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Schedule of allowance for doubtful accounts (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets R$ 304,601 R$ 365,551 R$ 376,756 R$ 331,388
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 182,241 127,896 162,477  
Reversal, allowance account for credit losses of financial assets (243,302) (136,603) (117,109)  
[custom:ReclassificationAllowanceAccountForCreditLossesOfFinancialAssets] [1] 111 (2,498)    
Customers [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 155,288 213,096 218,989 186,258
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 180,586 123,657 136,514  
Reversal, allowance account for credit losses of financial assets (238,394) (129,550) (103,783)  
Customers [Member] | Residential [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 50,268 47,396 41,824 21,722
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 117,928 65,937 71,794  
Reversal, allowance account for credit losses of financial assets (115,056) (60,365) (51,692)  
Customers [Member] | Industrial [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 42,431 88,866 97,954 87,197
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 20,413 22,487 33,772  
Reversal, allowance account for credit losses of financial assets (66,848) (31,575) (23,015)  
Customers [Member] | Commercial [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 58,294 68,723 70,925 69,717
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 35,628 29,092 27,866  
Reversal, allowance account for credit losses of financial assets (46,057) (31,294) (26,658)  
Customers [Member] | Rural [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 2,960 3,937 3,389 3,810
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 6,407 4,788 1,499  
Reversal, allowance account for credit losses of financial assets (7,384) (4,240) (1,920)  
Customers [Member] | Public Entities [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 381 3,084 4,890 4,874
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 184 9 435  
Reversal, allowance account for credit losses of financial assets (2,887) (1,815) (419)  
Customers [Member] | Public Lighting [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 11 8 3 120
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 11 20 (117)  
Reversal, allowance account for credit losses of financial assets (8) (15)    
Customers [Member] | Public Service [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets (27) 143 265 199
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets (16) 124 145  
Reversal, allowance account for credit losses of financial assets (154) (246) (79)  
Customers [Member] | Unbilled [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 2,474 1,589 1,180 1,502
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 885 409 (322)  
Customers [Member] | Adjustment To Present Value [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets (1,504) (650) (1,441) (2,883)
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets (854) 791 1,442  
Concessionaires And Permission Holder [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 139,428 140,198 140,090 129,139
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 1,224 392 11,608  
Reversal, allowance account for credit losses of financial assets (1,994) (284) (657)  
Concessionaires And Permission Holder [Member] | C C E E [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 119,665 119,665 119,665 119,665
Concessionaires And Permission Holder [Member] | Concessionaires And Permission Holder [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 19,763 20,533 20,425 9,474
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 1,224 392 11,608  
Reversal, allowance account for credit losses of financial assets (1,994) (284) (657)  
Telecommunications [Member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 12,257   5,149 3,879
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 3,042 3,609 13,292  
Reversal, allowance account for credit losses of financial assets (3,153) (6,260) (12,022)  
[custom:ReclassificationAllowanceAccountForCreditLossesOfFinancialAssets] [1] 111 (2,498)    
Gas distribution [member]        
IfrsStatementLineItems [Line Items]        
Allowance account for credit losses of financial assets 9,885   12,528 R$ 12,112
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets (2,611) 238 1,063  
Reversal, allowance account for credit losses of financial assets R$ 239 R$ (509) R$ (647)  
[1] Reclassification to Assets classified as held for sale (Note 41).