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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).

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