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v3.23.1

REIMBURSEMENT OF TARIFF SUBSIDIES (Details Narrative) - BRL (R$) R$ in Millions | Mar. 10, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Subsidies revenue recognized |  | R$ 936 | R$ 986
Current subsidy receivable | R$ 98 | 97 | 86
Cemig D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current subsidy receivable |  | 91 | 82
Ceming G T [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current subsidy receivable |  | 6 | R$ 4
Banco A B C [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current subsidy receivable |  | 100 |
Brasil S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current subsidy receivable |  | 25 |
C D E [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Current subsidy receivable |  | R$ 75 |

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

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- 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: |

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

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

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