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Mergers, Acquisitions and Disposals - Additional Information (Detail) $ / shares in Units, shares in Millions, R$ in Millions, $ in Millions, $ in Millions |  |  | 12 Months Ended |  |  |  |  |
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May 22, 2018 MXN ($) | Dec. 06, 2016 MXN ($) shares $ / shares | Dec. 06, 2016 BRL (R$) | Dec. 31, 2018 MXN ($) $ / shares | Dec. 31, 2017 MXN ($) $ / shares | Dec. 31, 2016 MXN ($) Stores Distribution_Center | Aug. 16, 2018 | May 04, 2017 USD ($) | Dec. 06, 2016 BRL (R$) shares | Jan. 02, 2016 MXN ($) | Jan. 25, 2013
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Implicit share value per share | $ / shares |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
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 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  | 51.00% |  |  |  |  |  | 51.00%
Other comprehensive income translation adjustments |  |  |  |  | $ 2,996 |  |  |  |  |  |
Net assets for an amount |  |  |  |  | 22,597 |  |  |  |  |  |
CCFPI [member] | Purchased call options [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  |  |  | 49.00%
CCFPI [member] | Written put options [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  | 51.00% |  |  |  |
Vonpar [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash paid |  | $ 10,370 |  |  | 13,198 |  |  |  | R$ 1,730 |  |
Business acquisition, percentage of voting equity interests acquired |  | 100.00% |  |  |  |  |  | 100.00% | 100.00% |  |
Name of acquire |  |  |  | Vonpar S.A. |  |  |  |  |  |  |
Date of acquisition |  | Dec. 06, 2016 | Dec. 06, 2016 |  |  |  |  |  |  |  |
Business acquisition, consideration transferred |  | $ 20,992 |  |  | 20,992 |  |  |  | R$ 3,508 |  |
Business acquisition, additionally cash paid |  | 4,124 | R$ 688 |  |  |  |  |  |  |  |
Business acquisition, capitalized amount |  | 4,082 |  |  |  |  |  |  |  |  |
Net assets for an amount |  |  |  |  | 18,819 |  |  | $ 4,082 |  |  |
Equity interests of acquirer |  |  |  |  | $ 485 |  |  |  |  |  |
Transaction related costs expensed as incurred |  | 35 |  |  |  |  |  |  |  |  |
Goodwill deductible for income tax purposes |  |  |  |  |  |  |  |  |  | $ 1,667 |
Vonpar [member] | Promissory notes [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Promissory notes issued for acquisition |  | $ 6,534 |  |  |  |  |  |  | R$ 1,090 |  |
Annual rate |  | 0.375% |  |  |  |  |  |  | 0.375% |  |
Promissory notes maturity period |  | 3 years | 3 years |  |  |  |  |  |  |  |
Vonpar [member] | Series L share [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Merger result in new issue | shares |  | 27.9 |  |  |  |  |  |  | 27.9 |  |
Implicit share value per share | $ / shares |  | $ 146.27 |  |  |  |  |  |  |  |  |
Strike price per share | $ / shares |  | $ 128.88 |  |  |  |  |  |  |  |  |
Equity interests of acquirer |  | $ 485 |  |  |  |  |  |  |  |  |
Vonpar [member] | Series L share [member] | Promissory notes [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Strike price per share | $ / shares |  | $ 178.5 |  |  |  |  |  |  |  |  |
Vonpar [member] | KOF series L [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Merger result in new issue |  |  |  |  |  |  |  | 27,900,000 |  |  |
Other acquisitions [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash paid |  |  |  |  |  | $ 5,618 |  |  |  |  |
Business acquisition, consideration transferred |  |  |  |  |  | 5,612 |  |  |  |  |
Net assets for an amount |  |  |  |  |  | 2,379 |  |  |  |  |
Transaction related costs expensed as incurred |  |  |  |  |  | $ 46 |  |  |  |  |
Farmacias Acuna [member] | Colombia [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |  |
Number of drug store | Stores |  |  |  |  |  | 51 |  |  |  |  |
Specialtys Cafe and Bakery Inc [member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 50.00% |  |  |  |  |
Business acquisition, percentage of ownership interest of subsidiary |  |  |  |  |  | 80.00% |  |  |  |  |
Number of store | Stores |  |  |  |  |  | 56 |  |  |  |  |
Comercial Big John Limitada [member] | Chile [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |  |
Number of store | Stores |  |  |  |  |  | 49 |  |  |  |  |
Operadora De Farmacias Generix SAPIdeCV [member] | Country of domicile [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |  |
Number of drug store | Stores |  |  |  |  |  | 70 |  |  |  |  |
Number of distribution center | Distribution_Center |  |  |  |  |  | 1 |  |  |  |  |
Grupo Torrey [member] | Country of domicile [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |  |
Open market [member] | Colombia [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 80.00% |  |  |  |  |
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] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, cash paid |  |  |  | $ 5,692 |  |  |  |  |  |  |
Business acquisition, consideration transferred |  |  |  | 6,552 |  |  |  |  |  |  |
Net assets for an amount |  |  |  | $ 6,552 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Number of consumers reached |  |  |  | 3,400,000 |  |  |  |  |  |  |
Number of points of sale |  |  |  | 26,000 |  |  |  |  |  |  |

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