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27. REVENUE (Details Narrative) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue [abstract]
Average of the implicit rates	6.86%
Non-recurring tax provision due	R$ 135
Tariff flag revenue	47
Revenue recognized for the tariff subsidies	R$ 1,035	R$ 1,079

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- Definition

Represent information about the average of implicit rates.

+ References

No definition available.

+ Details

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Namespace Prefix:	cig_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of nonrecurring tax provision due.

+ References

No definition available.

+ Details

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

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- Definition

The amount of revenue recognized for tariff subsidies.

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No definition available.

+ Details

Name:	cig_RevenueRecognizedForTariffSubsidies
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of tariff flag revenue.

+ References

No definition available.

+ Details

Name:	cig_TariffFlagRevenue
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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