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Taxes Payable and Amounts to be Refunded to Customers - Additional Information (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Taxes payable and amounts to be refunded to customers [Line items] |  |
Amount refunded | R$ 5,852 | R$ 3,225
Tax credit reduced amount | 67 |
Tax credit amount corresponds to original credit | 23 |
Cemig D [Member] |  |
Taxes payable and amounts to be refunded to customers [Line items] |  |
Amount refunded to consumers regarding credits | 1,014 | 2,787
Gasmig [Member] |  |
Taxes payable and amounts to be refunded to customers [Line items] |  |
Amount refunded to consumers regarding credits | R$ 163 | R$ 176

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- Definition Amount refunded. + References No definition available. + Details
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Namespace Prefix: | cig_
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Balance Type: | credit
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- Definition Amount refunded to consumers regarding credits + References No definition available. + Details
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Namespace Prefix: | cig_
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Balance Type: | credit
Period Type: | duration

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- Definition Tax credit amount corresponds to original credit + References No definition available. + Details
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Balance Type: | credit
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- Definition Tax credit reduced amount + References No definition available. + Details
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- Definition Taxes payable and amounts to be refunded to customers [Line items] + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_GasmigMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |