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Financial Instruments and Risk Management - Schedule of Net Assets Exposure to Exchange Rates (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash equivalents - Cash investments (Note 6) - CDI | R$ 1,629 | R$ 1,342 |  |
Marketable securities (Note 7) - CDI / SELIC | 493 | 774 |  |
Restricted Cash and Cash Equivalents | 235 | 31 |  |
Assets | 8,072 | 6,540 |  |
Assets | 59,726 | 55,000 |  |
Liabilities |  |  |  |
Loans, financing and debentures (Note 22) - CDI | (12,280) | (9,831) | R$ (10,580) | R$ (11,364)
Sector financial liabilities (Note 14) | (14,145) | (13,093) |  |
Net assets exposed | (2,565) | (615) |  |
Domestic Currency [Member] |  |  |  |
Assets |  |  |  |
Cash equivalents - Cash investments (Note 6) - CDI | 1,629 | 1,342 |  |
Marketable securities (Note 7) - CDI / SELIC | 493 | 774 |  |
Generation indemnity revenue | 871 | 784 |  |
Restricted Cash and Cash Equivalents | 235 | 31 |  |
Assets | 1,296 | 806 |  |
Assets | 4,524 | 3,737 |  |
Liabilities |  |  |  |
Loans, financing and debentures (Note 22) - CDI | (4,882) | (3,508) |  |
Sector financial liabilities (Note 14) | (16) |  |  |
Liabilities | (4,898) | (3,508) |  |
Net assets exposed | R$ (374) | R$ (229) |  |

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