XML 171 R164.htm IDEA: XBRL DOCUMENT v3.19.1

Loans, Financings and Debentures - Consolidated Totals of Funds Raised (Parenthetical) (Detail) - BRL (R$) R$ in Millions			1 Months Ended			12 Months Ended
	May 07, 2019	Dec. 14, 2017	Aug. 31, 2018	Jul. 31, 2018	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Borrowings amount						R$ 14,772	R$ 14,398
Taxes with no cash effect						10	10
Eurobonds						2,990	R$ 4,812
Principal maturity	April 15, 2022 to April 15, 2025
Non-convertible debentures amortisation period		36 months
Debt in Brazilian currency [member]
Disclosure of detailed information about borrowings [line items]
Eurobonds						R$ 1,042
Debt in Brazilian currency [member] | Floating rates [member]
Disclosure of detailed information about borrowings [line items]
Eurobonds								R$ 5,737
Non-convertible debentures maturity period						18 months
Annual remuneration percentage						1.75%
Debentures amortisation period						12 months
Debt in Foreign Currency [member]
Disclosure of detailed information about borrowings [line items]
Eurobonds						R$ 1,948
Gasmig [member] | Debt in Brazilian currency [member] | Floating rates [member]
Disclosure of detailed information about borrowings [line items]
Debenture maturity period			5 years
Annual remuneration percentage			1.50%
Eurobonds [member]
Disclosure of detailed information about borrowings [line items]
Principal maturity						2024
Eurobonds [member] | Debt in Foreign Currency [member]
Disclosure of detailed information about borrowings [line items]
Principal maturity						2021	2021
Eurobonds [member] | Debt in Foreign Currency [member] | Fixed rate [member]
Disclosure of detailed information about borrowings [line items]
Borrowings amount				R$ 500
Eurobonds				R$ 1,946		R$ 1,946	R$ 3,252
Annual financing cost				9.25%		9.25%	9.25%
Principal maturity				2024		2024	2024
Cemig Telecom [member]
Disclosure of detailed information about borrowings [line items]
Non-convertible debentures maturity period		4 years 6 months
Annual remuneration percentage		146.50%
Cemig Telecom [member] | Debt in Brazilian currency [member] | Floating rates [member]
Disclosure of detailed information about borrowings [line items]
Promissory note maturity period					18 months
Annual remuneration percentage					151.00%

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

+ Details

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

X

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_BorrowingsAdjustmentToInterestRateBasis
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Definition

Annual remuneration percentage

+ References

No definition available.

+ Details

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

X

- Definition

Debenture maturity period.

+ References

No definition available.

+ Details

Name:	xcmig_DebentureMaturityPeriod
Namespace Prefix:	xcmig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debentures amortisation period.

+ References

No definition available.

+ Details

Name:	xcmig_DebenturesAmortisationPeriod
Namespace Prefix:	xcmig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Financings obtained net of funding costs.

+ References

No definition available.

+ Details

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

X

- Definition

Non-convertible debentures amortisation period

+ References

No definition available.

+ Details

Name:	xcmig_NonconvertibleDebenturesAmortisationPeriod
Namespace Prefix:	xcmig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Non-convertible debentures maturity period

+ References

No definition available.

+ Details

Name:	xcmig_NonconvertibleDebenturesMaturityPeriod
Namespace Prefix:	xcmig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Promissory notes maturity period.

+ References

No definition available.

+ Details

Name:	xcmig_PromissoryNotesMaturityPeriod
Namespace Prefix:	xcmig_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Taxes with no cash effect.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=xcmig_DebtInBrazilianCurrencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FloatingInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=xcmig_DebtInForeignCurrencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FixedInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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