Additional tax for the contribution of poverty eradication fund.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Capitalization ratio.

+ References

No definition available.

+ Details

Name:	fmx_CapitalizationRatio
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in income taxes.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Dividend Rate

+ References

No definition available.

+ Details

Name:	fmx_DividendRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum assumed income tax rate.

+ References

No definition available.

+ Details

Name:	fmx_MinimumAssumedIncomeTaxRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Net operating loss usage limit.

+ References

No definition available.

+ Details

Name:	fmx_NetOperatingLossUsageLimit
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of average federal production and federal sales tax over net sales.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfAverageFederalProductionAndFederalSalesTaxOverNetSales
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Capital GainTax Rate

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfCapitalGainTaxRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of contribution to poverty eradication.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfContributionToPovertyEradication
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of contribution to poverty eradication charged on sales.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfContributionToPovertyEradicationChargedOnSales
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of dividend received from Colombian non residents withholding.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of dividend received from Colombian residents withholding.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfDividendReceivedFromColombianResidentsWithholding
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of income tax rate.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfIncomeTaxRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of increase in Excise tax rate

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of increase in income tax rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of increase in value added tax rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of reduction in Excise tax rate

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfReductionInExciseTaxRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of reform extra income tax rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of reform income tax rate.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfReformIncomeTaxRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of special increase in income tax rate.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfSpecialIncreaseInIncomeTaxRate
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of tax rate that exceeds EBITDA

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfTaxRateThatExceedsEBITDA
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of withholding taxes on compensations of employees

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfWithholdingTaxesOnCompensationsOfEmployees
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of withholding taxes on salaries of employees.

+ References

No definition available.

+ Details

Name:	fmx_PercentageOfWithholdingTaxesOnSalariesOfEmployees
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Remaning percentage of value added tax.

+ References

No definition available.

+ Details

Name:	fmx_RemaningPercentageOfValueAddedTax
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Value added tax percentage.

+ References

No definition available.

+ Details

Name:	fmx_ValueAddedTaxPercentage
Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Withholding taxes associated with payment of dividends.

+ References

No definition available.

+ Details

Name:	fmx_WithholdingTaxesAssociatedWithPaymentOfDividends
Namespace Prefix:	fmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from revenue that is exempt from taxation. [Refer: Average effective tax rate; Applicable tax rate]

+ References

+ Details

Name:	ifrs-full_TaxRateEffectOfRevenuesExemptFromTaxation
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_f&doctype=Standard
-URIDate 2018-03-16

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fmx_CocaColaFomentoEconomicoMexicanoSabdeCvMember
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- Details

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Balance Type:
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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Data Type:	na
Balance Type:
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- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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- Details

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Income Taxes - Additional Information (Detail) - MXN ($)									12 Months Ended
	Jan. 01, 2020	Jul. 01, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 01, 2018	Oct. 19, 2017	Jan. 01, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of income taxes [Line Items]
Income tax rate							8.00%						30.00%	30.00%	30.00%
NOLs usage limit													30.00%
Withholding taxes associated with payment of dividends													$ 0	$ 0	$ 0
Temporary differences associated with investments					$ 45,305,000,000								$ 45,305,000,000	$ 41,915,000,000	$ 41,204,000,000
Coca Cola FEMSA [member]
Disclosure of income taxes [Line Items]
Percentage of average federal production and federal sales tax													16.50%
Mato Grosso do Sul [member] \| Bottom of range [member]
Disclosure of income taxes [Line Items]
Value-added tax															17.00%
Mato Grosso do Sul [member] \| Top of range [member]
Disclosure of income taxes [Line Items]
Value-added tax															20.00%
Rio Grande do Sul [member] \| Bottom of range [member]
Disclosure of income taxes [Line Items]
Value-added tax															18.00%
Rio Grande do Sul [member] \| Top of range [member]
Disclosure of income taxes [Line Items]
Value-added tax															20.00%
Minas Gerais [member]
Disclosure of income taxes [Line Items]
Remaining percentage of value added tax															18.00%
Additional Contribution to poverty eradication															2.00%
Rio de Janeiro [member] \| Bottom of range [member]
Disclosure of income taxes [Line Items]
Percentage of contribution to poverty eradication															1.00%
Rio de Janeiro [member] \| Top of range [member]
Disclosure of income taxes [Line Items]
Percentage of contribution to poverty eradication															2.00%
Parana [member]
Disclosure of income taxes [Line Items]
Percentage of contribution to poverty eradication															16.00%
Percentage of contribution to poverty eradication charged on sales to non-taxpayers															2.00%
Argentina [member] \| 1-4 months [member]
Disclosure of income taxes [Line Items]
Percentage of reduction in excise tax					4.00%	20.00%
Colombia [member]
Disclosure of income taxes [Line Items]
Income tax rate													33.00%
Minimum assumed income tax rate													3.50%
Capitalization ratio					33.33%								33.33%
New tax on dividends paid to non-resident stockholders and resident individuals					7.50%								7.50%	5.00%
Value-added tax															16.00%
Income tax rate								9.00%					9.00%	8.00%	6.00%	5.00%
Percentage of reform extra income tax rate													4.00%	6.00%
Percentage of dividend received from Columbian residents withholding														10.00%
Percentage of dividend received from colombian non residents withholding														5.00%
Percentage of increase in income tax rate														3.50%	3.00%
Percentage of Increase in value-added tax rate														19.00%
Colombia [member] \| Less than 1 year [member]
Disclosure of income taxes [Line Items]
Income tax rate													32.00%
Colombia [member] \| Later than one year [member]
Disclosure of income taxes [Line Items]
Income tax rate								33.00%					31.00%
Colombia [member] \| Later than two year [member]
Disclosure of income taxes [Line Items]
Percentage of reform income tax rate													30.00%
Colombia [member] \| Bottom of range [member]
Disclosure of income taxes [Line Items]
Percentage of special increase in income tax rate														15.00%
Colombia [member] \| Bottom of range [member] \| Less than 1 year [member]
Disclosure of income taxes [Line Items]
Income tax rate								34.00%
Colombia [member] \| Top of range [member]
Disclosure of income taxes [Line Items]
Percentage of reform income tax rate								35.00%
Percentage of special increase in income tax rate														20.00%
Changes in tax rates or tax laws enacted or announced [member] \| Argentina [member]
Disclosure of income taxes [Line Items]
New tax on dividends paid to non-resident stockholders and resident individuals					7.00%						13.00%	7.00%	7.00%
Income tax rate											25.00%	30.00%	35.00%
Percentage of reduction in excise tax	4.00%
Changes in tax rates or tax laws enacted or announced [member] \| Argentina [member] \| Sales taxes in the province of Buenos Aires [member]
Disclosure of income taxes [Line Items]
Income tax rate													1.50%	1.75%
Changes in tax rates or tax laws enacted or announced [member] \| Argentina [member] \| Sales Tax in City of Buenos Aires [member]
Disclosure of income taxes [Line Items]
Income tax rate									0.00%	0.50%	1.00%	1.50%	2.00%	1.00%
Changes in tax rates or tax laws enacted or announced [member] \| Argentina [member] \| 1-6 months [member]
Disclosure of income taxes [Line Items]
Percentage of reduction in excise tax	8.00%	12.00%
Percentage of increase in excise tax			12.00%	4.00%
Changes in tax rates or tax laws enacted or announced [member] \| Colombia [member]
Disclosure of income taxes [Line Items]
Minimum assumed income tax rate										0.00%	1.50%	1.50%
Capitalization ratio												50.00%
Municipality sales tax credited against payable income tax											100.00%	50.00%
Changes in tax rates or tax laws enacted or announced [member] \| Costa Rica [member]
Disclosure of income taxes [Line Items]
Value-added tax				13.00%
Percentage of capital gains				15.00%
Percentage of withholding taxes on salaries of employees				25.00%
Percentage of withholding taxes on compensations of employees				20.00%
Percentage of tax rate that exceeds EBITDA				20.00%