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27. REVENUE (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Jan. 02, 2019
 [2]
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
RevenueLineItems [Line Items]        
Revenue from supply of energy   R$ 26,432 R$ 26,927 R$ 24,872
Revenue from use of the electricity distribution systems (TUSD)   3,022    
CVA, and Other financial components   455    
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers - realization [1]   (266)    
Transmission operation and maintenance revenue   280    
Transmission construction revenue   201    
Interest revenue arising from the financing component in the transmission contract asset   438    
Generation assets - indemnity revenue      
Distribution construction revenue   1,436    
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession   16    
Revenue on financial updating of the Concession Grant Fee   347    
Energy transactions on the CCEE   154    
Mechanism for the sale of surplus   234    
Supply of gas   2,011    
Fine for violation of service continuity indicator   (51)    
Recovery of PIS/Pasep and Cofins (note 10)      
Other operating revenues   1,709 1,721 1,585
Deductions on revenue   (11,722)    
NET REVENUE   R$ 25,228 25,487 [2] 22,266
Restated [member]        
RevenueLineItems [Line Items]        
Revenue from supply of energy     26,928  
Revenue from use of the electricity distribution systems (TUSD)     2,722 2,045
CVA, and Other financial components     58 1,973
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers - realization [3]    
Transmission operation and maintenance revenue     352 343
Transmission construction revenue     312 138
Interest revenue arising from the financing component in the transmission contract asset     328 311
Generation assets - indemnity revenue     55
Distribution construction revenue     980 802
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession     18
Revenue on financial updating of the Concession Grant Fee     318 321
Energy transactions on the CCEE     432 217
Supply of gas     2,298 1,995
Fine for violation of service continuity indicator     (58) (44)
Recovery of PIS/Pasep and Cofins (note 10)     1,428
Other operating revenues     1,721 1,585
Deductions on revenue     (12,351) (12,314)
NET REVENUE R$ 22,299   R$ 25,486 [3],[4] R$ 22,299 [3]
[1] For more information, see note 9 from this financial statements.
[2] See note 2.8.
[3] For further details of restatement of comparative balances, see Note 2.8
[4] Recognition of the profit margin associated to the performance obligation to construct and upgrade the transmission infrastructure, as well as the interest revenue resulting from the financing component;