XML 251 R230.htm IDEA: XBRL DOCUMENT
v3.25.1

Sale Of Assets - Schedule of Conclusion Of The Transaction Cost Recognized The Following Accounting Effects (Details) - BRL (R$) R$ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2024 | Dec. 31, 2024
IfrsStatementLineItems [Line Items] |  |  |
Total sale price |  | R$ 2,737 |
(-) Balance of assets held for sale on 02/29/2024, before sale |  | (1,119) |
Capital gain |  | 1,617 |
IRPJ and CSLL(1) |  | (615) |
Net impact on the Income Statement | [1] | R$ 1,082 |
Cemiggt [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Total sale price |  |  | R$ 101
(-) Balance of assets held for sale on 02/29/2024, before sale |  |  | (58)
Capital gain |  |  | 43
IRPJ and CSLL(1) | [2] |  | (18)
Net impact on the Income Statement |  |  | R$ 25
[1] | The effects of the sale are part of the Holdings operational segment.
[2] | Taxes were calculated on the taxable capital gain, which does not take into account the assigned cost balance.

X
- Definition The Corporate capital gain. + References No definition available. + Details
Name: | cig_CorporateCapitalGain
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The corporate income tax and the social contribution on net income. + References No definition available. + Details
Name: | cig_CorporateIncomeTaxAndTheSocialContributionOnNetIncome
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Ifrs Statement Line Items + References No definition available. + Details
Name: | cig_IfrsStatementLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net impact on the income statement of corporate capital gain and tax capital gain net of taxes. + References No definition available. + Details
Name: | cig_NetImpactOnTheIncomeStatementOfCorporateCapitalGainAndTaxCapitalGainNetOfTaxes
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total transaction sale price. + References No definition available. + Details
Name: | cig_TotalTransactionSalePrice
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of non-current assets or disposal groups classified as held for sale. [Refer: Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2024-01-01 -Paragraph 38 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2024-en-r&anchor=para_38&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemiggtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |