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Financial Instruments and Risk Management - Schedule of Changes in Value of Options (Details) - Put option - SAAG [member] - BRL (R$) R$ in Millions | 3 Months Ended | 12 Months Ended
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Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Balance |  |  | R$ 672 | R$ 636 | R$ 536
Adjustment to fair value |  | R$ 25 | 58 | 36 | 100
Related assets | [1] |  | 50 |  |
Payment |  |  | (780) |  |
Balance |  |  | R$ 0 | R$ 672 | R$ 636
[1] | With the acquisition of the share units then held by the Funds in the Investment Structure, Cemig GT became the holder of the related assets, which have aggregate value of R$50. This amount is recognized in Other assets in the Statement of financial position.

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- Definition Adjustment to fair value of options. + References No definition available. + Details
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- Definition Payment Value of Options + References No definition available. + Details
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- Definition Related Assets + References No definition available. + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + 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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- Details
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