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Company Business - Significant Investments in Subsidiaries (Detail) - shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 13, 2019 | Jan. 31, 2019 | Apr. 30, 2010 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  | 14.80% | 14.80% |
Stock Split Ratio |  | 8 |  |  |  |
Series B shares [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Stock Split Ratio |  | 3 |  |  |  |
Series L shares [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Stock Split Ratio |  | 5 |  |  |  |
Heineken Group |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 20.00% | 14.76% | 14.76% |
Coca-Cola FEMSA [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  | 47.20% | 47.20% |
Percentage of voting share in subsidiary |  |  |  | 56.00% | 63.00% |
Percentage Of Shares Traded As American Depositary Shares |  |  |  | 25.00% |  |
Coca-Cola FEMSA [member] | The Coca-Cola Company [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  | 27.80% |  |
FEMSA Comercio - Proximity Division [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  | 100.00% | 100.00% |
FEMSA Comercio - Fuel Division [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  | 100.00% | 100.00% |
FEMSA Comercio - Health Division [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  | 100.00% |  |
Other businesses [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  |  | 100.00% |
Farmacias Yza [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary |  |  |  | 18.60% |  |
Grupo Socofar [member] |  |  |  |  |  |
Disclosure Of Parent Entity Information [line items] |  |  |  |  |  |
Percentage of ownership in subsidiary | 40.00% |  |  | 100.00% |  | 60.00%

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