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Financial Instruments - Sensitivity Analysis of Interest Rate Risks (Details) - Interest rate risk - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Interest rate swaps | FEMSA Entity Excluding Coca-Cola FEMSA |  |  |
Disclosure of Interest Rate Risk Exposure [line items] |  |  |
Effect on Equity | $ (148) | $ (9) | $ (90)
Unhedged Portion Bank Loans |  |  |
Disclosure of Interest Rate Risk Exposure [line items] |  |  |
Effect on profit loss | $ (258) | $ (250) | $ (249)

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- Definition Change in basis point effect on equity. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Change in interest rate effect on profit loss. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of interest rate risk exposure line items. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
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
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Namespace Prefix: |
Data Type: | na
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |