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v3.24.1.u1

Loans and Debentures - Schedule of Guarantees of the Debtor Balance on Loans and Financings (Details) $ in Millions | Dec. 31, 2023 USD ($)
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IfrsStatementLineItems [Line Items] |
Borrowings | $ 9,831
Promissory Notes and Sureties [member] |
IfrsStatementLineItems [Line Items] |
Borrowings | 2,489
Guarantee and Receivables [member] |
IfrsStatementLineItems [Line Items] |
Borrowings | 2,208
Sureties [Member] |
IfrsStatementLineItems [Line Items] |
Borrowings | 4,059
Unsecured [member] |
IfrsStatementLineItems [Line Items] |
Borrowings | $ 1,075

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- Definition Borrowing + References No definition available. + Details
Name: | cig_Borrowing
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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- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_PromissoryNotesAndSuretiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_GuaranteeAndReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_SuretiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_UnsecuredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |