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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Transaction with Related Parties (Parenthetical) (Detail) - MXN ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
The Coca-Cola company [member]
Disclosure of transactions between related parties [line items]
Contributions	$ 4,023	$ 4,518	$ 3,749

X

- Definition

Contributions due from related parties.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fmx_CocaColaCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: