XML 116 R80.htm IDEA: XBRL DOCUMENT v3.22.1

Schedule of concession and amount to be paid (Details) R$ in Millions	12 Months Ended
	Dec. 31, 2021 BRL (R$)
Irape Enterprise [Member]
IfrsStatementLineItems [Line Items]
Nominal value in 2019	R$ 42
Present value in 2019	R$ 21
Period of the concession	03/2006 – 02/2035
Updating indexer	IGPM
Queimadao Consortium Enterprise [Member]
IfrsStatementLineItems [Line Items]
Nominal value in 2019	R$ 12
Present value in 2019	R$ 6
Period of the concession	01/2004 – 12/2032
Updating indexer	IGPM

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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