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Suppliers - Schedule of Suppliers (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Suppliers  R$ 3,017 R$ 2,832
Energy Purchased For Resale [Member]    
IfrsStatementLineItems [Line Items]    
Suppliers  1,250 1,162
Energy On Spot Market [Member]    
IfrsStatementLineItems [Line Items]    
Suppliers  135 110
Charges Energy Network [Member]    
IfrsStatementLineItems [Line Items]    
Suppliers  246 207
Itaipu Binacional [Member]    
IfrsStatementLineItems [Line Items]    
Suppliers  240 274
Gas Purchased For Resale [Member]    
IfrsStatementLineItems [Line Items]    
Suppliers  204 278
Materials And Services [Member]    
IfrsStatementLineItems [Line Items]    
Suppliers  R$ 942 R$ 801