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Financial Instruments - Net Effects of Expired Contracts That Met Hedging Criteria (Details) - Derivative Contract Met Hedging Criteria - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Currency swap contract | Interest expense |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | $ 0 | $ (392) | $ (1)
Currency swap contract | Foreign exchange |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | 0 | (747) | (5)
Interest rate swaps | Interest expense |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | 0 | 0 | 0
Forward contract | Foreign exchange |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | (3) | 180 | 565
Forward contract | Cost of goods sold |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | 136 | (1,834) | (681)
Commodity price contracts | Cost of goods sold |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | (15) | 430 | 614
Options to purchase foreign currency | Cost of goods sold |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net effects of expired contracts | $ 39 | $ 0 | $ 0

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- Definition The gain (loss) attributable to expired derivative contracts recognized in profit or loss during the period. + References No definition available. + Details
Name: | fmx_GainLossOnExpiredDerivativeContractsRecognizedInProfitOrLoss
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=fmx_DerivativeContractMetHedgingCriteriaMember
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Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_HedgingInstrumentsAxis=ifrs-full_CurrencySwapContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fmx_IfrsIncomeStatementLocationAxis=fmx_IfrsInterestExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fmx_IfrsIncomeStatementLocationAxis=fmx_InterestIncomeForeignExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_HedgingInstrumentsAxis=ifrs-full_InterestRateSwapContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_HedgingInstrumentsAxis=ifrs-full_ForwardContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fmx_IfrsIncomeStatementLocationAxis=fmx_IfrsCostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_HedgingInstrumentsAxis=fmx_CommodityPriceContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_HedgingInstrumentsAxis=ifrs-full_OptionContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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