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Investments - Schedule of Measurements of Fair Value of Assets and Liabilities (Details) - BRL (R$) R$ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 28, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 20, 2023
IfrsStatementLineItems [Line Items] |  |  |  |
Bargain purchase |  | R$ 5 | R$ 4 |
Goodwill |  |  |  | R$ 6
C E M I G Sim [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Net equity of the Montes Claros solar plant | R$ 20 |  |  |
Added value (fair value - book value) | 1 |  |  |
Fair value of net assets acquired | 21 |  |  |
Goodwill | 1 |  |  |
Consideration paid | R$ 20 |  |  |

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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 134 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_134_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_135_a&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2023-01-01 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_c&doctype=Standard -URIDate 2023-03-23 + Details
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