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v3.25.1

Subsequent Events -Schedule of average adjustments of consumer rates (Details) - Gas Distribution Tariff Adjustment Member | Jan. 24, 2025
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Industrial [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of average adjustments of consumer rates | 0.18%
Co-generation [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of average adjustments of consumer rates | 0.44%
Automotive [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of average adjustments of consumer rates | 0.33%
Compressed Natural Gas / Liquefied Natural Gas [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of average adjustments of consumer rates | 1.32%

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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 Represents the percentage of average adjustments of consumer rates. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_GasDistributionTariffAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_IndustrialSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_GenerationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_AutomotiveSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_GasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |