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The potential right to recovery of PIS/Pasep and Cofins taxes embedded in the leasing consideration, according to the periods specified for payment, is as follows: (Details) R$ in Millions	12 Months Ended
	Dec. 31, 2021 BRL (R$)
[custom:ConsiderationForLleasingNominal]	R$ 663
[custom:ConsiderationForLleasingAdjusted]	244
[custom:PotentialAndConflisLeasingNominal]	56
[custom:PotentialAndConflisLeasingAdjusted]	R$ 18

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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