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Mergers, Acquisitions and Disposals - Summary of Selected Income Statement Information Related to Business Acquisition (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Vonpar [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Total revenues |  |  | $ 1,628
Income before income taxes |  |  | 380
Net income |  |  | 252
Other acquisitions [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Total revenues |  |  | 2,400
Income before income taxes |  |  | (66)
Net income |  |  | $ (80)
CCFPI [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Total revenues |  | $ 20,524 |
Income before income taxes |  | 1,265 |
Net income |  | $ 896 |
Coca-Cola FEMSA [member] | Other acquisitions [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Total revenues | $ 4,628 |  |
Income before income taxes | 496 |  |
Net income | $ 413 |  |

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