XML 110 R72.htm IDEA: XBRL DOCUMENT
v3.20.1

Significant Accounting Policies - Disclosure of Recognition of Effects of Inflation in Countries with Hyperinflationary Economic Environments (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
2016- 2018 [member] | Mexico [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 15.70% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Guatemala [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 12.20% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Costa Rica [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 5.70% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Panama [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 2.10% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Colombia [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 13.40% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Nicaragua [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 13.10% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Argentina [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 158.40% |
Type of Economy |  | Hyperinflationary |
2016- 2018 [member] | Brazil [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 25.00% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Philippines [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 11.90% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Euro Zone [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 2.70% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Chile [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 9.70% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Peru [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 9.30% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Ecuador [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 30.30% |
Type of Economy |  | Non-hyperinflationary |
2016- 2018 [member] | Uruguay [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  | 25.30% |
Type of Economy |  | Non-hyperinflationary |
2015 - 2017 [member] | Mexico [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 12.70%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Guatemala [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 13.50%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Costa Rica [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 2.50%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Panama [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 2.30%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Colombia [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 17.50%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Nicaragua [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 12.30%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Argentina [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 101.50%
Type of Economy |  |  | Hyperinflationary
2015 - 2017 [member] | Venezuela [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 30690.00%
Type of Economy |  |  | Hyperinflationary
2015 - 2017 [member] | Brazil [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 21.10%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Philippines [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 7.50%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Euro Zone [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 2.70%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Chile [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 9.70%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Peru [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 9.30%
Type of Economy |  |  | Non-hyperinflationary
2015 - 2017 [member] | Ecuador [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation |  |  | 30.30%
Type of Economy |  |  | Non-hyperinflationary
2017-2019 [member] | Mexico [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 13.20% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Guatemala [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 11.80% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Costa Rica [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 5.80% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Panama [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 0.50% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Colombia [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 11.00% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Nicaragua [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 15.60% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Argentina [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 179.40% |  |
Type of Economy | Hyperinflationary |  |
2017-2019 [member] | Brazil [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 11.10% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Euro Zone [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 3.60% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Chile [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 8.30% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Peru [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 5.20% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Ecuador [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 0.30% |  |
Type of Economy | Non-hyperinflationary |  |
2017-2019 [member] | Uruguay [member] |  |  |
Disclosure of Hyperinflationary Reporting [line items] |  |  |
Cumulative Inflation | 22.00% |  |
Type of Economy | Non-hyperinflationary |  |

X
- Definition Cumulative inflation percentage. + References No definition available. + Details
Name: | fmx_CumulativeInflationPercentage
Namespace Prefix: | fmx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description Of Type Of Economy + References No definition available. + Details
Name: | fmx_DescriptionOfTypeOfEconomy
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of hyperinflationary reporting. + References No definition available. + Details
Name: | fmx_DisclosureOfHyperinflationaryReportingLineItems
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CreationDateAxis=fmx_TwoThousandSixteenToTwoThousandEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_GT
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_PA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CO
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_NI
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_AR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_BR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_PH
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=fmx_EuroZoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_PE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_EC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_UY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=fmx_TwoThousandFifteenToTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_VE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=fmx_TwoThousandSeventeenToTwoThousandNineteenmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |