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Balances and Transactions with Related Parties and Affiliated Companies - Commitments with Related Parties (Parenthetical) (Detail) - Heineken [member]	12 Months Ended
	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Renewal option for supply contract	5 years
Restriction period from holding exclusive contract with another supplier at the end of the contract term	3 years

X

- Definition

Restriction period for related party transaction.

+ References

No definition available.

+ Details

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

X

- Definition

Term of renewal option for related party transaction.

+ References

No definition available.

+ Details

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

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_HeinekenGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: