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10. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 02, 2019
 [1]
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets R$ 4,323        
Deferred tax liabilities (2,910)        
Total, net 1,413        
Total assets 2,453        
Total liabilities (1,040)        
Revenues arising from transmission contract asset [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (768)     R$ (768)  
Tax loss carryforwards [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 401        
Provisions for contingencies [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 538        
Impairment on investments [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 640        
Fair value of derivative financial instruments (PUT SAAG ) [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 182        
Post employment obligations [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 2,168        
Estimated provision for doubtful receivables [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 256        
Others [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets 138        
Deferred tax liabilities (7)        
Funding cost [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (11)        
Deemed cost [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (225)        
Acquisition costs of equity interests [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (486)        
Borrowing costs capitalized [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (169)        
Adjustment to expectation of cash flow concession assets [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (242)        
Adjustment to fair value: swap/gains [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities (1,002)        
Restated [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   R$ 4,028   3,471  
Deferred tax liabilities   (2,368)   (2,127)  
Total, net R$ 1,413 1,660   1,344 R$ 1,072
Total assets   2,430 [1] R$ 2,147 2,147  
Total liabilities   (770) [1] R$ (803) (803)  
Restated [member] | Revenues arising from transmission contract asset [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   (624)   (627)  
Restated [member] | Tax loss carryforwards [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   116   373  
Restated [member] | Provisions for contingencies [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   544   218  
Restated [member] | Impairment on investments [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   660   882  
Restated [member] | Fair value of derivative financial instruments (PUT SAAG ) [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   164   143  
Restated [member] | Post employment obligations [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   2,090   1,477  
Restated [member] | Estimated provision for doubtful receivables [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   283   279  
Restated [member] | Others [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax assets   171   99  
Deferred tax liabilities   (5)   (38)  
Restated [member] | Funding cost [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   (16)   (25)  
Restated [member] | Deemed cost [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   (232)   (239)  
Restated [member] | Acquisition costs of equity interests [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   (503)   (501)  
Restated [member] | Borrowing costs capitalized [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   (166)   (168)  
Restated [member] | Adjustment to expectation of cash flow concession assets [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   (247)   (252)  
Restated [member] | Adjustment to fair value: swap/gains [member]          
Disclosure Of Income And Social Contribution Taxes Recoverable [line items]          
Deferred tax liabilities   R$ (575)   R$ (277)  
[1] For further details of restatement of comparative balances, see Note 2.8