XML 169 R162.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Post-Retirement Obligation- Summary of Sensitivity Analysis of the Effects of Changes in the Principal Actuarial Assumptions Used to Determine the Defined-benefit Obligation (Parenthetical) (Detail) | Dec. 31, 2017
--- | ---
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate | 1.00%
Pension plans and retirement supplement plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate | 1.00%
Health plan [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate | 1.00%
Dental plan [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate | 1.00%
Life insurance [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate | 1.00%

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

X
- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=xcmig_PensionAndRetirementSupplementPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=xcmig_HealthPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=xcmig_DentalPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=xcmig_LifeInsurancePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |