XML 143 R125.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Investments - Schedule of Sale of Capital Gain Recognized (Details) - Cemiggt [Member] R$ in Millions | Mar. 20, 2023 BRL (R$)
--- | ---
IfrsStatementLineItems [Line Items] |  |
Selling price | R$ 736 |
Number of value sold | R$ 55 | [1]
Direct Participation [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interest rate | 4.1422% |
Number of value sold | R$ 30 |
Indirect Participation [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interest rate | 3.3837% |
Number of value sold | R$ 25 | [1]
[1] | The effects of the sale are presented in the results of the Holdings/Holding operating segment in note 5.

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 Number Of Value Sold + References No definition available. + Details
Name: | cig_NumberOfValueSold
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Selling price amount. + References No definition available. + Details
Name: | cig_SellingPriceAmount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The effective interest rate of financial assets reclassified out of the available-for-sale measurement category. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 12A -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_12A_f&doctype=Standard&book=b -URIDate 2023-03-23 + Details
Name: | ifrs-full_EffectiveInterestRateOfFinancialAssetsReclassifiedOutOfAvailableforsaleFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=cig_CemiggtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ConsolidatedStructuredEntitiesAxis=cig_DirectParticipationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ConsolidatedStructuredEntitiesAxis=cig_IndirectParticipationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |