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Investments - Schedule of Goodwill, Capital Gain and Gain on Fair Value Adjustment of Previous Investment (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about investment property [line items] |  |  |  |
Consideration paid | R$ (343) |  | R$ (331) | R$ (309)
Gain from adjustment to fair value of previous investment (a - b) |  | [1] | R$ 9 |
[1] | This refers to the gain on adjustment to fair value of the previous shareholding interest recognized in the process of acquisition by Cemig SIM, in the 2023 fiscal year, of the remaining 51% of UFV Campo Lindo 1, UFV Campo Lindo 2 and UFV Olaria 1.

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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 40 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_40_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gains (losses) from changes in the fair value of investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 76 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_76_d&doctype=Standard -URIDate 2024-03-27 + Details
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