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Schedule of suppliers (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
 Suppliers R$ 2,683 R$ 2,358
Energy On Spot Market [Member]    
IfrsStatementLineItems [Line Items]    
 Suppliers 130 490
Charges Energy Network [Member]    
IfrsStatementLineItems [Line Items]    
 Suppliers 175 192
Energy Purchased For Resale [Member]    
IfrsStatementLineItems [Line Items]    
 Suppliers 1,314 808
Itaipu Binacional [Member]    
IfrsStatementLineItems [Line Items]    
 Suppliers 331 325
Gas Purchased For Resale [Member]    
IfrsStatementLineItems [Line Items]    
 Suppliers 228 127
Materials And Services [Member]    
IfrsStatementLineItems [Line Items]    
 Suppliers R$ 505 R$ 416