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v3.25.1

Intangible Assets - Schedule of Changes in Intangible Assets (Parenthetical) (Details) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Intangible Assets |  |  |
Transfers of concession contract assets to intangible assets | R$ 2,517 | R$ 1,590 | R$ 2,448

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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
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfIntangibleAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration