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Mergers, Acquisitions and Disposals - Additional Information (Detail) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 22, 2018 MXN ($) | Dec. 31, 2019 MXN ($) Employees | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Aug. 16, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Sale percentage of investment |  |  |  | 5.20% |
Proceeds from investment property |  |  |  | $ 53,051 |
Gain on sale of investment |  |  |  | 29,989 |
Gain is net of transaction related costs |  |  |  | 160 |
Other comprehensive income to consolidated net income |  |  |  | 6,632 |
Other comprehensive income to consolidated net income a total loss |  |  |  | $ 2,431 |
Increase in Goodwill |  | $ 0 |  |  |
Coca-Cola FEMSA [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of ownership interest of subsidiary |  | 47.20% | 47.20% |  |
CCFPI [member] | Written put options [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage of ownership interest |  |  |  |  | 51.00%
Cafe Del Pacifico SAPI De CV Caffenio [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired | 10.00% |  |  |  |
Business acquisition, consideration transferred | $ 370 |  |  |  |
Business acquisition, percentage of ownership interest of subsidiary | 50.00% |  |  |  |
Other acquisitions [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, consideration transferred |  | $ 7,671 |  |  |
Other acquisitions [member] | Coca-Cola FEMSA [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, consideration transferred |  |  | $ 6,552 |  |
Decrease in Non-Current Assets |  |  | 4,031 |  |
Increase in Goodwill |  |  | $ 2,903 |  |
Abasa [member] | Coca-Cola FEMSA [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |
Los Volcanes [member] | Coca-Cola FEMSA [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |
MONRESA [member] | Coca-Cola FEMSA [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |
Coca-Cola FEMSA [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Decrease in Non-Current Assets |  | $ 236 |  |  |
Increase in Goodwill |  | 2,903 |  |  |
Deferred tax liabilities recognised as of acquisition date |  | 0 |  |  |
Coca-Cola FEMSA [member] | Distribution rights [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Intangible assets recognised as of acquisition date |  | $ 2,887 |  |  |
GPF [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |
AGV [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |
Number of employees | Employees |  | 2,600 |  |  |

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