XML 187 R166.htm IDEA: XBRL DOCUMENT
v3.25.1

Post-Employment Obligations - Schedule of Average Periods of Obligations Under Benefit Plans (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024
Pension plans and retirement supplement plans - Plan A [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 8 years 8 months 4 days
Pension plans and retirement supplement plans - Plan B [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 10 years 8 months 15 days
Health plan [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 10 years 7 months 6 days
Dental plan [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 10 years 7 months 6 days

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 Total maturity period of defined benefit plans. + References No definition available. + Details
Name: | cig_MaturityPeriodOfDefinedBenefitPlans
Namespace Prefix: | cig_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cig_PensionAndRetirementSupplementPlansPlanAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cig_PensionAndRetirementSupplementPlansPlanBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cig_HealthPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cig_DentalPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |