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Financial Instruments - Summary of Cash Flows Hedge Exposures (Detail) - Foreign exchange currency risk [member] - Purchase of stock [member] - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about hedged items [line items] |  |
Cash flow hedge reserve | $ 1 |
Cash flow hedge costs | $ 22 | $ 11

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- Definition Cash flow hedge costs. + 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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ifrs-full_HedgedItemsAxis=fmx_PurchaseOfStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |