XML 189 R168.htm IDEA: XBRL DOCUMENT
v3.25.1

Post-Employment Obligations - Schedule of Measured at Fair Value (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Assets of the pension plan | R$ 282 | R$ 375
Non convertible debentures issued by the company [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets of the pension plan | 53 | 96
Shares issued by the company [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets of the pension plan | 226 | 4
Real estate properties of the foundation occupied by the company [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets of the pension plan | R$ 3 | R$ 275

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 The amount securities that are backed by underlying assets contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_g&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AssetbackedSecuritiesAmountContributedToFairValueOfPlanAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=cig_NonConvertibleDebenturesIssuedByCompanyAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=cig_SharesissuedByTheCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=cig_RealEstatePropertiesByCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |