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Mergers, Acquisitions and Disposals - Additional Information (Detail) - MXN ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 22, 2018 | Dec. 31, 2018 | Jun. 30, 2019 | Aug. 16, 2018
Coca-Cola FEMSA [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisition, cash paid |  |  | $ 3,576 |
Business acquisition, percentage of voting equity interests acquired |  |  | 100.00% |
CCFPI [member] | Written put options [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of ownership interest |  |  |  | 51.00%
Abasa [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |
Los Volcanes [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |
MONRESA [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |
Caffenio [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisition, percentage of voting equity interests acquired | 10.00% |  |  |
Business acquisition, percentage of ownership interest of subsidiary | 50.00% |  |  |

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