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Financial Instruments (Details 3) - Currency risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
BRL (R$)
IfrsStatementLineItems [Line Items]  
Financial liabilities, Baseline R$ (378,626)
Financial liabilities, projected probable (2,344)
Financial liabilities, projected scenario 1 (97,586)
Financial liabilities, projected scenario 2 R$ (192,829)
Itaip [Member]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD appreciation
Itaipu [Member]  
IfrsStatementLineItems [Line Items]  
Financial liabilities, Baseline R$ (284,930)
Financial liabilities, projected probable (1,764)
Financial liabilities, projected scenario 1 (73,437)
Financial liabilities, projected scenario 2 R$ (145,111)
Suppliers Acquisition Of Gas [Member]  
IfrsStatementLineItems [Line Items]  
Financial assets and liabilities risk USD appreciation
Financial liabilities, Baseline R$ (93,696)
Financial liabilities, projected probable (580)
Financial liabilities, projected scenario 1 (24,149)
Financial liabilities, projected scenario 2 R$ (47,718)