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Other Current Assets and Other Current Financial Assets - Other Current Assets (Detail) - MXN ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Other Current Assets [abstract]
Prepaid expenses	$ 2,424	$ 2,201
Recoverable taxes	5	268
Agreements with customers	115	294
Licenses	261	575
Assets classified as held for sale	30	197
Other	84	553
Other current assets	$ 2,919	$ 4,088

X

- Definition

Agreement with customers.

+ References

No definition available.

+ Details

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

X

- Definition

Current recoverable taxes.

+ References

No definition available.

+ Details

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X

- Definition

Disclosure Of Other Current Assets [abstract]

+ References

No definition available.

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- Definition

Licenses

+ References

No definition available.

+ Details

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

X

- Definition

Other current assets other.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount recognised as a current asset for expenditures made prior to the period when the economic benefit will be realised.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	debit
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X

- Definition

The amount of non-current assets or disposal groups classified as held for sale. [Refer: Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2020-01-01
-Paragraph 38
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_38&doctype=Standard
-URIDate 2020-01-01

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- Definition

The amount of current assets that the entity does not separately disclose in the same statement or note. [Refer: Current assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

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