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Financial Instruments (Details 3) - Currency risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
BRL (R$)
IfrsStatementLineItems [Line Items]  
Financial liabilities, Baseline R$ (194,730)
Financial liabilities, projected probable (3,166)
Financial liabilities, projected scenario 1 (52,639)
Financial liabilities, projected scenario 2 R$ (102,113)
Itaipu [Member]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (194,730)
Financial liabilities, projected probable (3,166)
Financial liabilities, projected scenario 1 (52,639)
Financial liabilities, projected scenario 2 R$ (102,113)