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CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Concession Financial And Sector Assets And Liabilities      
Beginning balance R$ 2,097 R$ (98) R$ 882
Additions (386) 1,908 611
Amortization (761) 238 (156)
Payments from the Flag Tariff Centralizing Account     (63)
Receipt funds of ''Covid-account''     (1,404)
Updating - Selic rate (Note 31) 185 64 32
Transfer of other liabilities [1]   (15)  
Proceeds from loan - Water scarcity account (191)    
Ending balance R$ 944 R$ 2,097 R$ (98)
[1] Amounts relating to the reversal of the credits that could not be returned to customers in final billing, due to moderation of tariffs, as specified in §6 of Article 88 of REN 414/2010, included by REN 714/2016.