XML 244 R237.htm IDEA: XBRL DOCUMENT v3.19.1

Financial Instruments and Risk Management - Summary of Fair Value of Derivative Hedge Instrument (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		R$ 16,279	R$ 16,866
CVA and Other financial components (Note 15) - SELIC		18,120	R$ 19,556
Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument		1,150
Swap [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
CVA and Other financial components (Note 15) - SELIC		(43)
Option / Call spread [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		1,200
Book value [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		4,594
CVA and Other financial components (Note 15) - SELIC		(4,821)
Derivative hedge instrument		(227)
Book value [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument		813
Book value [member] | Swap [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		5,981
CVA and Other financial components (Note 15) - SELIC		(6,095)
Book value [member] | Option / Call spread [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		927
Probable scenario [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	R$ 4,782
CVA and Other financial components (Note 15) - SELIC	(5,018)
Derivative hedge instrument	(236)
Probable scenario [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument		1,153
Probable scenario [member] | Swap [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		5,934
CVA and Other financial components (Note 15) - SELIC		(5,977)
Probable scenario [member] | Option / Call spread [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		1,196
Possible scenario [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	4,830
CVA and Other financial components (Note 15) - SELIC	(5,067)
Derivative hedge instrument	(237)
Possible scenario [member] | Depreciation of 25% on Brazil real [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument		(667)
Possible scenario [member] | Depreciation of 25% on Brazil real [member] | Swap [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		4,875
CVA and Other financial components (Note 15) - SELIC		(6,130)
Possible scenario [member] | Depreciation of 25% on Brazil real [member] | Option / Call spread [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		588
Remote scenario [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets	4,878
CVA and Other financial components (Note 15) - SELIC	(5,117)
Derivative hedge instrument	R$ (239)
Remote scenario [member] | Depreciation of 50% on Brazil real [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument		(2,155)
Remote scenario [member] | Depreciation of 50% on Brazil real [member] | Swap [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		3,921
CVA and Other financial components (Note 15) - SELIC		(6,269)
Remote scenario [member] | Depreciation of 50% on Brazil real [member] | Option / Call spread [member] | Ceming GT [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative hedge instrument, Assets		R$ 193

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

X

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 35H
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 35I
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard
-URIDate 2018-03-16

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 35M
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard
-URIDate 2018-03-16

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_FinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard
-URIDate 2018-03-16

+ Details

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

X

- Definition

The amount of assets less the amount of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 1
-IssueDate 2018-01-01
-Paragraph IG63
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2018-03-01&anchor=para_IG63&doctype=Implementation%20Guidance
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_NetAssetsLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	xcmig_ClassesOfFinancialAssetsLiabilitiesAxis=xcmig_SwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	xcmig_ClassesOfFinancialAssetsLiabilitiesAxis=xcmig_CallSpreadOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=ifrs-full_AtCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=xcmig_ProbableScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=xcmig_PossibleScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	xcmig_ExchangeRateDepreciationAxis=xcmig_DepreciationOfTwentyFivePercentageOnBrazilRealMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=xcmig_RemoteScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	xcmig_ExchangeRateDepreciationAxis=xcmig_DepreciationOfFiftyPercentageOnBrazilRealMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: