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Concession Financial and Sector Assets and Liabilities - Schedule of Changes in Balances of Sector Financial Assets and Liabilities (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Concession Financial and Sector Assets and Liabilities      
Beginning balance R$ 944 R$ 2,097 R$ (98)
Additions 416 (386) 1,908
Amortization (629) (761) 238
Transfer of other liabilities [1]     (15)
Proceeds from loan - Water scarcity account (343) (191)  
Updating - Selic rate (Note 29) 76 185 64
Ending balance R$ 464 R$ 944 R$ 2,097
[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.