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Intangible Assets - Schedule of Changes in Intangible Assets (Parenthetical) (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Intangible Assets |  |
Transfers of concession contract assets to intangible assets | R$ 2,448 | R$ 902

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- Definition Intangible Assets Abstract + References No definition available. + Details
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Namespace Prefix: | cig_
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Balance Type: | na
Period Type: | duration

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- Definition Transfers of concession contract assets to intangible assets. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
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