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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Transaction with Related Parties (Parenthetical) (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
The Coca-Cola company [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Contributions | $ 4,023 | $ 4,518 | $ 3,749

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- Definition Contributions due from related parties. + References No definition available. + Details
Name: | fmx_ContributionsDueFromRelatedParties
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=fmx_CocaColaCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |