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Revenue - Schedule of Revenue from Energy Supply (Parenthetical) (Details) - MW MW in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |  |
Supply of electricity in MWh | [1] | 45,769 | 44,865 | 43,229
Distributed generation market |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Supply of electricity in MWh |  | 3,910,204 | 2,672,285 |
[1] | Data not audited by external auditors.

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- Definition Ifrs Statement Line Items + References No definition available. + Details
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- Definition Represent information about the supply of electricity gross. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |