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Employee Benefits - Summary of Defined Benefit Plan Expected Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2018 MXN ($)
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Disclosure of defined benefit plans [line items] |
2019 | $ 753
2020 | 434
2021 | 371
2022 | 366
2023 | 423
2024 to 2028 | 2,422
Pension and retirement plans [member] |
Disclosure of defined benefit plans [line items] |
2019 | 630
2020 | 340
2021 | 284
2022 | 286
2023 | 345
2024 to 2028 | 2,000
Seniority premiums [member] |
Disclosure of defined benefit plans [line items] |
2019 | 101
2020 | 71
2021 | 63
2022 | 56
2023 | 53
2024 to 2028 | 257
Post retirement medical services [member] |
Disclosure of defined benefit plans [line items] |
2019 | 22
2020 | 23
2021 | 24
2022 | 24
2023 | 25
2024 to 2028 | $ 165

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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
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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: |