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Taxes - Narrative (Details) $ in Millions	1 Months Ended
	Dec. 31, 2024 MXN ($)
Disclosure of income taxes [Line Items]
Gains (losses) on disposal of subsidiary	$ 282

X

- Definition

Line items represent concepts included in income taxes.

+ References

No definition available.

+ Details

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

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- Definition

Gains (Losses) On Disposal Of Subsidiary

+ References

No definition available.

+ Details

Name:	fmx_GainsLossesOnDisposalOfSubsidiary
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration