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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
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