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Recoverable Taxes - Schedule of Recoverable Taxes (Details) - BRL (R$) R$ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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IfrsStatementLineItems [Line Items] |  |
Recoverable taxes, current | R$ 635 | R$ 1,917
Recoverable taxes, non-current | 1,319 | 1,358
Recoverable taxes | 1,954 | 3,275
ICMS (VAT) [member] |  |
IfrsStatementLineItems [Line Items] |  |
Recoverable taxes, current | 476 | 449
Recoverable taxes, non-current | 726 | 548
PIS/PasepTaxes [member] |  |
IfrsStatementLineItems [Line Items] |  |
Recoverable taxes, current | 24 | 258
Recoverable taxes, non-current | 128 | 166
Cofins [member] |  |
IfrsStatementLineItems [Line Items] |  |
Recoverable taxes, current | 114 | 1,189
Recoverable taxes, non-current | 465 | 644
Other Tax Recoverable [member] |  |
IfrsStatementLineItems [Line Items] |  |
Recoverable taxes, current | R$ 21 | R$ 21

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- Definition Current Recoverable Taxes + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Ifrs Statement Line Items + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-current recoverable taxes. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recoverable taxes + References No definition available. + Details
Name: | cig_RecoverableTaxes
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_ClassesOfAcquiredReceivablesAxis=cig_ICMSVATMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAcquiredReceivablesAxis=cig_PISAndPaseptaxesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAcquiredReceivablesAxis=cig_CofinsTaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAcquiredReceivablesAxis=cig_OtherTaxRecoverableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |