XML 117 R81.htm IDEA: XBRL DOCUMENT v3.22.1

Schedule of nominal value and present value portion to be paid (Details) R$ in Millions	12 Months Ended
	Dec. 31, 2021 BRL (R$)
Irape Enterprise [Member]
IfrsStatementLineItems [Line Items]
Percentage interest	100.00%
Amounts paid in 2019	R$ 3
Nominal value of amounts to be paid in the next 12 months	R$ 3
Queimadao Consortium Enterprise [Member]
IfrsStatementLineItems [Line Items]
Percentage interest	82.50%
Amounts paid in 2019	R$ 1
Nominal value of amounts to be paid in the next 12 months	R$ 1

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	cig_NominalValueOfAmountsToBePaidInNextTwelveMonths
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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

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- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_IrapeEnterpriseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_QueimadaoConsortiumEnterpriseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: