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v3.24.1.u1

Reimbursement of Tariff Subsidies - Additional Information (Details) - BRL (R$) R$ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Subsidies revenue recognized | R$ 1,565 | R$ 1,689
Other subsidies | 78 | 284
Current subsidy receivable | 196 | R$ 159
Cemig D [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Current subsidy receivable | 187 |
Ceming G T [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Current subsidy receivable | R$ 9 |

X
- Definition Current Subsidy Receivable + References No definition available. + Details
Name: | cig_CurrentSubsidyReceivable
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

X
- Definition Other subsidies. + References No definition available. + Details
Name: | cig_OtherSubsidies
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Subsidies Revenue Recognized + References No definition available. + Details
Name: | cig_SubsidiesRevenueRecognized
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cig_CemigDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cig_CemingGTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |