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Other Current Assets and Other Financial Assets - Additional Information (Detail) - MXN ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of carrying amount and value in use of investments in associates and joint ventures [abstract] |  |  |
Prepaid advertising and promotional expenses | $ 8,840 | $ 7,695 | $ 6,148

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- Definition Disclosure of carrying amount and value in use of investments in associates and joint ventures. + 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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- Definition Prepaid advertising and promotional expenses. + References No definition available. + Details
Name: | fmx_PrepaidAdvertisingAndPromotionalExpenses
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant