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Significant Accounting Policies - Additional Information (Detail) € in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2017 | Apr. 30, 2017 | Jan. 01, 2017 | Nov. 30, 2016 | Sep. 30, 2017 USD ($) | Dec. 31, 2017 MXN ($) $ / $ Bs. / $ yr Age Agreement | Dec. 31, 2017 USD ($) yr Age Agreement | Dec. 31, 2017 EUR (€) yr Age Agreement | Dec. 31, 2016 MXN ($) Bs. / $ | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 MXN ($) | Dec. 31, 2015 EUR (€) | Apr. 20, 2018 $ / $ | Jan. 30, 2018 Bs. / $ | Dec. 31, 2017 USD ($) $ / $ Bs. / $ | Dec. 31, 2017 EUR (€) $ / $ Bs. / $ | Dec. 31, 2016 USD ($) Bs. / $ | Dec. 31, 2016 EUR (€) Bs. / $
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill recognized |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale percentage of investment |  |  |  |  |  | 5.20% | 5.20% |  | 5.20% |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income to consolidated net income |  |  |  |  |  | $ 6,632,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expenses amount |  |  |  |  |  | 33,958,000,000 |  |  |  | $ 5,909,000,000 |  | $ 2,741,000,000 |  |  |  |  |  |  |  |
Foreign currency translation losses |  |  |  |  |  | 14,482,000,000 | $ 737 | [1] |  | 30,763,000,000 |  | (2,234,000,000) |  |  |  |  |  |  |  |
Net sale |  |  |  |  |  | 459,763,000,000 | 23,410 | [1] |  | 398,622,000,000 |  | 310,849,000,000 |  |  |  |  |  |  |  |
Losses |  |  |  |  |  | 37,206,000,000 | $ 1,895 | [1] |  | 27,175,000,000 |  | 23,276,000,000 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | 588,541,000,000 |  |  |  | 545,623,000,000 |  | 409,332,000,000 |  |  |  | $ 29,967 | [1] |  |  |
Liabilities |  |  |  |  |  | $ 251,629,000,000 |  |  |  | 259,453,000,000 |  | 167,476,000,000 |  |  |  | $ 12,812 | [1] |  |  |
Exchange rate | $ / $ |  |  |  |  |  | 19.6395 |  |  |  |  |  |  |  |  |  | 19.6395 |  | 19.6395 |  |
Recognized interest income on loans and receivables |  |  |  |  |  |  |  |  |  | 41,000,000 |  | 53,000,000 |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  | $ 1,259,000,000 |  |  |  | 1,016,000,000 |  | 604,000,000 |  |  |  |  |  |  |  |
Automatic renewable term |  |  |  |  |  | 10 years | 10 years |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Impairment recognized |  |  |  |  |  | $ 2,063,000,000 |  |  |  |  |  | 134,000,000 |  |  |  |  |  |  |  |
Gain or loss recognized in profit or loss |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum year of service for retirement benefits | yr |  |  |  |  |  | 10 | 10 |  | 10 |  |  |  |  |  |  |  |  |  |  |
Minimum age for retirement benefits | Age |  |  |  |  |  | 60 | 60 |  | 60 |  |  |  |  |  |  |  |  |  |  |
Minimum wages or salary for service |  |  |  |  |  | 12 days | 12 days |  | 12 days |  |  |  |  |  |  |  |  |  |  |
Maximum wages or salary for service |  |  |  |  |  | 15 years | 15 years |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Distribution costs |  |  |  |  |  | $ 25,041,000,000 |  |  |  | $ 20,250,000,000 |  | $ 20,205,000,000 |  |  |  |  |  |  |  |
Profit sharing computation ratio on income |  |  |  |  |  | 10.00% | 10.00% |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Income tax rate | 8.00% |  |  |  |  | 30.00% | 30.00% |  | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% |  |  |  |  |  |  |
Bottom of range [member] | Information technology and management system costs [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 3 years | 3 years |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Bottom of range [member] | Long-term alcohol licenses [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 12 years | 12 years |  | 12 years |  |  |  |  |  |  |  |  |  |  |
Top of range [member] | Information technology and management system costs [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 10 years | 10 years |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Top of range [member] | Long-term alcohol licenses [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 15 years | 15 years |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Coeficiente de Estabilizacion de Referencia [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative inflation percentage |  | 95.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Inflation Period |  | Three-year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WPI [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative inflation percentage |  |  |  | 92.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Inflation Period |  |  |  | Three years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in foreign exchange rates [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate | $ / $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.6145 |  |  |  |  |  |
Heineken [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill recognized |  |  |  |  |  | $ 20,761,000,000 |  |  |  | $ 26,116,000,000 |  |  |  |  |  |  |  | € 881 |  | € 1,200
Sale percentage of investment |  |  |  |  | 5.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income to consolidated net income |  |  |  |  | $ 6,632 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  | 7,656,000,000 |  |  | € 357 | 6,430,000,000 | € 308 | $ 6,567,000,000 | € 378 |  |  |  |  |  |  |
Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  | $ 759,000,000 |  |  |  | $ 582,000,000 |  | $ 317,000,000 |  |  |  |  |  |  |  |
Coca-Cola FEMSA [member] | PET bottles [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 1.5 years | 1.5 years |  | 1.5 years |  |  |  |  |  |  |  |  |  |  |
Coca-Cola FEMSA [member] | Glass bottles [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  | 3 years | 3 years |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Coca-Cola FEMSA [member] | Changes in foreign exchange rates [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate | Bs. / $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |
Coca-Cola FEMSA [member] | DIPRO [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded using exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 629 |
Exchange rate | Bs. / $ |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  | 10 | 10
Coca-Cola FEMSA [member] | DICOM [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded using exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 104 |
Exchange rate | Bs. / $ |  |  |  |  |  | 22,793 |  |  |  | 673.76 |  |  |  |  |  | 22,793 |  | 22,793 | 673.76 | 673.76
Description of identity of price index |  |  |  |  |  |  |  |  |  | Coca-Cola FEMSA has U.S. $104 million recorded at DICOM (Divisas Complementarias) exchange rate at 673.76 bolivars per U.S. dollar. | Coca-Cola FEMSA has U.S. $104 million recorded at DICOM (Divisas Complementarias) exchange rate at 673.76 bolivars per U.S. dollar. |  |  |  |  |  |  |  |  |
Venezuela [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative inflation percentage |  |  |  |  |  | 100.00% | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Cumulative inflation period |  |  |  |  |  | Three preceding years | Three preceding years |  | Three preceding years |  |  |  |  |  |  |  |  |  |  |
Impairment recognized |  |  |  |  |  | $ 2,053,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Venezuela [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expenses amount |  |  |  |  |  | 28,177,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense reclassification |  |  |  |  |  | 26,123,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation losses |  |  |  |  |  | 745,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  | 1,098,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution rights |  |  |  |  |  | 210,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sale |  |  |  |  |  | 4,005,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses |  |  |  |  |  | 2,223,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | 4,138,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  | $ 2,889,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Impairment recognized |  |  |  |  |  | $ 745,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mexico [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax rate |  |  |  |  |  | 30.00% | 30.00% |  | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% |  |  |  |  |  |  |
Mexico [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 10 | 10 |  | 10 |  |  |  |  |  |  |  |  |  |  |
Brazil [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 9 | 9 |  | 9 |  |  |  |  |  |  |  |  |  |  |
Argentina [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax rate |  |  |  |  |  | 35.00% | 35.00% |  | 35.00% |  |  |  |  |  |  |  |  |  |  |
Argentina [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Colombia [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax rate |  |  | 9.00% |  |  |  |  |  |  |  |  | 9.00% | 9.00% |  |  |  |  |  |  |
Colombia [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax rate |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |
Colombia [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Guatemala [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Costa Rica [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Nicaragua [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Panama [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Philippines [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bottler agreements | Agreement |  |  |  |  |  | 1 | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

X
- Definition Business acquisition sale of equity interest percentage. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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 Cumulative inflation period. + References No definition available. + Details
Name: | fmx_CumulativeInflationPeriod
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of significant accounting policies. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effect of cumulative inflation percentage recognised. + References No definition available. + Details
Name: | fmx_EffectOfCumulativeInflationPercentageRecognised
Namespace Prefix: | fmx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effect of cumulative inflation recognition period. + References No definition available. + Details
Name: | fmx_EffectOfCumulativeInflationRecognitionPeriod
Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Foreign exchange liabilities. + References No definition available. + Details
Name: | fmx_ForeignExchangeLiabilities
Namespace Prefix: | fmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Intangible assets renewable term. + References No definition available. + Details
Name: | fmx_IntangibleAssetsRenewableTerm
Namespace Prefix: | fmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum wages or service for service. + References No definition available. + Details
Name: | fmx_MaximumWagesOrServiceForService
Namespace Prefix: | fmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum age for retirement benefits. + References No definition available. + Details
Name: | fmx_MinimumAgeForRetirementBenefits
Namespace Prefix: | fmx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum wages or service for service. + References No definition available. + Details
Name: | fmx_MinimumWagesOrServiceForService
Namespace Prefix: | fmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
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