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.

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value of financial assets that have been reclassified out of the available-for-sale category. [Refer: At fair value [member]; Financial assets, at fair value]

+ 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 b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_12A_b&doctype=Standard&book=b
-URIDate 2023-03-23

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of financial assets that have been reclassified out of the available-for-sale category. [Refer: Financial assets]

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

Name:	ifrs-full_TypesOfInvestmentPropertyAxis=cig_RetiroBaixoMember
Namespace Prefix:
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Period Type:

Investments - Schedule of Assets Held for Sale at Book Value (Details) - BRL (R$) R$ in Millions	Nov. 30, 2023	Sep. 30, 2023	Apr. 30, 2023
Disclosure of detailed information about investment property [line items]
Book value			R$ 350
Fair value net of selling expenses			592
Baguari Energia [Member]
Disclosure of detailed information about investment property [line items]
Book value		R$ 160	160
Fair value net of selling expenses			392
Retiro Baixo [Member]
Disclosure of detailed information about investment property [line items]
Book value	R$ 191		190
Fair value net of selling expenses			R$ 200