XML 207 R186.htm IDEA: XBRL DOCUMENT v3.25.1

Revenue - Schedule of Revenue from Energy Supply (Parenthetical) (Details) - MW MW in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
IfrsStatementLineItems [Line Items]
Supply of electricity in MWh	50,554	49,688	47,518

X

- Definition

Ifrs Statement Line Items

+ References

No definition available.

+ Details

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

X

- Definition

Represent information about the supply of electricity gross.

+ References

No definition available.

+ Details

Name:	cig_SupplyOfElectricityGross
Namespace Prefix:	cig_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	duration