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