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Intangible Assets - Amortization (Details) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Allocation Of Amortisation Expenses [abstract] |  |  |
Amortisation Expense Reported in Cost of Goods Sold | $ 254 | $ 288 | $ 317
Amortisation Expense Reported in Administrative Expenses | 1,630 | 1,412 | 953
Amortisation Expense Reported in Selling Expenses | 810 | 765 | 542
Amortization expense | $ 2,694 | $ 2,465 | $ 1,812

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

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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration