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Intangible Assets - Schedule of Allocation for Amortization Expense (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Allocation Of Amortisation Expenses [abstract] |  |  |
Cost of goods sold | $ 317 | $ 399 | $ 132
Administrative expenses | 953 | 858 | 627
Selling expenses | 542 | 656 | 500
Total | $ 1,812 | $ 1,913 | $ 1,259

X
- Definition Amortisation expense reported in administrative expenses. + References No definition available. + Details
Name: | fmx_AmortisationExpenseReportedInAdministrativeExpenses
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortisation expense reported in cost of goods sold. + References No definition available. + Details
Name: | fmx_AmortisationExpenseReportedInCostOfGoodsSold
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortisation expense reported in selling expenses. + References No definition available. + Details
Name: | fmx_AmortisationExpenseReportedInSellingExpenses
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Abstract of allocation of amortisation expenses. + References No definition available. + Details
Name: | fmx_DisclosureOfAllocationOfAmortisationExpensesAbstract
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_AmortisationExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration