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Financial Instruments and Risk Management - Schedule of Exposure to Exchange Rates (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Marketable securities (Note 7) | R$ 493 | R$ 774 |  |  |  |
Restricted cash | 235 | 31 |  |  |  |
Assets | 8,072 | 6,540 |  |  |  |
TOTAL ASSETS | 59,726 | 55,000 |  |  |  |
Liabilities |  |  |  |  |  |
Loans and financing (Note 21) - CDI | (12,280) | (9,831) | R$ (10,580) | R$ (11,364) |  |
CVA and Other financial components – SELIC (Note 12.4) | (16) |  |  | R$ 56 | R$ 42 | R$ 38
TOTAL LIABILITIES | (32,344) | (30,344) |  |  |  |
Net assets exposed | (2,565) | R$ (615) |  |  |  |
TJLP [member] | Book Value [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash equivalents (Note 6) | 1,629 |  |  |  |  |
Marketable securities (Note 7) | 493 |  |  |  |  |
Indenizacao a receber - Geracao (nota 12.2) | 871 |  |  |  |  |
Restricted cash | 235 |  |  |  |  |
Assets | 1,296 |  |  |  |  |
TOTAL ASSETS | 4,524 |  |  |  |  |
Liabilities |  |  |  |  |  |
Loans and financing (Note 21) - CDI | (4,882) |  |  |  |  |
CVA and Other financial components – SELIC (Note 12.4) | (16) |  |  |  |  |
TOTAL LIABILITIES | (4,898) |  |  |  |  |
Net assets exposed | (374) |  |  |  |  |
TJLP [member] | Probable Scenario [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash equivalents (Note 6) | 1,873 |  |  |  |  |
Marketable securities (Note 7) | 566 |  |  |  |  |
Indenizacao a receber - Geracao (nota 12.2) | 1,001 |  |  |  |  |
Restricted cash | 270 |  |  |  |  |
Assets | 1,490 |  |  |  |  |
TOTAL ASSETS | 5,200 |  |  |  |  |
Liabilities |  |  |  |  |  |
Loans and financing (Note 21) - CDI | (5,614) |  |  |  |  |
CVA and Other financial components – SELIC (Note 12.4) | (18) |  |  |  |  |
TOTAL LIABILITIES | (5,632) |  |  |  |  |
Net assets exposed | (432) |  |  |  |  |
Net effect of fluctuation in interest rates | (58) |  |  |  |  |
TJLP [member] | Adverse Scenario [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash equivalents (Note 6) | 1,877 |  |  |  |  |
Marketable securities (Note 7) | 568 |  |  |  |  |
Indenizacao a receber - Geracao (nota 12.2) | 941 |  |  |  |  |
Restricted cash | 271 |  |  |  |  |
Assets | 1,493 |  |  |  |  |
TOTAL ASSETS | 5,150 |  |  |  |  |
Liabilities |  |  |  |  |  |
Loans and financing (Note 21) - CDI | (5,627) |  |  |  |  |
CVA and Other financial components – SELIC (Note 12.4) |  |  |  |  |  |
TOTAL LIABILITIES | (5,627) |  |  |  |  |
Net assets exposed | (477) |  |  |  |  |
Net effect of fluctuation in interest rates | R$ (103) |  |  |  |  |

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