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Balances and Transactions with Related Parties and Affiliated Companies - Commitments with Related Parties (Parenthetical) (Detail) - Heineken [member] | 12 Months Ended
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Dec. 31, 2017
Disclosure of transactions between related parties [line items] |
Renewal option for supply contract | 5 years
Restriction period from holding exclusive contract with another supplier at the end of the contract term | 3 years

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- Definition Restriction period for related party transaction. + References No definition available. + Details
Name: | fmx_RestrictionPeriodForRelatedPartyTransaction
Namespace Prefix: | fmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of renewal option for related party transaction. + References No definition available. + Details
Name: | fmx_TermOfRenewalOptionForRelatedPartyTransaction
Namespace Prefix: | fmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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_HeinekenGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |