XML 142 R127.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Benefits - Summary of Net Defined Benefit Liability Asset (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | $ 408 | $ 359 | $ 343
Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 4,239 | 3,486 |
Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 674 | 561 |
Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 460 | 400 |
Net benefit cost recognized in the consolidated statements of income [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 471 | 359 | 343
Past service cost | 10 | 45 | 3
Gain or Loss on Settlement or Curtailment | (3) | (61) | (129)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 338 | 282 | 276
Net benefit cost recognized in the consolidated statements of income [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 341 | 245 | 233
Past service cost | 10 | 45 | 3
Gain or Loss on Settlement or Curtailment | (2) | (61) | (120)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 267 | 224 | 212
Net benefit cost recognized in the consolidated statements of income [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 106 | 93 | 88
Gain or Loss on Settlement or Curtailment | (1) |  | (9)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 41 | 34 | 32
Net benefit cost recognized in the consolidated statements of income [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 24 | 21 | 16
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 30 | $ 24 | $ 23
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 447 |  |
Past service cost | 9 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 338 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 322 |  |
Past service cost | 9 |  |
Gain or Loss on Settlement or Curtailment | (2) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 264 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 102 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 41 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 23 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 33 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 467 |  |
Past service cost | 10 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 329 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 355 |  |
Past service cost | 10 |  |
Gain or Loss on Settlement or Curtailment | (2) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 286 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 112 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 43 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in the consolidated statements of income [member] | Medical cost trend rates [Member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 26 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 33 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,511 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,289 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 44 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 178 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,538 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,496 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 42 |  |
Discount rate +0.5% [member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Medical cost trend rates [Member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 265 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 492 |  |
Past service cost | 10 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 339 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 355 |  |
Past service cost | 10 |  |
Gain or Loss on Settlement or Curtailment | (2) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 268 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 111 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 40 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 26 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 31 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 423 |  |
Past service cost | 9 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 291 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 323 |  |
Past service cost | 9 |  |
Gain or Loss on Settlement or Curtailment | (2) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 253 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 100 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 38 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in the consolidated statements of income [member] | Medical cost trend rates [Member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 23 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 28 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,819 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,506 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 46 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 267 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,347 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,291 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 56 |  |
Discount Rate -0.5% [Member] | Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Medical cost trend rates [Member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | $ 179 |  |

X
- Definition Gains (losses) arising from settlements or curtailments net defined benefit liability asset. + References No definition available. + Details
Name: | fmx_GainsLossesArisingFromSettlementsOrCurtailmentsNetDefinedBenefitLiabilityAsset
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_LiabilityAssetOfDefinedBenefitPlans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PastServiceCostNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

X
- Details
Name: | ifrs-full_ConsolidatedAndSeparateFinancialStatementsAxis=fmx_NetBenefitCostRecognizedInTheConsolidatedStatementsOfIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=fmx_DiscountRatePlusZeroPointFivePercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfDiscountRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfMedicalCostTrendRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ConsolidatedAndSeparateFinancialStatementsAxis=fmx_NetBenefitCostRecognizedInConsolidatedStatementsOfOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=fmx_DiscountRateMinusZeroPointFivePercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |