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Other Current Assets and Other Current Financial Assets - Prepaid Expenses (Details) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Prepaid Expense Current [abstract] |  |  |
Advances for inventories | $ 2,110 | $ 1,651 |
Advertising and promotional expenses paid in advance | 105 | 93 |
Advances to service suppliers | 81 | 30 |
Prepaid leases | 118 | 93 |
Prepaid insurance | 284 | 181 |
Others | 417 | 376 |
Current prepaid expenses | 3,115 | 2,424 |
Prepaid advertising and promotional expenses | $ 7,586 | $ 7,471 | $ 8,840

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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

X
- 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 expense arising from advertising. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_AdvertisingExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_CurrentAdvancesToSuppliers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant