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Taxes Payable and Amounts to be Refunded to Customers - Schedule of Taxes and Amounts to be Refunded to Customers (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Taxes Payable and Amounts to be Refunded to Customers |  |
Beginning Balance | R$ 3,304 | R$ 3,023
ICMS to be refunded |  | 341
Refund to consumers | (1,909) | (2,360)
Additional tax credits - Law 14.385/2022 |  | 1,419
Financial adjustments - Selic | 190 | 881
Federal Revenue Inspection | (67) |
Ending balance | R$ 1,518 | R$ 3,304

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- Definition Additional tax credits. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Federal revenue inspection. + References No definition available. + Details
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Namespace Prefix: | cig_
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Balance Type: | credit
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- Definition Financial adjustments selic. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
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- Definition ICMS to be refunded. + References No definition available. + Details
Name: | cig_ICMSToBeRefunded
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Pasep and Cofins taxes to be reimbursed to customers. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
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- Definition Refund to consumers. + References No definition available. + Details
Name: | cig_RefundToConsumers
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Taxes Payable And Amounts To Be Refunded To Customers Abstract + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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