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Escrow Deposits - Additional Information (Detail) - BRL (R$) R$ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cemig D [member]
Disclosure of escrow deposits [line items]
Escrow deposits	R$ 1,149	R$ 1,110
Ceming GT [member]
Disclosure of escrow deposits [line items]
Reversed provision amount with effect on the net income for previous year	101
Escrow deposits	R$ 201	R$ 184

X

- Definition

Amount in escrow deposits

+ References

No definition available.

+ Details

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

X

- Definition

Line items represents information about escrow deposits.

+ References

No definition available.

+ Details

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

X

- Definition

Reversed provision amount with effect on net profit.

+ References

No definition available.

+ Details

Name:	xcmig_ReversedProvisionAmountWithEffectOnNetProfit
Namespace Prefix:	xcmig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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: