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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, 2018	Dec. 31, 2017
Disclosure of Restricted Cash and Cash Equivalents [line items]
Current restricted cash	$ 101	$ 504
Brazilian reais [member]
Disclosure of Restricted Cash and Cash Equivalents [line items]
Current restricted cash	98	65
Colombian pesos [member]
Disclosure of Restricted Cash and Cash Equivalents [line items]
Current restricted cash		$ 439
Chilean pesos [member]
Disclosure of Restricted Cash and Cash Equivalents [line items]
Current restricted cash	$ 3

X

- Definition

Current restricted cash.

+ References

No definition available.

+ Details

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

X

- 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:	srt_CurrencyAxis=fmx_BrazilianReaisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=fmx_ColombianPesosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=fmx_ChileanPesosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: