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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 10) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net profit allocated to non-controlling interests	R$ 1	R$ 1
GASMIG [Member]
Net profit allocated to non-controlling interests	R$ 1	R$ 1

X

- Definition

Represent information about the net profit allocated to noncontrolling interests.

+ References

No definition available.

+ Details

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Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: