XML 202 R186.htm IDEA: XBRL DOCUMENT
v3.19.1

Other Liabilities, Provisions, Contingencies and Commitments - Changes in Balance of Provisions Recorded (Parenthetical) (Detail) - MXN ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial liabilities [line items] |  |
Indemnifiable assets | $ 3,336 | $ 4,510
Indirect taxes [member] |  |
Disclosure of financial liabilities [line items] |  |
Tax claims | 7,840 |
Deductibility of a tax goodwill | 5,321 |
Contingencies guaranteed agreements | 8,081 |
Indemnifiable assets | $ 1,874 |

X
- Definition Contingencies guaranteed agreements value + References No definition available. + Details
Name: | fmx_ContingenciesGuaranteedAgreementsValue
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indemnifiable assets from business combination. + References No definition available. + Details
Name: | fmx_IndemnifiableAssetsFromBusinessCombination
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Taxes payable due in tax claims. + References No definition available. + Details
Name: | fmx_TaxesPayableDueInTaxClaims
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DisclosureOfFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of goodwill in a business combination that is expected to be deductible for tax purposes. [Refer: Goodwill; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_k&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_GoodwillExpectedDeductibleForTaxPurposes
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=fmx_IndirectTaxesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |