XML 241 R223.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Financial Instruments and Risk Management - Schedule Of Fair Value Of Derivative Hedge Instrument One (Parenthetical) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 R$ / shares
Probable Scenario [Member] |
Disclosure of financial liabilities [line items] |
Net foreign exchange gain per share | R$ 4.98
Adverse Scenario [Member] |
Disclosure of financial liabilities [line items] |
Net foreign exchange gain per share | R$ 6

X
- Definition Net foreign exchange gain per share. + References No definition available. + Details
Name: | cig_NetForeignExchangeGainPerShare
Namespace Prefix: | cig_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_ProbableScenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_AdverseScenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |