XML 154 R133.htm IDEA: XBRL DOCUMENT
v3.25.1

Intangible Assets - Schedule of Power Plant Offer for Tender (Details) R$ in Millions | 12 Months Ended
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Dec. 31, 2024 BRL (R$)
IfrsStatementLineItems [Line Items] |
Offer Tender | R$ 1,323
Sao Simao [Member] |
IfrsStatementLineItems [Line Items] |
Offer Tender | 783
Miranda [Member] |
IfrsStatementLineItems [Line Items] |
Offer Tender | 146
Jaguara [Member] |
IfrsStatementLineItems [Line Items] |
Offer Tender | 237
Volta Grande [Member] |
IfrsStatementLineItems [Line Items] |
Offer Tender | R$ 157

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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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- Definition Offer Tender + References No definition available. + Details
Name: | cig_OfferTender
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=cig_SaoSimaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=cig_MirandaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=cig_JaguaraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=cig_VoltaGrandeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |