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Regulatory Charges - Disclosure of Information About Amounts Recognised in Relation to Regulatory Deferral Account Balances (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Liabilities
Energy Development Account (CDE)	R$ 122	R$ 206
Regulator inspection fee - ANEEL	2	2
Energy Efficiency Program	258	224
Research and development	225	233
Energy System Expansion Research	2	3
National Scientific and Technological Development Fund	5	5
Proinfa - Alternative Energy Program	7	7
Royalties for use of water resources	6	15
Emergency capacity charge	31	31
Others	6
Liability	693	763
Current liabilities	514	513
Non-current liabilities	179	250
Regulatory Assets [member]
Liabilities
Global Reversion Reserve (RGR)	R$ 29	R$ 37

X

- Definition

The amount of regulatory deferral account credit balances and the related deferred tax liability. [Refer: Regulatory deferral account credit balances; Deferred tax liability associated with regulatory deferral account balances]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 14
-IssueDate 2018-01-01
-Paragraph 24
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2018-03-01&anchor=para_24&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 14
-IssueDate 2018-01-01
-Paragraph B11
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2018-03-01&anchor=para_B11_a&doctype=Appendix&seq=2
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_RegulatoryDeferralAccountCreditBalancesAndRelatedDeferredTaxLiability
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_RegulatoryDeferralAccountCreditBalancesAndRelatedDeferredTaxLiabilityAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2018-01-01
-Paragraph 126
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_126&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Aneel inspection charge.

+ References

No definition available.

+ Details

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

X

- Definition

Current regulatory liability.

+ References

No definition available.

+ Details

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

X

- Definition

Emergency capacity charge.

+ References

No definition available.

+ Details

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

X

- Definition

Energy development account.

+ References

No definition available.

+ Details

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

X

- Definition

Energy efficiency program.

+ References

No definition available.

+ Details

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

X

- Definition

Energy system expansion research.

+ References

No definition available.

+ Details

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

X

- Definition

Global reversion reserve.

+ References

No definition available.

+ Details

Name:	xcmig_GlobalReversionReserve
Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

National scientific and technological development fund.

+ References

No definition available.

+ Details

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

X

- Definition

Noncurrent regulatory liability.

+ References

No definition available.

+ Details

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

X

- Definition

Other current regulatory liability.

+ References

No definition available.

+ Details

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

X

- Definition

Proinfa alternative energy program.

+ References

No definition available.

+ Details

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

X

- Definition

Royalties for use of water resources.

+ References

No definition available.

+ Details

Name:	xcmig_RoyaltiesForUseOfWaterResources
Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfRateregulatedActivitiesAxis=xcmig_RegulatoryAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: