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: