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21. TAXES PAYABLE AND AMOUNTS TO BE REFUNDED TO CUSTOMERS (Details Narrative) R$ in Millions	12 Months Ended
	Dec. 31, 2020 BRL (R$)
Disclosure of taxes, income tax and social contribution tax [abstract]
Amounts unduly paid	10 years
Negative financial component	R$ 714

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- Definition

Amounts unduly paid.

+ References

No definition available.

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- Definition

Disclosure of taxes, income tax and social contribution tax [abstract].

+ References

No definition available.

+ Details

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- Definition

Negative financial component.

+ References

No definition available.

+ Details

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