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Schedule of provision for allowance for doubtful accounts (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets R$ 833 R$ 712
Residential [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 221 110
Industrial [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 185 188
Commercial Services And Other [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 220 190
Rural [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 34 30
Public Authorities [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 45 83
Public Lighting [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 2 2
Public Service [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets 38 35
Network Fees [Member]    
IfrsStatementLineItems [Line Items]    
Allowance account for credit losses of financial assets R$ 88 R$ 74