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Intangible Assets - Amortization (Details) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Allocation Of Amortisation Expenses [abstract]
Cost of goods sold	$ 49	$ 1,229	$ 207
Administrative expenses	649	1,257	1,771
Selling expenses	1,919	809	718
Amortization expense	$ 2,617	$ 3,295	$ 2,696

X

- Definition

Amortisation expense reported in administrative expenses.

+ References

No definition available.

+ Details

Name:	fmx_AmortizationExpenseReportedInAdministrativeExpenses
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortisation expense reported in cost of goods sold.

+ References

No definition available.

+ Details

Name:	fmx_AmortizationExpenseReportedInCostOfGoodsSold
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortisation expense reported in selling expenses.

+ References

No definition available.

+ Details

Name:	fmx_AmortizationExpenseReportedInSellingExpenses
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Abstract of allocation of amortisation expenses.

+ References

No definition available.

+ Details

Name:	fmx_DisclosureOfAllocationOfAmortizationExpensesAbstract
Namespace Prefix:	fmx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration