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Other Liabilities, Provisions, Contingencies and Commitments - Additional Information (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of financial liabilities [line items] |  |  |
Aggregate amount claimed against company | $ 70,830 |  |
Rental expense | 9,468 | $ 8,202 | $ 6,088
Brazil [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Litigation amount | 9,433 | $ 8,093 | $ 3,569
Coca-Cola FEMSA [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Tax contingencies amount | 51,014 |  |
Coca-Cola FEMSA [member] | ICMS [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Tax contingencies amount | 12,346 |  |
Coca-Cola FEMSA [member] | Tax credits [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Tax contingencies amount | 33,217 |  |
Coca-Cola FEMSA [member] | Federal taxes [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Tax contingencies amount | 4,787 |  |
Coca-Cola FEMSA [member] | Value added tax [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Tax contingencies amount | 664 |  |
Heineken [member] | Unsettled [member] | Brazil [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Unsettled indirect tax contingencies | $ 6,272 |  |

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