XML 148 R127.htm IDEA: XBRL DOCUMENT
v3.25.1

Property, Plant and Equipment - Schedule of Summary of Property Plant and Equipment Depreciation Rate (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024
Reservoirs, dams and watercourses [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 2.00%
Computer software [member] | Administration unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 20.00%
Buildings - machine room [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 2.00%
Vehicle [Member] | Administration unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 14.29%
Buildings - other [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 3.33%
Buildings - other [member] | Administration unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 3.33%
IT equipment in general [member] | Administration unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 16.67%
Generator [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 3.33%
General Equipment [Member] | Administration unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 6.25%
Water turbine [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 2.50%
Pressure tunnel [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 3.13%
Command station, panel and cubicle [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 3.57%
Floodgate [member] | Generation unit [member] |
IfrsStatementLineItems [Line Items] |
Property plant and equipment depreciation rate | 3.33%

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 Property plant and equipment depreciation rate. + References No definition available. + Details
Name: | cig_PropertyPlantAndEquipmentDepreciationRate
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_ReservoirsDamsAndWaterCoursesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_BuildingsMachineRoomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_VehicleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_BuildingsOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_ITEquipmentInGeneralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_GeneratorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_GeneralEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_WaterTurbineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_PressureTunnelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_CommandStationPanelAndCubicleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_FloodgateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |