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28. OPERATING COSTS AND EXPENSES (Details 1) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information of outsourced services [abstract] |  |  |
Meter reading and bill delivery | R$ 127 | R$ 128 | R$ 129
Communication | 71 | 69 | 80
Maintenance and conservation of electrical facilities and equipment | 443 | 404 | 323
Building conservation and cleaning | 108 | 110 | 110
Contracted labor | 9 | 17 | 21
Freight and airfares | 2 | 7 | 7
Accommodation and meals | 9 | 14 | 12
Security services | 19 | 18 | 20
Consultant | 41 | 24 | 16
Maintenance and conservation of furniture and utensils | 6 | 5 | 4
Information technology | 80 | 63 | 59
Maintenance and conservation of vehicles | 2 | 3 | 2
Disconnection and reconnection | 39 | 70 | 62
Environmental services | 10 | 14 | 14
Legal services | 21 | 28 | 27
Tree pruning | 48 | 46 | 28
Cleaning of power line pathways | 75 | 61 | 41
Copying and legal publications | 17 | 21 | 21
Inspection of customer units | 35 | 14 | 10
Other expenses | 103 | 123 | 101
Outsourced services | R$ 1,265 | R$ 1,239 | R$ 1,087

X
- Definition Accommodation and meals. + References No definition available. + Details
Name: | cig_AccommodationAndMeals
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Building conservation and cleaning services. + References No definition available. + Details
Name: | cig_BuildingConservationAndCleaningServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cleaning of power line pathways. + References No definition available. + Details
Name: | cig_CleaningOfPowerLinePathways
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Communication services. + References No definition available. + Details
Name: | cig_CommunicationServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Consultancy services. + References No definition available. + Details
Name: | cig_ConsultancyServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contracted labor. + References No definition available. + Details
Name: | cig_ContractedLabor
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Copying and legal publications. + References No definition available. + Details
Name: | cig_CopyingAndLegalPublications
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Disclosure of detailed information of outsourced services. + References No definition available. + Details
Name: | cig_DisclosureOfDetailedInformationOfOutsourcedServicesAbstract
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disconnection and reconnection. + References No definition available. + Details
Name: | cig_DisconnectionAndReconnection
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Environment. + References No definition available. + Details
Name: | cig_Environment
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Freight and airfares. + References No definition available. + Details
Name: | cig_FreightAndAirfareServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Information technology. + References No definition available. + Details
Name: | cig_InformationTechnology
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Inspection Of Customer Units + References No definition available. + Details
Name: | cig_InspectionOfCustomerUnits
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Legal services + References No definition available. + Details
Name: | cig_LegalServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maintenance and conservation of electrical facilities and equipment. + References No definition available. + Details
Name: | cig_MaintenanceAndConservationOfElectricalFacilitiesAndEquipment
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maintenance and conservation of furniture and utensils. + References No definition available. + Details
Name: | cig_MaintenanceAndConservationOfFurnitureAndUtensils
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maintenance and conservation of vehicles. + References No definition available. + Details
Name: | cig_MaintenanceAndConservationOfVehicles
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Meter reading and bill delivery. + References No definition available. + Details
Name: | cig_MeterReadingAndBillDelivery
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Outsourced services Expenses + References No definition available. + Details
Name: | cig_OtherOutsourcedServicesExpenses
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Outsourced services expense. + References No definition available. + Details
Name: | cig_OutsourcedServicesExpense
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Security services. + References No definition available. + Details
Name: | cig_SecurityServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tree pruning. + References No definition available. + Details
Name: | cig_TreePruning
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration