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Concession Financial Assets and Liabilities - Summary of Financial Assets and Financial Liabilities With the Tariff Adjustments (Parenthetical) (Detail)	Dec. 31, 2017 BRL (R$)
CVA account for compensation of changes in portion A costs [member]
Disclosure Of Financial Assets and Financial Liabilities [line items]
Excess on energy reserve account	R$ 254

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- Definition

Disclosure Of Financial Assets and Financial Liabilities [line items]

+ References

No definition available.

+ Details

Name:	xcmig_DisclosureOfFinancialAssetsAndFinancialLiabilitiesLineItems
Namespace Prefix:	xcmig_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Excess on energy reserve account

+ References

No definition available.

+ Details

Name:	xcmig_ExcessOnEnergyReserveAccount
Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	ifrs-full_AssetsAndLiabilitiesAxis=xcmig_CVAAccountForCompensationOfChangesInPortionACostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: