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Mergers, Acquisitions and Disposals - Summary of Selected Income Statement Information Related to Business Acquisition (Detail) - Other acquisitions [member] - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about business combination [line items] |  |
Total revenues | $ 8,594 |
Income before income taxes | 37 |
Net income (loss) | $ (1) |
Coca-Cola FEMSA [member] |  |
Disclosure of detailed information about business combination [line items] |  |
Total revenues |  | $ 4,628
Income before income taxes |  | 496
Net income (loss) |  | $ 413

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