XML 137 R130.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Suppliers - Summary of Suppliers (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of trade payables [Line Items] |  |
Total Suppliers | R$ 2,343 | R$ 1,940
Energy on spot market - CCEE [member] |  |
Disclosure of trade payables [Line Items] |  |
Total Suppliers | 468 | 168
Charges for use of energy network [member] |  |
Disclosure of trade payables [Line Items] |  |
Total Suppliers | 153 | 78
Energy purchased for resale [member] |  |
Disclosure of trade payables [Line Items] |  |
Total Suppliers | 871 | 677
Supply From Itaipu Binacional [member] |  |
Disclosure of trade payables [Line Items] |  |
Total Suppliers | 240 | 207
Gas Distribution [member] |  |
Disclosure of trade payables [Line Items] |  |
Total Suppliers | 187 | 462
Materials and Service Suppliers [member] |  |
Disclosure of trade payables [Line Items] |  |
Total Suppliers | R$ 424 | R$ 348

X
- Definition The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 70 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_70&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represents information of trade payables. + References No definition available. + Details
Name: | xcmig_DisclosureOfTradePayablesLineItems
Namespace Prefix: | xcmig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=xcmig_EnergyOnSpotMarketCmaraDeComercializaoDeEnergiaEltricaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=xcmig_ChargesForUseOfEnergyNetworkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=xcmig_EnergyDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=xcmig_ItaipuBinacionalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=ifrs-full_GasDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=xcmig_MaterialsAndServiceSuppliersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |