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21. TAXES PAYABLE AND AMOUNTS TO BE REFUNDED TO CUSTOMERS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 02, 2019
 [1]
Dec. 31, 2018
Disclosure of taxes payable [line items]        
Current taxes payable R$ 506      
Non current Taxes payable 263      
Total tax payable 769      
Pasep and Cofins taxes to be reimbursed to customers 4,018      
Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable   R$ 411 [1] R$ 453 R$ 453
Non current Taxes payable   227 [1] R$ 249 249
Total tax payable   638    
Pasep and Cofins taxes to be reimbursed to customers   4,193    
ICMS [member]        
Disclosure of taxes payable [line items]        
Current taxes payable 112      
ICMS [member] | Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable   112   168
COFINS [member]        
Disclosure of taxes payable [line items]        
Current taxes payable [2] 184      
Non current Taxes payable [3] 216      
COFINS [member] | Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable [2]   177   182
Non current Taxes payable [3]   186   206
PIS/PASEP [member]        
Disclosure of taxes payable [line items]        
Current taxes payable [2] 41      
Non current Taxes payable [3] 47      
PIS/PASEP [member] | Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable [2]   39   39
Non current Taxes payable [3]   40   43
INSS [member]        
Disclosure of taxes payable [line items]        
Current taxes payable 29      
INSS [member] | Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable   25   23
Others [member]        
Disclosure of taxes payable [line items]        
Current taxes payable [4] 140      
Others [member] | Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable [4]   58   R$ 41
PIS/PASEP and COFINS [member]        
Disclosure of taxes payable [line items]        
Current taxes payable 448      
Non current Taxes payable R$ 3,570      
PIS/PASEP and COFINS [member] | Restated [member]        
Disclosure of taxes payable [line items]        
Current taxes payable      
Non current Taxes payable   R$ 4,193    
[1] For further details of restatement of comparative balances, see Note 2.8
[2] Includes Cofins and PIS/Pasep recognized in current liability includes the deferred taxes related to the interest revenue arising from the financing component in contract asset and to the revenue of construction and upgrade associated with the transmission concession contract, whose consideration will be received in at least twelve months after the reporting period. For more information, see note 2.8 and 15.
[3] The deferral of PIS/Pasep and Cofins taxes related to the interest revenue arising from the financing component in contract asset and to the revenue of construction and upgrade associated with the transmission concession contract, whose consideration will be received in at least twelve months after the reporting period. For more information, see note 2.8 and 15.
[4] This includes the withholding income tax on Interest on equity paid in January 2020, in accordance with the tax legislation.