XML 68 R179.htm IDEA: XBRL DOCUMENT
v3.20.1

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