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Related Party Transactions (Details 2) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related party transactions [abstract] |  |  |
Opening balances | R$ 146 | R$ 335 | R$ 188
Dividends proposed by investees | 496 | 519 | 655
Withholding income tax on Interest on equity |  |  | (9)
Amounts received | (592) | (708) | (499)
Ending balances | R$ 50 | R$ 146 | R$ 335

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- Definition Dividend receivable. + References No definition available. + Details
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Namespace Prefix: | cig_
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Balance Type: | debit
Period Type: | instant

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- Definition Investees dividends proposal. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of withholding income tax on Interest on equity. + References No definition available. + Details
Name: | cig_WithholdingIncomeTaxOnInterestOnEquity
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B12 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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