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Concession Contract Assets - Additional Information (Details) - BRL (R$) R$ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 05, 2023 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |
Borrowing costs capitalised |  | R$ 70 |
Borrowing costs capitalised |  | 11.75% | 11.36%
Permitted annual revenue |  | R$ 17 |
Amortization rate |  | 3.00% |
Amortization rate |  | 16.11% |
Contract 0792020 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Repositioning factor |  | 50.00% |
Concession contract - 006/97 |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Percentage of increase in the permitted annual revenue | 1.16% |  |
Permitted annual revenue | R$ 1,084,670 |  |
Increase in permitted annual revenue | R$ 1,097,264 |  |
Percentage of reduction in the adjustment portion | 35.50% |  |
Adjustment portion | R$ 39,303 |  |
Reduction in adjustment portion | R$ 25,350 |  |

X
- Definition Adjustment portion. + References No definition available. + Details
Name: | cig_AdjustmentPortion
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization Rate + References No definition available. + Details
Name: | cig_AmortizationRate
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortization Rate 1 + References No definition available. + Details
Name: | cig_AmortizationRate1
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Borrowing Cost Capitalised + References No definition available. + Details
Name: | cig_BorrowingCostCapitalised
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Borrowing Costs Capitalised Rate + References No definition available. + Details
Name: | cig_BorrowingCostsCapitalisedRate
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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 Increase in permitted annual revenue. + References No definition available. + Details
Name: | cig_IncreaseInPermittedAnnualRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of increase in the permitted annual revenue. + References No definition available. + Details
Name: | cig_PercentageOfIncreaseInThePermittedAnnualRevenue
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of reduction in the adjustment portion. + References No definition available. + Details
Name: | cig_PercentageOfReductionInTheAdjustmentPortion
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Permitted annual revenue. + References No definition available. + Details
Name: | cig_PermittedAnnualRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reduction in adjustment portion. + References No definition available. + Details
Name: | cig_ReductionInAdjustmentPortion
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Repositioning Factor + References No definition available. + Details
Name: | cig_RepositioningFactor
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersAxis=cig_Contract0792020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersAxis=cig_ConcessionContractFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |