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Other Current Assets and Other Current Financial Assets - Restricted Cash Pledged (Details) - MXN ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Other Current Assets and Other Current Financial Assets
Restricted cash	$ 349	$ 304
U.S. dollars
Other Current Assets and Other Current Financial Assets
Restricted cash	$ 349	$ 304

X

- Definition

Current restricted cash.

+ References

No definition available.

+ Details

Name:	fmx_CurrentRestrictedCash
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of restricted cash and cash equivalents line items.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: