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Employee Benefits - Summary of Defined Benefit Plan Expected Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2019 MXN ($)
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Disclosure of defined benefit plans [line items] |
2020 | $ 916
2021 | 464
2022 | 469
2023 | 542
2024 | 535
2025 to 2029 | 3,910
Pension and retirement plans [member] |
Disclosure of defined benefit plans [line items] |
2020 | 767
2021 | 332
2022 | 340
2023 | 414
2024 | 405
2025 to 2029 | 3,192
Seniority premiums [member] |
Disclosure of defined benefit plans [line items] |
2020 | 129
2021 | 111
2022 | 107
2023 | 106
2024 | 107
2025 to 2029 | 594
Post retirement medical services [member] |
Disclosure of defined benefit plans [line items] |
2020 | 20
2021 | 21
2022 | 22
2023 | 22
2024 | 23
2025 to 2029 | $ 124

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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
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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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- 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: |
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Balance Type: |
Period Type: |