa alternative sources program [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   52 40
Other Taxes [member]      
Disclosure of revenue [line items]      
Taxes on revenues 5    
Other Taxes [member] | Restated [member]      
Disclosure of revenue [line items]      
Taxes on revenues   7 8
Pis and pasep tax [member]      
Disclosure of revenue [line items]      
Taxes on revenues 481    
Pis and pasep tax [member] | Restated [member]      
Disclosure of revenue [line items]      
Taxes on revenues   524 553
ICMS [member]      
Disclosure of revenue [line items]      
Taxes on revenues 6,098    
ICMS [member] | Restated [member]      
Disclosure of revenue [line items]      
Taxes on revenues   6,358 5,657
Cofins [member]      
Disclosure of revenue [line items]      
Taxes on revenues 2,214    
Cofins [member] | Restated [member]      
Disclosure of revenue [line items]      
Taxes on revenues   2,408 2,549
Energy services inspection fee [member]      
Disclosure of revenue [line items]      
Charges to the consumer 35    
Energy services inspection fee [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   30 26
Customer charges - the 'Flag Tariff' system [member]      
Disclosure of revenue [line items]      
Charges to the consumer 149    
Customer charges - the 'Flag Tariff' system [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   294 655
Royalties for use of water resources [member]      
Disclosure of revenue [line items]      
Charges to the consumer 62    
Royalties for use of water resources [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   43 45
Energy System Expansion Research (EPE of MME) [member]      
Disclosure of revenue [line items]      
Charges to the consumer 21    
Energy System Expansion Research (EPE of MME) [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   20 19
Energy Development Account (CDE) [member]      
Disclosure of revenue [line items]      
Charges to the consumer 2,443    
Energy Development Account (CDE) [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   2,448 2,603
Energy Efficiency Program (PEE) [member]      
Disclosure of revenue [line items]      
Charges to the consumer 73    
Energy Efficiency Program (PEE) [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   69 64
Global Reversion Reserve (RGR) [member]      
Disclosure of revenue [line items]      
Charges to the consumer R$ 16    
Global Reversion Reserve (RGR) [member] | Restated [member]      
Disclosure of revenue [line items]      
Charges to the consumer   R$ 16 R$ 19