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Operating Costs and Expenses - Schedule of Other Costs and Expenses, Net (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total R$ 504 R$ 396 R$ 394
Leasing and Rentals [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 3 16 6
Advertising [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 14 9 12
Own Consumption [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 23 24 28
Subsidies and Donations [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 29 26 27
Paid Concessions [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 4 4 4
Insurance [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 22 24 29
Forluz Administrative Running Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 40 36 32
CCEE Annual Charge [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 7 6 5
Collecting Agents [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 72 77 86
Net Loss (Gain) on Deactivation and Disposal of Assets [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 210 127 99
Obligations Deriving from Investment Contracts [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 3 3 11
Taxes (IPTU, IPVA and other) [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 10 8 16
Other and Reversals [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total [1] R$ 67 R$ 36 R$ 39
[1] The following expenses were recognized in 2023, posted in Other operational expenses: a regulatory fine of R$11 resulting from an ANEEL inspection in 2019 to check the procedures and criteria adopted by the Company in application of the conditions required by regulations established for Micro- and Mini-Distributed Generation; and financial compensation totaling R$85 for delay in the commercial services arising from alterations in ANEEL Normative Resolution 1000 of December 7, 2021.