XML 209 R188.htm IDEA: XBRL DOCUMENT
v3.25.1

Revenue - Schedule of Other Operating Revenues (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |  |
Total | R$ 2,906 |  | R$ 2,316 | R$ 2,658
Products [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charged service | 18 |  | 21 | 19
Services rendered | 98 |  | 85 | 66
Low-income subsidy | 463 |  | 401 | 321
Subsidy SCEE | (14) | [1] | 129 |
Subsidy Eletrobras | 104 |  | 51 | 432
Tariff flags subsidy | 153 |  | 78 | 290
CDE subsidy to cover tariff discounts | 1,334 |  | 984 | 931
Subsidies associated with the EUST | 71 |  | 47 | 31
Rental and leasing | 562 |  | 412 | 493
Contractual indemnities | 0 |  | 6 |
Others | R$ 117 |  | R$ 102 | R$ 75
[1] | The variation arises from Cemig D's Annual Tariff Readjustment.

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- Definition Represents the amount of CDE subsidy to cover tariff discounts. + References No definition available. + Details
Name: | cig_CDESubsidyCoverTariffDiscounts
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Charged Service + References No definition available. + Details
Name: | cig_ChargedService
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contractual Indemnities + References No definition available. + Details
Name: | cig_ContractualIndemnities
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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 Lowincome Subsidy + References No definition available. + Details
Name: | cig_LowincomeSubsidy
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Operating + References No definition available. + Details
Name: | cig_OtherOperating
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rental And Leasing + References No definition available. + Details
Name: | cig_RentalAndLeasing
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Services Rendered + References No definition available. + Details
Name: | cig_ServicesRendered
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of subsidies associated with the EUST. + References No definition available. + Details
Name: | cig_SubsidiesAssociatedWithEUST
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Subsidy Eletrobras. + References No definition available. + Details
Name: | cig_SubsidyEletrobras
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Subsidy SCEE. + References No definition available. + Details
Name: | cig_SubsidyScee
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tariff flags subsidy. + References No definition available. + Details
Name: | cig_TariffFlagsSubsidy
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of revenue arising from sources that the entity does not separately disclose in the same statement or note. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_OtherRevenue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |