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Operating Costs And Expenses - Summary of Outsourced Services (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information of outsourced services [Abstract] |  |  |
Meter reading and bill delivery | R$ 142 | R$ 140 | R$ 122
Communication | 66 | 55 | 64
Maintenance and conservation of electrical facilities and equipment | 266 | 246 | 238
Building conservation and cleaning | 108 | 97 | 100
Contracted labor | 15 | 13 | 6
Freight and airfares | 8 | 7 | 10
Accommodation and meals | 13 | 13 | 17
Security services | 23 | 25 | 28
Consultancy | 16 | 15 | 17
Maintenance and conservation of furniture and utensils | 4 | 4 | 4
Information technology | 62 | 49 | 42
Maintenance and conservation of vehicles | 2 | 8 | 11
Disconnection and reconnection | 35 | 7 | 26
Environment | 11 | 19 | 22
Legal services | 22 | 26 | 21
Legal procedural costs | 3 | 4 | 3
Tree pruning | 21 | 14 | 23
Cleaning of power line pathways | 16 | 8 | 30
Copying and legal publications | 23 | 16 | 14
Inspection of customer units | 1 | 1 | 4
Printing of tax invoices and energy bills | 3 | 3 | 4
Other expenses | 114 | 97 | 93
Outsourced services | R$ 974 | R$ 867 | R$ 899

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

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

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

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

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

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

X
- Definition Copying and legal publications. + References No definition available. + Details
Name: | xcmig_CopyingAndLegalPublications
Namespace Prefix: | xcmig_
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: | xcmig_DisclosureOfDetailedInformationOfOutsourcedServicesAbstract
Namespace Prefix: | xcmig_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Disconnection and reconnection. + References No definition available. + Details
Name: | xcmig_DisconnectionAndReconnection
Namespace Prefix: | xcmig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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

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

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

X
- Definition Legal services and procedural costs. + References No definition available. + Details
Name: | xcmig_LegalServicesAndProceduralCosts
Namespace Prefix: | xcmig_
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: | xcmig_MaintenanceAndConservationOfElectricalFacilitiesAndEquipment
Namespace Prefix: | xcmig_
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: | xcmig_MaintenanceAndConservationOfFurnitureAndUtensils
Namespace Prefix: | xcmig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

X
- Definition Other expenses 1. + References No definition available. + Details
Name: | xcmig_OtherExpenses1
Namespace Prefix: | xcmig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Printing Of Tax Invoices And Energy Bills + References No definition available. + Details
Name: | xcmig_PrintingOfTaxInvoicesAndEnergyBills
Namespace Prefix: | xcmig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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