XML 39 R73.htm IDEA: XBRL DOCUMENT
v3.20.1

Significant Accounting Policies - Disclosure of Estimated Useful Lives of Company's Assets (Detail) | 12 Months Ended
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Dec. 31, 2019
Leasehold improvements [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 15 years
Bottom of range [member] | Buildings [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 25 years
Bottom of range [member] | Machinery and equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 10 years
Bottom of range [member] | Distribution equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 7 years
Bottom of range [member] | Refrigeration equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 5 years
Bottom of range [member] | Returnable bottles [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 1 year 6 months
Bottom of range [member] | Information technology equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 3 years
Bottom of range [member] | Other equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 3 years
Top of range [member] | Buildings [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 50 years
Top of range [member] | Machinery and equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 20 years
Top of range [member] | Distribution equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 15 years
Top of range [member] | Refrigeration equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 7 years
Top of range [member] | Returnable bottles [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 3 years
Top of range [member] | Information technology equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 5 years
Top of range [member] | Other equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful lives of principal assets | 10 years

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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 useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_c&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:durationItemType
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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: |

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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_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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_ClassesOfPropertyPlantAndEquipmentAxis=fmx_DistributionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fmx_RefrigerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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