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Activities of the Company - Summary of Significant Investments in Subsidiaries (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Parent Entity Information [Line Items] |  |
Country of incorporation | Mexico |
Coca-Cola FEMSA [member] |  |
Disclosure Of Parent Entity Information [Line Items] |  |
Percent of ownership interest | 47.20% | 47.90%
Percent of shares as ADS | 25.00% |
Farmacias Yza [member] |  |
Disclosure Of Parent Entity Information [Line Items] |  |
Percent of ownership interest | 23.00% |
Grupo Socofar [member] |  |
Disclosure Of Parent Entity Information [Line Items] |  |
Percent of ownership interest | 60.00% |
The Coca-Cola company [member] | Coca-Cola FEMSA [member] |  |
Disclosure Of Parent Entity Information [Line Items] |  |
Percent of ownership interest | 27.80% |
Heineken investment [member] | Heineken Company [member] |  |
Disclosure Of Parent Entity Information [Line Items] |  |
Percent of ownership interest | 14.80% | 20.00%
Heineken investment [member] | Heineken Holding N.V. [member] |  |
Disclosure Of Parent Entity Information [Line Items] |  |
Percent of ownership interest | 14.80% | 20.00%

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