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Subsequent Events - Schedule of Outstanding Shares Immediately After Stock Split (Detail) - shares | Jan. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of non-adjusting events after reporting period [line items] |  |  |
Outstanding shares |  | 17,891,131,350 | 17,891,131,350
Major ordinary share transactions after stock split [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Outstanding shares | 16,806,658,096 |  |
% of the capital stock | 100.00% |  |
% of ordinary shares with full voting rights | 100.00% |  |
Major ordinary share transactions after stock split [member] | Series A shares [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Shareholders | Wholly-owned subsidiary of Fomento Económico Mexicano, S.A.B. de C.V. |  |
Outstanding shares | 7,936,628,152 |  |
% of the capital stock | 47.223% |  |
% of ordinary shares with full voting rights | 55.968% |  |
Major ordinary share transactions after stock split [member] | Series D shares [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Shareholders | Wholly-owned subsidiaries of The Coca-Cola Company |  |
Outstanding shares | 4,668,365,424 |  |
% of the capital stock | 27.777% |  |
% of ordinary shares with full voting rights | 32.921% |  |
Major ordinary share transactions after stock split [member] | Series B shares [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Shareholders | Public float |  |
Outstanding shares | 1,575,624,195 |  |
% of the capital stock | 9.375% |  |
% of ordinary shares with full voting rights | 11.111% |  |
Major ordinary share transactions after stock split [member] | Series L share [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Shareholders | Public float |  |
Outstanding shares | 2,626,040,325 |  |
% of the capital stock | 15.625% |  |
% of ordinary shares with full voting rights | 0.00% |  |

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