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Material Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details) - MXN ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Material Accounting Policies [Abstract]
Short-term deposits, classified as cash equivalents	$ 3,971	$ 2,315

X

- Definition

Significant Accounting Policies [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant