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Reimbursement Of Tariff Subsidies - Additional Information (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Energy Development Account [line items]
Subsidies revenue recognized	R$ 953	R$ 842	R$ 792
Cemig D [member]
Disclosure Of Energy Development Account [line items]
Current subsidy receivable	82	73
Ceming GT [member]
Disclosure Of Energy Development Account [line items]
Current subsidy receivable	R$ 9	R$ 4

X

- Definition

Current subsidy receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of energy development account .

+ References

No definition available.

+ Details

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

X

- Definition

Subsidies revenue recognized.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=xcmig_CemigDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=xcmig_CemingGTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: