XML 164 R157.htm IDEA: XBRL DOCUMENT v3.19.1

Taxes, Amounts to be Restituted to Customers, Income Tax and Social Contribution - Summary of Taxes and Amounts to be Restituted to Customers (Parenthetical) (Detail) - Cemig D [member] - PRCT [member] R$ in Millions	12 Months Ended
	Dec. 31, 2018 BRL (R$) Installment
Disclosure of taxes payable [line items]
Tax credits regularization amout | R$	R$ 557
Percentage of reduction in interest and penalty payments	90.00%
Number of installments | Installment	6
Selic rate	50.00%

X

- Definition

Disclosure of taxes payable [line items].

+ References

No definition available.

+ Details

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

X

- Definition

Number of installments

+ References

No definition available.

+ Details

Name:	xcmig_NumberOfInstallments
Namespace Prefix:	xcmig_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of tax liability excluding interest and penalty.

+ References

No definition available.

+ Details

Name:	xcmig_PercentageOfTaxLiabilityExcludingInterestAndPenalty
Namespace Prefix:	xcmig_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Selic rate.

+ References

No definition available.

+ Details

Name:	xcmig_SelicRate
Namespace Prefix:	xcmig_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax credits regularization plan amount.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

Name:	xcmig_DeferredTaxAssetsAndLiabilitiesAxis=xcmig_PrctMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: