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Other Liabilities, Provisions, Contingencies and Commitments - Additional Information (Detail) - MXN ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Disclosure of financial liabilities [line items] |  |  |  |
Aggregate amount claimed against company |  |  |  | $ 81,683
Capital Commitments | $ 556 |  |  |
Brazil [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Tax contingencies amount | 53,937 |  |  |
Litigation amount | 10,471 | $ 7,739 | $ 9,433 |
Coca-Cola FEMSA [member] | ICMS [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Tax contingencies amount | 10,378 |  |  |
Coca-Cola FEMSA [member] | Tax credits [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Tax contingencies amount | 34,102 |  |  |
Coca-Cola FEMSA [member] | Federal taxes [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Tax contingencies amount | 6,274 |  |  |
Coca-Cola FEMSA [member] | Value added tax [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Tax contingencies amount | $ 3,183 |  |  |

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