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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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Dec. 06, 2016 BRL (R$) shares | Dec. 06, 2016 MXN ($) $ / shares | Sep. 30, 2015 MXN ($) Stores | Dec. 31, 2017 MXN ($) $ / shares | Dec. 31, 2016 MXN ($) Stores Distribution_Center $ / shares | Dec. 31, 2015 MXN ($) Stores Center Unit Station | May 04, 2017 USD ($) | Dec. 06, 2016 MXN ($) shares $ / 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 |  |  |  |  |  |
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%
Vonpar [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
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 | R$ 3,508 |  |  | $ 21,478 |  |  |  | $ 20,992 |  |
Business acquisition, cash paid | 1,730 |  |  | 13,198 |  |  |  | 10,370 |  |
Business acquisition, additionally cash paid | 688 | $ 4,124 |  |  |  |  |  |  |  |
Business acquisition, capitalized amount |  | 4,082 |  |  |  |  |  |  |  |
Net assets for an amount |  |  |  | 19,325 |  |  | $ 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 | R$ 1,090 |  |  |  |  |  |  | $ 6,534 |  |
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 |  |  |
Grupo Socofar [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  | 60.00% |  |  |  |  |  |  |
Date of acquisition |  |  | Sep. 30, 2015 |  |  |  |  |  |  |
Business acquisition, consideration transferred |  |  | $ 7,685 |  | $ 7,685 |  |  |  |  |
Net assets for an amount |  |  |  |  | 5,208 |  |  |  |  |
Transaction related costs expensed as incurred |  |  | $ 116 |  |  |  |  |  |  |
Interest held by non controlling interest |  |  |  | 40.00% |  |  |  |  |  |
Description of option contract with noncontrolling interest |  |  |  | The former controlling shareholders of Socofar may be able to put some or all of that interest to FEMSA Comercio - Health Division beginning (i) 42-months after the initial acquisition, upon the occurrence of certain events and (ii) 60 months after the initial acquisition, in any event, FEMSA Comercio - Health Division can call the remaining 40% non-controlling interest beginning on the seventh anniversary of the initial acquisition date. |  |  |  |  |  |
Grupo Socofar [member] | Chile [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Number of pharmacy stores | Stores |  |  | 643 |  |  |  |  |  |  |
Number of beauty supply stores | Stores |  |  | 154 |  |  |  |  |  |  |
Grupo Socofar [member] | Colombia [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Number of pharmacy stores | Stores |  |  | 150 |  |  |  |  |  |  |
Other acquisitions [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Business acquisition, consideration transferred |  |  |  |  | 5,612 | $ 6,074 |  |  |  |
Business acquisition, cash paid |  |  |  |  | 5,618 |  |  |  |  |
Net assets for an amount |  |  |  |  | 2,379 | 1,047 |  |  |  |
Transaction related costs expensed as incurred |  |  |  |  | $ 46 | 39 |  |  |  |
Consideration transferred |  |  |  |  |  | $ 5,892 |  |  |  |
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% |  |  |  |  |
Percentage of ownership after acquisition of additional interest |  |  |  |  | 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] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Interest held by non controlling interest |  |  |  | 20.00% |  |  |  |  |  |
Description of option contract with noncontrolling interest |  |  |  | (i) at any time after the acquisition date upon the occurrence of certain events and (ii) annually from January through April, after the third anniversary of the acquisition date. In any event, the Company through one of its subsidiaries can call the remaining 20% non-controlling interest annually from January through April, after the fifth anniversary of the acquisition date. |  |  |  |  |  |
Open market [member] | Colombia [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  | 80.00% |  |  |  |  |
Farmacias Farmacon [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 |  |  |  |  |  | 215 |  |  |  |
PEMEX Franchises [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 gas stations | Station |  |  |  |  |  | 227 |  |  |  |
Zimag [member] | Country of domicile [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |
Atlas Transportes e Logistica [member] | Brazil [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |  |  |
Number of operative center | Center |  |  |  |  |  | 49 |  |  |  |
Number of freight unit | Unit |  |  |  |  |  | 1,200 |  |  |  |

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