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Other Current Assets and Other Current Financial Assets - Summary of Carrying of Restricted Cash Pledged (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Restricted Cash and Cash Equivalents [line items] |  |
Current restricted cash | $ 101 | $ 504
Brazilian reais [member] |  |
Disclosure of Restricted Cash and Cash Equivalents [line items] |  |
Current restricted cash | 98 | 65
Colombian pesos [member] |  |
Disclosure of Restricted Cash and Cash Equivalents [line items] |  |
Current restricted cash |  | $ 439
Chilean pesos [member] |  |
Disclosure of Restricted Cash and Cash Equivalents [line items] |  |
Current restricted cash | $ 3 |

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- Definition Current restricted cash. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of restricted cash and cash equivalents 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: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CurrencyAxis=fmx_ColombianPesosMember
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: |