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RECEIVABLES FROM CUSTOMERS, TRADERS AND CONCESSION HOLDERS (Details Narrative) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 BRL (R$)
Debts | R$ 222
Installment amount | 11
Remaining outstanding | R$ 127

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

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

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