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14. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [abstract]      
Beginning balance R$ 882 R$ 1,080 R$ (46)
Additions 611 724 1,638
Amortization (156) (666) 335
Others - R&D Reimbursement     (115)
Payments from the Flag Tariff Centralizing Account (63) (361) (794)
Receipt funds of ''Covid-account'' [1] (1,404)    
Updating - Selic rate (Note 31) 32 105 62
Ending balance R$ (98) R$ 882 R$ 1,080
[1] The amount received via 'Covid-account' will be reversed in a negative financial component in the 2021 or 2022 tariff processes, as detailed in note 1.