XML 190 R172.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Post-Employment Obligations - Schedule of Assumptions (Details) R$ in Millions | Dec. 31, 2023 BRL (R$)
--- | ---
IfrsStatementLineItems [Line Items] |
Reduction of one year in the mortality table | R$ 403
Increase of one year in the mortality table | (374)
Reduction of 1% in the discount rate | 1,488
Pension And Retirement Supplement Plans [member] |
IfrsStatementLineItems [Line Items] |
Reduction of one year in the mortality table | 341
Increase of one year in the mortality table | (311)
Reduction of 1% in the discount rate | 1,140
Health plan [member] |
IfrsStatementLineItems [Line Items] |
Reduction of one year in the mortality table | 61
Increase of one year in the mortality table | (62)
Reduction of 1% in the discount rate | 342
Dental plan [member] |
IfrsStatementLineItems [Line Items] |
Reduction of one year in the mortality table | 1
Increase of one year in the mortality table | (1)
Reduction of 1% in the discount rate | R$ 6

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 Reduction of one percent in discount rate. + References No definition available. + Details
Name: | cig_ReductionOfOnePercentInDiscountRate
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cig_PensionAndRetirementSupplementPlansMember
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: |