XML 245 R224.htm IDEA: XBRL DOCUMENT
v3.25.1

Financial Instruments and Risk Management - Schedule of measures arising from non-compliance of quality criteria and parameters for economic and financial sustainability (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021
In the base year [member] | Economic and financial management [member] |  |
Disclosure of detailed information about service concession arrangements [line items] |  |
Measures arising from non-compliance | Capital contribution (1)Limitation on the distribution of dividends and interest on own capitalRestrictive regime for contracts with related parties | [1]
In the base year [member] | Quality of supply [member] |  |
Disclosure of detailed information about service concession arrangements [line items] |  |
Measures arising from non-compliance | Results plan | [2]
2 consecutive years [member] | Economic and financial management [member] |  |
Disclosure of detailed information about service concession arrangements [line items] |  |
Measures arising from non-compliance | Expiry of the concession |
2 consecutive years or 3 of the previous 5 calendar years [member] | Quality of supply [member] |  |
Disclosure of detailed information about service concession arrangements [line items] |  |
Measures arising from non-compliance | Limitation on the distribution of dividends and interest on own capital | [3]
3 consecutive years [Member] | Quality of supply [member] |  |
Disclosure of detailed information about service concession arrangements [line items] |  |
Measures arising from non-compliance | Expiry of the concession |
[1] | Within 180 days of the end of each financial year, for the total insufficiency that occurs in reaching the Minimum Parameter for Economic and Financial Sustainability.
[2] | Failure to comply with any of the DEC or FEC limits for one year makes it compulsory for the concessionaire to present a Results Plan, which must be submitted for Aneel's prior acceptance and monitored in its execution by the inspection areas.
[3] | This limitation will come into effect on January 1st of the calendar year following the year in which the indicator was not met.

X
- Definition Explaination of distribution service concession measures arising from non-compliance. + References No definition available. + Details
Name: | cig_DistributionServiceConcessionMeasuresArisingFromNonCompliance
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfServiceConcessionArrangementsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ServiceConcessionArrangementsAxis=cig_CriteriaOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_IndicatorAxis=cig_EconomicAndFinancialManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_IndicatorAxis=cig_QualityOfSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ServiceConcessionArrangementsAxis=cig_CriteriaTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ServiceConcessionArrangementsAxis=cig_CriteriaThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ServiceConcessionArrangementsAxis=cig_CriteriaFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |