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v3.24.1.u1

Concessions and Authorizations - Schedule of Nominal Value and Present Value Portion to be Paid (Details) R$ in Millions | 12 Months Ended
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Dec. 31, 2023 BRL (R$)
Irape Enterprise [Member] |
IfrsStatementLineItems [Line Items] |
Interest | 100.00%
[custom:ConcessionAmountPaid-0] | R$ 3
[custom:NominalValueOfAmountsToBePaidInNextTwelveMonths-0] | 3
[custom:PresentValueOfAmountsToBePaidInNextTwelveMonths-0] | R$ 3
Queimado [Member] |
IfrsStatementLineItems [Line Items] |
Interest | 82.50%
[custom:ConcessionAmountPaid-0] | R$ 1
[custom:NominalValueOfAmountsToBePaidInNextTwelveMonths-0] | 1
[custom:PresentValueOfAmountsToBePaidInNextTwelveMonths-0] | R$ 1

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

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

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- Definition Nominal Value Of Amounts To Be Paid In Next Twelve Months + References No definition available. + Details
Name: | cig_NominalValueOfAmountsToBePaidInNextTwelveMonths
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage Of Concession Interest + References No definition available. + Details
Name: | cig_PercentageOfConcessionInterest
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Present Value Of Amounts To Be Paid In Next Twelve Months + References No definition available. + Details
Name: | cig_PresentValueOfAmountsToBePaidInNextTwelveMonths
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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