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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)