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: