XML 94 R87.htm IDEA: XBRL DOCUMENT v3.19.1

Principles of Consolidation - Schedule of Companies Direct Equity Investments (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Light [member]
Disclosure of subsidiaries [line items]
Percentage of ownership interest in entities wholly owned directly or indirectly	49.99%

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

X

- Definition

Percentage of ownership interest in entities wholly owned directly or indirectly.

+ References

No definition available.

+ Details

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

X

- Details

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