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16. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [abstract]      
Beginning balance R$ 1,080 R$ (46) R$ (407)
Additions 724 1,638 811
Amortization (666) 335 177
Others - R&D Reimbursement   (115)  
Payments from the Flag Tariff Centralizing Account (361) (794) (586)
Updating - Selic rate (Note 31) 105 62 (41)
Ending balance R$ 882 R$ 1,080 R$ (46)