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29. REVENUE (Details Narrative) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue [abstract]
Transmission concession revenue	R$ 15	R$ 13
Variable portion of transmission revenue	R$ 9	R$ 11

X

- Definition

Transmission concession revenue.

+ References

No definition available.

+ Details

Name:	cig_TransmissionConcessionRevenue
Namespace Prefix:	cig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represent information about the variable portion of transmission revenue.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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