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RECEIVABLES FROM CUSTOMERS (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets R$ 820 R$ 833
Residential [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 272 221
Industrial [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 168 185
Commercial, services and others [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 203 220
Rural [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 33 34
Public authorities [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 28 45
Public lighting [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 1 2
Public services [member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 33 38
Network Fees [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets R$ 82 R$ 88