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Concessions and Authorizations - Schedule of Concession and Amount to be Paid (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($)
Irape Enterprise [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Nominal value in 2023 | $ 45 |
Present value in 2023 | $ 22 |
Period of the concession | 03/2006 - 09/2037 | [1]
Updating indexer | IGPM |
Queimado [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Nominal value in 2023 | $ 12 |
Present value in 2023 | $ 6 |
Period of the concession | 01/2004 - 06/2034 | [1]
Updating indexer | IGPM |
[1] | The term presented includes the extension of the concession grant for these plants under the terms of ReH 2,932, of September 14, 2021. During the period of the extension of the concession term, the generator will freely dispose of the energy from the undertaking, under the terms of Law 13,203/2015, with the other clauses unchanged for both contracts.

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- Definition Amortization Period + References No definition available. + Details
Name: | cig_AmortizationPeriod
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Concession Nominal Value + References No definition available. + Details
Name: | cig_ConcessionNominalValue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Concession Present Value + References No definition available. + Details
Name: | cig_ConcessionPresentValue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Definition Inflation Index To Be Used To Adjust Historical Amounts + References No definition available. + Details
Name: | cig_InflationIndexToBeUsedToAdjustHistoricalAmounts
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_IrapeEnterpriseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_QueimadoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |