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v3.21.1

Employee Benefits - Expected Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2020 MXN ($)
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Disclosure of defined benefit plans [line items] |
2021 | $ 926
2022 | 531
2023 | 581
2024 | 599
2025 | 705
2026 to 2030 | 4,108
Pension and retirement plans [member] |
Disclosure of defined benefit plans [line items] |
2021 | 702
2022 | 335
2023 | 384
2024 | 398
2025 | 496
2026 to 2030 | 3,118
Seniority premiums [member] |
Disclosure of defined benefit plans [line items] |
2021 | 198
2022 | 168
2023 | 168
2024 | 170
2025 | 176
2026 to 2030 | 791
Post retirement medical services [member] |
Disclosure of defined benefit plans [line items] |
2021 | 26
2022 | 28
2023 | 29
2024 | 31
2025 | 33
2026 to 2030 | $ 199

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- Definition Defined benefit plan expected future benefit payments in year five. + 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 Defined benefit plan expected future benefit payments year four. + 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 Defined benefit plan expected future benefit payments year six to ten. + 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 Defined benefit plan expected future benefit payments year three. + 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 Defined benefit plan expected future benefit payments year two. + 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 Defined benefit plan expected future benefit payments next twelve months. + 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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Data Type: | xbrli:stringItemType
Balance Type: | na
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
Name: | ifrs-full_DefinedBenefitPlansAxis=fmx_SeniorityPremiumsMember
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: |