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Taxes - Schedule of Deferred Income Tax (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2019
Disclosure of income taxes [Line Items]
Deferred tax recovery period	10 years

X

- Definition

Deferred tax recovery period.

+ References

No definition available.

+ Details

Name:	fmx_DeferredTaxRecoveryPeriod
Namespace Prefix:	fmx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent concepts included in income taxes.

+ References

No definition available.

+ Details

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