XML 210 R174.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of outsourced services (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Costs And Expenses |  |  |
Meter reading and bill delivery | R$ 134 | R$ 127 | R$ 128
Communication | 148 | 116 | 69
Maintenance and conservation of electrical facilities and equipment | 485 | 443 | 404
Building conservation and cleaning | 72 | 63 | 110
Security services | 17 | 19 | 18
Audit and consultant | 43 | 41 | 24
Information technology | 93 | 80 | 63
Disconnection and reconnection | 82 | 39 | 70
Legal services | 32 | 21 | 28
Tree pruning | 46 | 48 | 46
Cleaning of power line pathways | 92 | 75 | 61
Copying and legal publications | 18 | 17 | 21
Inspection of customer units | 33 | 35 | 14
Other expenses | 155 | 141 | 183
Outsourced services | R$ 1,450 | R$ 1,265 | R$ 1,239

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 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
- References No definition available. + Details
Name: | cig_DisclosureOperatingCostsAndExpensesAbstract
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 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 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