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Intangible Assets - Schedule of Changes in Intangible Assets (Parenthetical) (Details) - BRL (R$) R$ in Millions	12 Months Ended
	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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration