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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, 2017 | Dec. 31, 2016
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Disclosure of Restricted Cash and Cash Equivalents [Line Items] |  |
Current restricted cash | $ 504 | $ 774
Venezuelan Bolivars [member] |  |
Disclosure of Restricted Cash and Cash Equivalents [Line Items] |  |
Current restricted cash |  | 183
Brazilian reais [member] |  |
Disclosure of Restricted Cash and Cash Equivalents [Line Items] |  |
Current restricted cash | 65 | 73
Colombian pesos [member] |  |
Disclosure of Restricted Cash and Cash Equivalents [Line Items] |  |
Current restricted cash | $ 439 | $ 518

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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
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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: |