XML 101 R80.htm IDEA: XBRL DOCUMENT
v3.25.1

Concessions and Authorizations - Schedule of Resolutions For Adjustments On Gas Tariff (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024
N. 9, of January 25, 2024 |
IfrsStatementLineItems [Line Items] |
Resolution | N. 9, of January 25, 2024
Start of Term | February 1, 2024
N. 9, of January 25, 2024 | Low Voltage - Group B [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 1.06%
N. 9, of January 25, 2024 | High and Medium Voltage - Group A [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 3.77%
N. 17, of April 26, 2024 |
IfrsStatementLineItems [Line Items] |
Resolution | N. 17, of April 26, 2024
Start of Term | May 1, 2024
N. 17, of April 26, 2024 | Low Voltage - Group B [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 0.61%
N. 17, of April 26, 2024 | High and Medium Voltage - Group A [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 1.66%
N. 36, of July 26, 2024 |
IfrsStatementLineItems [Line Items] |
Resolution | N. 36, of July 26, 2024
Start of Term | August 1, 2024
N. 36, of July 26, 2024 | Low Voltage - Group B [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 4.00%
N. 36, of July 26, 2024 | High and Medium Voltage - Group A [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 6.00%
N. 51, of November 1, 2024 |
IfrsStatementLineItems [Line Items] |
Resolution | N. 51, of November 1, 2024
Start of Term | November 1, 2024
N. 51, of November 1, 2024 | Low Voltage - Group B [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 0.54%
N. 51, of November 1, 2024 | High and Medium Voltage - Group A [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of reduction of average values | 0.77%

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 Percentage of reduction of average values. + References No definition available. + Details
Name: | cig_PercentageOfReductionOfAverageValues
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Describes resolutions for adjustments on the gas tariff + References No definition available. + Details
Name: | cig_ResolutionsAdjustmentsGasTariff
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the resolutions adjustments gas tariff start of term. + References No definition available. + Details
Name: | cig_ResolutionsAdjustmentsGasTariffStartOfTerm
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cig_ApplicationPeriodAxis=cig_PeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_ApplicationPeriodAxis=cig_PeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_ApplicationPeriodAxis=cig_PeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_ApplicationPeriodAxis=cig_PeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |