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Financial Instruments and Risk Management - Schedule of Net Assets Exposure to Exchange Rates (Details)
R$ in Millions, $ in Millions
Dec. 31, 2023
BRL (R$)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
BRL (R$)
Assets          
Cash equivalents - Cash investments (Note 6) - CDI R$ 1,342   R$ 1,346    
Marketable securities (Note 7) - CDI / SELIC 774   1,879    
Assets 6,540   5,993    
Assets 55,000   53,671    
Liabilities          
Loans, financing and debentures (Note 22) - CDI (9,831) $ (1,857) (10,580) R$ (11,364) R$ (15,020)
Sector financial liabilities (Note 14) (13,093)   (11,203)    
Net assets exposed (615)   (1,423)    
Domestic Currency [Member]          
Assets          
Cash equivalents - Cash investments (Note 6) - CDI 1,342   1,345    
Marketable securities (Note 7) - CDI / SELIC 774   1,878    
Generation indemnity revenue 784   691    
Restricted cash - CDI 31   16    
Assets 806   944    
Assets 3,737   4,874    
Liabilities          
Loans, financing and debentures (Note 22) - CDI (3,508)   (2,041)    
Liabilities (3,508)   (2,041)    
Net assets exposed R$ 229   R$ 2,833