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Other Current Assets and Other Current Financial Assets - Summary of Carrying of Restricted Cash Pledged (Detail) - MXN ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Restricted Cash and Cash Equivalents [Line Items]
Current restricted cash	$ 504	$ 774
Venezuelan Bolivars [member]
Disclosure of Restricted Cash and Cash Equivalents [Line Items]
Current restricted cash		183
Brazilian reais [member]
Disclosure of Restricted Cash and Cash Equivalents [Line Items]
Current restricted cash	65	73
Colombian pesos [member]
Disclosure of Restricted Cash and Cash Equivalents [Line Items]
Current restricted cash	$ 439	$ 518

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- Definition

Current restricted cash.

+ References

No definition available.

+ Details

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

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- 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:	us-gaap_CurrencyAxis=fmx_VenezuelanBolivarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CurrencyAxis=fmx_BrazilianReaisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CurrencyAxis=fmx_ColombianPesosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: