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

X
- 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

X
- References No definition available. + Details
Name: | cig_PercentageOfConcessionInterest
Namespace Prefix: | cig_
Data Type: | num:percentItemType
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: |