XML 210 R189.htm IDEA: XBRL DOCUMENT
v3.25.1

Revenue - Schedule of Deduction on Revenue (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |
Taxes on revenues | R$ 9,636 | R$ 8,740 | R$ 8,488
Charges to the consumer | 4,305 | 4,344 | 4,198
Deductions from revenue | 13,941 | 13,084 | 12,686
ICMS - State VAT [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Taxes on revenues | 5,743 | 5,043 | 4,892
Cofins [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Taxes on revenues | 3,193 | 3,032 | 2,948
Pis and pasep tax [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Taxes on revenues | 693 | 658 | 643
Other Taxes [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Taxes on revenues | 7 | 7 | 5
Global Reversion Reserve (RGR) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 8 | 12 | 14
Energy Efficiency Program (PEE) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 83 | 74 | 69
Energy Development Account (CDE) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 3,873 | 3,949 | 4,057
Research and Development [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 41 | 37 | 35
National Scientific and Technological Development Fund (FNDCT) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 59 | 53 | 49
Energy System Expansion Research (EPE of MME) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 30 | 27 | 25
Customer charges - Proinfa alternative sources program [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 58 | 63 | 77
Energy services inspection fee [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 41 | 37 | 33
Royalties for use of water resources [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 68 | 53 | 54
Customer charges - the 'Flag Tariff' system [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer |  |  | (252)
Cde On R And D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | 18 | 16 | 15
CDE On PEE Member |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Charges to the consumer | R$ 26 | R$ 23 | R$ 22

X
- Definition Charges to consumer. + References No definition available. + Details
Name: | cig_ChargesToConsumer
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deductions From Revenue + References No definition available. + Details
Name: | cig_DeductionsFromRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 Taxes on revenues. + References No definition available. + Details
Name: | cig_TaxesOnRevenues
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_ICMSTaxesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_PisAndPasepTaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_OtherTaxesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_GlobalReversionReserveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_EnergyEfficiencyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_EnergyDevelopmentAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_ResearchAndDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_NationalScientificAndTechnologicalDevelopmentFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_EnergySystemExpansionResearchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_ProinfaAlternativeSourceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_EnergyServicesInspectionFeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_RoyaltyOnWaterResourceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_CustomerChargesTheFlagTariffSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_CdeOnRAndDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_CDEOnPEEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |