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Balances and transactions with related parties and affiliated companies - Additional Information (Detail) - MXN ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
The Coca-Cola company [member] |  |
Disclosure of transactions between related parties [line items] |  |
Purchase of goods | $ 17,238 | $ 17,978
Heineken [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Purchase of goods | 15,682 | 15,622
Jugos del Valle, S.A.P.I. de C.V. [member] |  |
Disclosure of transactions between related parties [line items] |  |
Purchase of goods | $ 2,110 | $ 2,359

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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 The amount of goods purchased by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_a&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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