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Assets And Liabilities Classified As Held For Sale; Profit (Loss) From Discontinued Operations - Additional Information (Parenthetical) (Detail) R$ in Millions	Dec. 31, 2018 BRL (R$)
Disclosure of assets and liabilities classified as held for sale [abstract]
Provision for litigation settlement	R$ 476,244
Litigation settlement amount related to Civil Lawsuit	909
Litigation settlement amount related to labor lawsuit	320
Litigation settlement amount related to tax lawsuit	R$ 4,467

X

- Definition

Disclosure of assets and liabilities classified as held for sale.

+ References

No definition available.

+ Details

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

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- Definition

Litigation settlement amount related to civil lawsuit.

+ References

No definition available.

+ Details

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

X

- Definition

Litigation settlement amount related to labor lawsuit.

+ References

No definition available.

+ Details

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

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- Definition

Litigation settlement amount related to tax lawsuit.

+ References

No definition available.

+ Details

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

X

- Definition

Provision for litigation settlement.

+ References

No definition available.

+ Details

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