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Operating Costs and Expenses - Schedule of Other Costs and Expenses, Net (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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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.

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