XML 92 R78.htm IDEA: XBRL DOCUMENT
v3.23.2

CONCESSIONS AND AUTHORIZATIONS (Details 2) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 BRL (R$)
Irape Enterprise [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Interest | 100.00% | [1]
[custom:ConcessionAmountPaid-0] | R$ 3 | [1]
[custom:NominalValueOfAmountsToBePaidInNextTwelveMonths-0] | 3 | [1]
[custom:PresentValueOfAmountsToBePaidInNextTwelveMonths-0] | R$ 3 | [1]
Queimado [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Interest | 82.50% | [2]
[custom:ConcessionAmountPaid-0] | R$ 1 | [2]
[custom:NominalValueOfAmountsToBePaidInNextTwelveMonths-0] | 1 | [2]
[custom:PresentValueOfAmountsToBePaidInNextTwelveMonths-0] | R$ 1 | [2]
[1] | Certificados de Depósito Bancário
[2] | Overnight

X
- References No definition available. + Details
Name: | cig_ConcessionAmountPaid
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_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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | cig_PresentValueOfAmountsToBePaidInNextTwelveMonths
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_QueimadoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |