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Schedule of provision for allowance for doubtful accounts (Details) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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