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Other Current Assets and Other Current Financial Assets - Summary of Prepaid Expenses (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Prepaid Expense Current [abstract] |  |
Advances for inventories | $ 1,500 | $ 1,260
Advertising and promotional expenses paid in advance | 510 | 370
Advances to service suppliers | 236 | 268
Prepaid leases | 211 | 218
Prepaid insurance | 117 | 103
Others | 140 | 206
Current prepaid expenses | $ 2,714 | $ 2,425

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- Definition Advances for inventories. + References No definition available. + Details
Name: | fmx_AdvancesForInventories
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Advertising and promotional expenses paid in advance. + References No definition available. + Details
Name: | fmx_AdvertisingAndPromotionalExpensesPaidInAdvance
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of prepaid expense current. + References No definition available. + Details
Name: | fmx_DisclosureOfPrepaidExpenseCurrentAbstract
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other prepaid expenses. + References No definition available. + Details
Name: | fmx_OtherPrepaidExpenses
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Prepaid insurance 1. + References No definition available. + Details
Name: | fmx_PrepaidInsurance1
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Prepaid leases. + References No definition available. + Details
Name: | fmx_PrepaidLeases
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current advances made to suppliers before goods or services are received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount recognised as a current asset for expenditures made prior to the period when the economic benefit will be realised. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant