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Information by Segment - Summary of Inter Segment Policies for Segment (Parenthetical) (Detail) - Mexico and Central America [member] $ in Millions | Dec. 31, 2017 MXN ($)
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Disclosure of operating segments [line items] |
Assets of discontinued operations | $ 28,272
Liabilities of discontinued operations | $ 9,945

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- Definition ASSETS discontinued operations + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition LIABILITIES discontinued operations + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |