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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) - R$ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of changes in equity [abstract]
Statutory dividends per share	R$ 0.52	R$ 0.59	R$ 0.51

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- Definition

Statutory dividend per share declared.

+ References

No definition available.

+ Details

Name:	cig_StatutoryDividendPerShareDeclared
Namespace Prefix:	cig_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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