XML 182 R167.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes - Schedule of Deferred Tax related to Accumulated Other Comprehensive Income (AOCI) (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Major components of tax expense (income) [abstract] |  |
Unrealized loss on derivative financial instruments | $ 641 | $ 847
Remeasurements of the net defined benefit liability | (402) | (306)
Total deferred tax loss (income) related to AOCI | $ 239 | $ 541

X
- Definition Deferred tax expense (income) relating to components of accumulated other comprehensive income. + References No definition available. + Details
Name: | fmx_DeferredTaxExpenseIncomeRelatingToComponentsOfAccumulatedOtherComprehensiveIncome
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deferred Tax Relating To Remeasurements Of Defined Benefit Liability accumulated Other Comprehensive Income + References No definition available. + Details
Name: | fmx_DeferredTaxRelatingToRemeasurementsOfDefinedBenefitLiabilityAccumulatedOtherComprehensiveIncome
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrealized Losses On Derivative Financial Instruments Accumulated Other Comprehensive Income + References No definition available. + Details
Name: | fmx_UnrealizedLossesOnDerivativeFinancialInstrumentsAccumulatedOtherComprehensiveIncome
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_MajorComponentsOfTaxExpenseIncomeAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration