XML 189 R153.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of average periods of the obligations under the benefit plans (Details) | 12 Months Ended
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Dec. 31, 2021
Pension And Retirement Supplement Plans Plan A [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 10 years 15 days
Pension And Retirement Supplement Plans Plan B [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 12 years 10 months 10 days
Health Plan [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 14 years 5 months 9 days
Dental Plan [member] |
IfrsStatementLineItems [Line Items] |
Average periods of maturity of the obligations under the benefit plans | 15 years 5 months 20 days

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- References No definition available. + Details
Name: | cig_IfrsStatementLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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

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

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