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Financial Instruments and Risk Management - Schedule of Exchange Rate Risk (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial liabilities [line items]    
Net liabilities exposed R$ (2,097) R$ (4,249)
Foreign Currency Risk [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (434) (814)
Local Currency [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (2,097) (4,249)
Loan [Member] | Foreign Currency Risk [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (384) (762)
Loan [Member] | Local Currency [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (1,857) (3,975)
Suppliers (itaipu binacional) [member] | Foreign Currency Risk [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed (50) (52)
Suppliers (itaipu binacional) [member] | Local Currency [Member]    
Disclosure of financial liabilities [line items]    
Net liabilities exposed R$ (240) R$ (274)