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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details Narrative) R$ in Millions	12 Months Ended
	Dec. 31, 2019 BRL (R$)
Cemig Distribuicao SA [Member]
Disclosure Of Advances From Customers [line items]
Reduction in doubtful accounts	R$ 46

X

- Definition

The amount of reduction in doubtful accounts.

+ References

No definition available.

+ Details

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X

- Definition

Disclosure Of Advances From Customers [line items]

+ References

No definition available.

+ Details

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Namespace Prefix:	cig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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