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2. BASIS OF PREPARATION (Details1) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Apr. 30, 2021
Jan. 02, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CONTINUING OPERATIONS          
NET REVENUE     R$ 25,228 R$ 25,487 [1] R$ 22,266
TOTAL COST     (19,845)    
GROSS PROFIT     5,383    
OPERATING EXPENSES     (1,587)    
Share of profit (loss), net, of affiliates and jointly-controlled entities     357 125 [1] (104)
Dividends declared by investee classified as held for sale        
Remeasurement of previously held equity interest in subsidiaries acquired       (119)
Impairment loss on investments       (127)
Net finance income     2,445 3,207 [1] 1,706
Income before income tax and social contribution tax     3,801 4,469 [1] 2,011
Current income tax and social contribution tax     (684)    
Deferred income tax and social contribution tax     (252)    
Net income for the year from continuing operations     2,865 2,969 [1] 1,401 [1]
DISCONTINUED OPERATIONS          
Net income after tax for the year from discontinued operations     224 [1] 363 [1]
NET INCOME FOR THE YEAR R$ 2,864   2,865 3,194 [1] 1,764 [1]
Equity holders of the parent          
Net income from continuing operations     2,864    
Net income for the year attributed to equity holders of the parent     2,864    
Non-controlling interests          
Net income from continuing operations     1    
NET INCOME FOR THE YEAR     R$ 1 1 [1] 42
Basic and diluted earnings per preferred share - R$     R$ 1.69    
Basic and diluted earnings per common share - R$     1.69    
Basic and diluted earnings per preferred share from continuing operations - R$     1.69    
Basic and diluted earnings per common share from continuing operations - R$     1.69    
Basic and diluted earnings per preferred share from discontinued operations - R$        
Basic and diluted earnings per common share from discontinued operations - R$        
As presented [member]          
CONTINUING OPERATIONS          
NET REVENUE [2]   R$ 22,266   25,390  
TOTAL COST   (17,677)   (19,598)  
GROSS PROFIT   4,589   5,792  
OPERATING EXPENSES [3]   (1,743)   (2,881)  
Share of profit (loss), net, of affiliates and jointly-controlled entities   (104)   125  
Dividends declared by investee classified as held for sale       73  
Remeasurement of previously held equity interest in subsidiaries acquired   (119)    
Impairment loss on investments   (127)    
Net finance income   (518)   1,360  
Income before income tax and social contribution tax   1,978   4,469  
Current income tax and social contribution tax   (583)   (1,454)  
Deferred income tax and social contribution tax [4]   (16)   (111)  
Net income for the year from continuing operations   1,379   2,904 1,379
DISCONTINUED OPERATIONS          
Net income after tax for the year from discontinued operations   363   224 363
NET INCOME FOR THE YEAR   1,742   3,128 1,742
Equity holders of the parent          
Net income from continuing operations   1,378   2,903  
Net income from discontinued operations   322   224  
Net income for the year attributed to equity holders of the parent   1,700   3,127  
Non-controlling interests          
Net income from continuing operations   1   1  
Net income from discontinued operations   41    
NET INCOME FOR THE YEAR   R$ 1,742   R$ 3,128  
Basic and diluted earnings per preferred share - R$ [5]   R$ 1.17   R$ 2.06  
Basic and diluted earnings per common share - R$ [5]   1.17   2.06  
Basic and diluted earnings per preferred share from continuing operations - R$ [5]   0.95   1.91  
Basic and diluted earnings per common share from continuing operations - R$ [5]   0.95   1.91  
Basic and diluted earnings per preferred share from discontinued operations - R$ [5]   0.22   0.15  
Basic and diluted earnings per common share from discontinued operations - R$ [5]   R$ 0.22   R$ 0.15  
Adjustment [member]          
CONTINUING OPERATIONS          
NET REVENUE [2]   R$ 33   R$ 96  
GROSS PROFIT   33   96  
OPERATING EXPENSES [3]     5  
Share of profit (loss), net, of affiliates and jointly-controlled entities      
Dividends declared by investee classified as held for sale        
Remeasurement of previously held equity interest in subsidiaries acquired      
Impairment loss on investments      
Net finance income      
Income before income tax and social contribution tax   33   101  
Current income tax and social contribution tax        
Deferred income tax and social contribution tax [4]   (11)   (34)  
Net income for the year from continuing operations   22   65 22
DISCONTINUED OPERATIONS          
Net income after tax for the year from discontinued operations    
NET INCOME FOR THE YEAR   22   65 22
Equity holders of the parent          
Net income from continuing operations   22   67  
Net income from discontinued operations      
Net income for the year attributed to equity holders of the parent   22   67  
Non-controlling interests          
Net income from continuing operations      
Net income from discontinued operations      
NET INCOME FOR THE YEAR   R$ 22   R$ 65  
Basic and diluted earnings per preferred share - R$ [5]   R$ (0.15)   R$ 0.17  
Basic and diluted earnings per common share - R$ [5]   (0.15)   0.17  
Basic and diluted earnings per preferred share from continuing operations - R$ [5]   (0.12)   0.14  
Basic and diluted earnings per common share from continuing operations - R$ [5]   (0.12)   0.14  
Basic and diluted earnings per preferred share from discontinued operations - R$ [5]   (0.03)   0.01  
Basic and diluted earnings per common share from discontinued operations - R$ [5]   R$ (0.03)   R$ 0.01  
Restated [member]          
CONTINUING OPERATIONS          
NET REVENUE   R$ 22,299 [1]   R$ 25,486 [2],[6] 22,299 [6]
TOTAL COST   (17,677) [1]   (19,598) [6] (17,677) [6]
GROSS PROFIT   4,622 [1]   5,888 [6] 4,622 [6]
OPERATING EXPENSES   (1,743) [1]   (2,876) [3],[6] (1,743) [6]
Share of profit (loss), net, of affiliates and jointly-controlled entities   (104) [1]   125 [6] (104) [6]
Dividends declared by investee classified as held for sale [6]       (73)
Remeasurement of previously held equity interest in subsidiaries acquired   (119) [1]   [6] (119) [6]
Impairment loss on investments   (127) [1]   [6] (127) [6]
Net finance income [1]   (518)   1,360  
Income before income tax and social contribution tax   2,011 [1]   4,570 [6] 2,011 [6]
Current income tax and social contribution tax   (583) [1]   (1,454) [6] (583) [6]
Deferred income tax and social contribution tax   (27) [1]   (145) [5],[6] (27) [6]
Net income for the year from continuing operations   1,401 [1]   2,971 [6] 1,401 [6]
DISCONTINUED OPERATIONS          
Net income after tax for the year from discontinued operations   363 [1]   224 [6] 363 [6]
NET INCOME FOR THE YEAR   1,764 [1]   3,195 [6] 1,764 [6]
Equity holders of the parent          
Net income from continuing operations   1,400 [1]   2,970 [6] 1,400 [6]
Net income from discontinued operations   322 [1]   224 [6] 322 [6]
Net income for the year attributed to equity holders of the parent   1,722 [1]   3,194 [6] 1,722 [6]
Non-controlling interests          
Net income from continuing operations   1 [1]   1 [6] 1 [6]
Net income from discontinued operations   41 [1]   [6] 41 [6]
NET INCOME FOR THE YEAR   R$ 42 [1]   R$ 1 [6] R$ 42 [6]
Basic and diluted earnings per preferred share - R$   R$ 1.02 [5]   R$ 1.89 [6] R$ 1.02 [6]
Basic and diluted earnings per common share - R$   1.02 [5]   1.89 [6] 1.02 [6]
Basic and diluted earnings per preferred share from continuing operations - R$   0.83 [5]   1.75 [6] 0.83 [6]
Basic and diluted earnings per common share from continuing operations - R$   0.83 [5]   1.75 [6] 0.83 [6]
Basic and diluted earnings per preferred share from discontinued operations - R$   0.19 [5]   0.14 [5],[6] 0.19 [6]
Basic and diluted earnings per common share from discontinued operations - R$   R$ 0.19 [5]   R$ 0.14 [6] R$ 0.19 [6]
[1] See note 2.8.
[2] 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;
[3] Reversal of expected losses recorded in others expenses in prior periods.
[4] Deferral of income tax and social contribution tax over the adjustments
[5] The basic and diluted earnings per share for the years ended in December 31, 2019 and 2018 were also adjusted retrospectively in order to reflect the increase in the number of shares in 2021. For more information, see Note 26.
[6] For further details of restatement of comparative balances, see Note 2.8