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v3.22.1

Credit losses, provisions and reversals (Details) - Restated One [Member] - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | R$ 240,787 | R$ 237,294 | R$ 260,051
Provision Reversal For Litigations [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | 190,071 | 150,269 | 243,848
Power Generation Concession Contract [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | (2,604) | (10,502) | (2,945)
Q N P R Gas Impairment [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | 15,688 |  |
Property Plant And Equipment Expense [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | (147,938) | (37,609) | (117,744)
Allowance For Doubtful Accounts Client And Other Credits [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | 181,023 | 128,466 | 140,348
Tax Credits Estimated Losses [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals | 4,547 | (1,298) | (3,456)
Provision For Losses On Equity Interests [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Credit losses, provisions and reversals |  | R$ 7,968 |

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