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v3.22.1

Schedule of assets and liabilities classified as held for sale (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Assets held for sale – investment in an affiliate (Light) |  | R$ 1,258
Assets held for sale – investment in an jointly controlled (Renova) |  |
Net income after taxes - discontinued operations |  | R$ 1,258

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- References No definition available. + Details
Name: | cig_AssetsHeldForSaleInvestmentInAffiliateLight
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | cig_AssetsHeldForSaleInvestmentInJointlycontrolledRenova
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of net income after taxes - discontinued operations. + References No definition available. + Details
Name: | cig_NetIncomeAfterTaxesDiscontinuedOperations
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration