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Intangible Assets - Amortization (Details) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Allocation Of Amortisation Expenses [abstract] |  |  |
Cost of goods sold | $ 1,229 | $ 207 | $ 254
Administrative expenses | 1,257 | 1,771 | 1,630
Selling expenses | 809 | 718 | 810
Amortization expense | $ 3,295 | $ 2,696 | $ 2,694

X
- Definition Amortisation expense reported in administrative expenses. + References No definition available. + Details
Name: | fmx_AmortizationExpenseReportedInAdministrativeExpenses
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_AmortizationExpenseReportedInCostOfGoodsSold
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_AmortizationExpenseReportedInSellingExpenses
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_DisclosureOfAllocationOfAmortizationExpensesAbstract
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 2023-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration