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Receivables from Customers, Traders and Concession Holders - Additional Information (Details) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Receivables from Customers, Traders and Concession Holders
Reversal of amounts to be refunded to consumers	R$ (411)
Billing period for estimated expected loss average history of non-collection over the total amount billed in each month	36 months
Billing period for estimated expected loss average history of non-collection over the total amount billed in each month for regular consumer	36 months
Billing period for estimated expected loss average history of non-collection over the total amount billed in each month for irregular consumption	18 months
Expected losses fully recognized for accounts overdue duration	36 months

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- Definition

Adjustments for decrease (increase) in reversal of amounts to be refunded to consumers to reconcile profit (loss) to net cash flow from (used in) operating activities.

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No definition available.

+ Details

Name:	cig_AdjustmentsForReversalOfAmountOfConsumersRefund
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Estimated expected loss average history of non-collection over the total amount billed in each month, billing period.

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No definition available.

+ Details

Name:	cig_BillingPeriodForEstimatedExpectedLossAverageHistoryOfNonCollectionOverTotalAmountBilledInEachMonth
Namespace Prefix:	cig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Estimated expected loss average history of non-collection over the total amount billed in each month, billing period for irregular consumption.

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No definition available.

+ Details

Name:	cig_BillingPeriodForEstimatedExpectedLossAverageHistoryOfNonCollectionOverTotalAmountBilledInEachMonthForIrregularConsumer
Namespace Prefix:	cig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Estimated expected loss average history of non-collection over the total amount billed in each month, billing period for regular consumer.

+ References

No definition available.

+ Details

Name:	cig_BillingPeriodForEstimatedExpectedLossAverageHistoryOfNonCollectionOverTotalAmountBilledInEachMonthForRegularConsumer
Namespace Prefix:	cig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Duration for expected losses fully recognized for accounts overdue.

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No definition available.

+ Details

Name:	cig_ExpectedLossesFullyRecognizedForAccountsOverdueDuration
Namespace Prefix:	cig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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