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Financial Instruments and Risk Management - Schedule of Exchange Rate Risk (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial liabilities [line items]    
Net liabilities exposed R$ 210 R$ 2,097
Foreign Currency Risk [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (34) (434)
Local Currency [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (210) (2,097)
Loan [Member] | Foreign Currency Risk [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (384)
Loan [Member] | Local Currency [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (1,857)
Suppliers (itaipu binacional) [member] | Foreign Currency Risk [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (34) (50)
Suppliers (itaipu binacional) [member] | Local Currency [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed R$ (210) R$ (240)