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v3.25.1

Taxes - Narrative (Details) $ in Millions | 1 Months Ended
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Dec. 31, 2024 MXN ($)
Disclosure of income taxes [Line Items] |
Gains (losses) on disposal of subsidiary | $ 282

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- Definition Line items represent concepts included in income taxes. + References No definition available. + Details
Name: | fmx_DisclosureOfIncomeTaxesLineItems
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gains (Losses) On Disposal Of Subsidiary + References No definition available. + Details
Name: | fmx_GainsLossesOnDisposalOfSubsidiary
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration