XML 155 R134.htm IDEA: XBRL DOCUMENT
v3.25.1

Leasing - Schedule of Discount Rates (Details) | 12 Months Ended
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Dec. 31, 2024
Up to five years [member] | Period 2024 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 6.78% |
Monthly rate | 0.55% |
Sixteen to thirty years [member] | Period 2024 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 6.73% |
Monthly rate | 0.57% |
Up to seven years [Member] | Period 2023 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 6.82% | [1]
Monthly rate | 0.55% |
Eight to nine years [Member] | Period 2023 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 6.90% |
Monthly rate | 0.56% |
Ten to twelve years [Member] | Period 2023 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 6.99% |
Monthly rate | 0.57% |
Thirteen to twenty-two years [Member] | Period 2023 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 7.19% |
Monthly rate | 0.58% |
Six to eleven years [member] | Period 2024 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Annual rate | 6.68% |
Monthly rate | 0.56% |
[1] | Monthly the Company calculates the addition to the rate to be applied to the new contracts. For the purposes of publication, these are presented at the average rates used.

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

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- 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

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

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cig_ApplicationPeriodAxis=cig_Period2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=cig_SixteenToThirtyYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=cig_UpToSevenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cig_ApplicationPeriodAxis=cig_Period2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=cig_EightToNineYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=cig_TenToTwelveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=cig_ThirteenToTwentyTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=cig_SixToElevenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |