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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 10) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Net profit allocated to non-controlling interests | R$ 1 | R$ 1
GASMIG [Member] |  |
Net profit allocated to non-controlling interests | R$ 1 | R$ 1

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- Definition Represent information about the net profit allocated to noncontrolling interests. + References No definition available. + Details
Name: | cig_NetProfitAllocatedToNoncontrollingInterests
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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