XML 182 R162.htm IDEA: XBRL DOCUMENT
v3.21.1

Taxes - Tax loss carryforwards, maturity (Details) - MXN ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | $ 26,618 | $ 32,536 | $ 29,941
Adjustments in deferred income tax assets | $ 3,847 |  |
NOLs usage limit | 30.00% |  |
0-1 year [member] |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | $ 35 |  |
Second 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 50 |  |
Third 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 26 |  |
Fourth 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 69 |  |
Fifth 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 872 |  |
Sixth 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 1,884 |  |
Seventh 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 52 |  |
Eighth 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 2,683 |  |
Ninth 12 months |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 3,535 |  |
Tenth 12 months and thereafter |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | 2,303 |  |
No expiration |  |  |
Disclosure of income taxes [Line Items] |  |  |
Unused tax losses for which no deferred tax asset recognised | $ 15,109 |  |

X
- Definition The amount of adjustments in deferred income tax assets during the period. + References No definition available. + Details
Name: | fmx_AdjustmentInDeferredIncomeTaxAssets
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent concepts included in income taxes. + References No definition available. + Details
Name: | fmx_DisclosureOfIncomeTaxesLineItems
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=fmx_LaterThanFiveYearsAndNotLaterThanSixYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=fmx_LaterThanSixYearsAndNotLaterThanSevenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=fmx_LaterThanSevenYearsAndNotLaterThanEightYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=fmx_LaterThanEightYearsAndNotLaterThanNineYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=fmx_LaterThanNineYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=fmx_IndefiniteTimeBandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |