XML 166 R145.htm IDEA: XBRL DOCUMENT v3.25.1

Loans and Debentures - Schedule of Guarantees of the Debtor Balance on Loans and Financings (Details) R$ in Millions	Dec. 31, 2024 BRL (R$)
IfrsStatementLineItems [Line Items]
Borrowings	R$ 12,280
Promissory Notes and Sureties [member]
IfrsStatementLineItems [Line Items]
Borrowings	334
Guarantee and Receivables [member]
IfrsStatementLineItems [Line Items]
Borrowings	2,042
Sureties [Member]
IfrsStatementLineItems [Line Items]
Borrowings	8,694
Unsecured [member]
IfrsStatementLineItems [Line Items]
Borrowings	R$ 1,210

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- Definition

Borrowing

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

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- Definition

Ifrs Statement Line Items

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No definition available.

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Namespace Prefix:	cig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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X

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_GuaranteeAndReceivablesMember
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Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=cig_SuretiesMember
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X

- Details

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