XML 150 R132.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Property, Plant and Equipment - Schedule of Consortium (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |
Total | R$ 80 | R$ 87
Total | 78 | 85
Total | 2 | 2
Usina de Queimado [meber] |  |
IfrsStatementLineItems [Line Items] |  |
Total | R$ 220 | 220
Usina de Queimado [meber] | Investment property completed [member] |  |
IfrsStatementLineItems [Line Items] |  |
Stake in power output (%) | 82.50% |
Average annual depreciation rate (%) | 3.94% |
Usina de Queimado [meber] | Investment Property Completed 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Stake in power output (%) | 82.50% |
Accumulated depreciation [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total | R$ (142) | (135)
Usina De Queimado 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total | R$ 2 | R$ 2

X
- Definition Represent information about the average annual depreciation rate. + References No definition available. + Details
Name: | cig_AverageAnnualDepreciationRate
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ifrs Statement Line Items + References No definition available. + Details
Name: | cig_IfrsStatementLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information about the stake in power output. + References No definition available. + Details
Name: | cig_StakeInPowerOutput
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of total. + References No definition available. + Details
Name: | cig_Total
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total 1 + References No definition available. + Details
Name: | cig_Total1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total 2 + References No definition available. + Details
Name: | cig_Total2
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=ifrs-full_InvestmentPropertyCompletedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_InvestmentPropertyCompleted1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_UsinaDeQueimado1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |