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Material Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details) - MXN ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Material Accounting Policies [Abstract] |  |
Short-term deposits, classified as cash equivalents | $ 3,971 | $ 2,315

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- Definition Significant Accounting Policies [Abstract] + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant