XML 163 R142.htm IDEA: XBRL DOCUMENT
v3.25.1

Taxes Payable and Amounts to be Refunded to Customers - Additional Information (Details) - BRL (R$) R$ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Taxes payable and amounts to be refunded to customers [Line items] |  |  |
Reversal of amounts to be refunded to consumers | R$ 411 | R$ (411) |
Cemig D [Member] |  |  |
Taxes payable and amounts to be refunded to customers [Line items] |  |  |
Amount refunded to consumers regarding credits |  | 209 | R$ 1,014
Gasmig [Member] |  |  |
Taxes payable and amounts to be refunded to customers [Line items] |  |  |
Amount refunded to consumers regarding credits |  | R$ 143 | R$ 163

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- Definition The amount of consumer refunds reversed. + References No definition available. + Details
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- Definition Amount refunded to consumers regarding credits + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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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Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
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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: |