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2. BASIS OF PREPARATION (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Jan. 02, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOW FROM OPERATIONS        
Net income for the year from continuing operations   R$ 2,865 R$ 2,969 [1] R$ 1,401 [1]
Net income for the year from discontinuing operations   224 [1] 363 [1]
Adjustments to reconcile net income to net cash flows:        
Deferred income tax and social contribution tax   252    
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets   39    
Others   57    
TOTAL   3,968    
Increase (decrease) in liabilities        
Others   106    
TOTAL   (1,676)    
Increase (decrease) in liabilities   (1,676)    
Cash generated by operating activities   R$ 8,607    
As presented [member]        
CASH FLOW FROM OPERATIONS        
Net income for the year from continuing operations R$ 1,379   2,904 1,379
Net income for the year from discontinuing operations 363   224 363
Adjustments to reconcile net income to net cash flows:        
Deferred income tax and social contribution tax     111 [2] 16 [3]
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets [4]     130  
Adjustment to expectation of contract asset and financial concession asset     (507) [2] (585) [5]
Deffered PIS/Pasep and Cofins over contract revenues [6]     985
Others     1,072  
TOTAL     3,934 2,158
Increase (decrease) in liabilities        
Concession contract and financial assets     373 [7] 1,704 [6]
Others     (67) 1,450
TOTAL     957 (2,023)
Increase (decrease) in liabilities     957 (2,023)
Cash generated by operating activities     5,197 3,289
Adjustment [member]        
CASH FLOW FROM OPERATIONS        
Net income for the year from continuing operations 22   65 22
Net income for the year from discontinuing operations  
Adjustments to reconcile net income to net cash flows:        
Deferred income tax and social contribution tax     34 [2] 11 [3]
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets [4]     (5)  
Adjustment to expectation of contract asset and financial concession asset     (249) [2] (92) [5]
Deffered PIS/Pasep and Cofins over contract revenues [6]     15 2
Others      
TOTAL     (138) (57)
Increase (decrease) in liabilities        
Concession contract and financial assets     138 [7] 57 [6]
Others      
TOTAL     138  
Increase (decrease) in liabilities     138  
Cash generated by operating activities     136 57
Restated [member]        
CASH FLOW FROM OPERATIONS        
Net income for the year from continuing operations 1,401 [1]   2,971 [8] 1,401 [8]
Net income for the year from discontinuing operations R$ 363 [1]   224 [8] 363 [8]
Adjustments to reconcile net income to net cash flows:        
Deferred income tax and social contribution tax [8]     145 27
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets [8]     125 61
Adjustment to expectation of contract asset and financial concession asset     (756) [2] (677) [5]
Deffered PIS/Pasep and Cofins over contract revenues [6]     15 987
Others [8]     (9) (28)
TOTAL [8]     444 3,211
Increase (decrease) in liabilities        
Concession contract and financial assets     511 [7] 1,761 [6]
Others [8]     4 (165)
TOTAL [8]     (957) 2,023
Increase (decrease) in liabilities [8]     (957) 2,023
Cash generated by operating activities [8]     R$ 2,036 R$ 1,008
[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 and the result of the periodic tariff revision.
[3] Deferral of income tax and social contribution tax over the adjustments.
[4] Others immaterial adjustments referring to impairment losses and others expected losses.
[5] 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 in the contract asset and the result of the periodic tariff revision.
[6] Effects of PIS/Pasep and Cofins over contract revenues, including the deferred taxes.
[7] Adjustments in the amounts of the contract assets that were received, due to the reallocation of the consideration to performance obligation to construct and upgrade.
[8] For further details of restatement of comparative balances, see Note 2.8