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Intangible Assets - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
MXN ($)
BasisPoint
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Mar. 28, 2017
MXN ($)
Disclosure of detailed information about intangible assets [line items]        
Impairment recognized $ 2,063,000,000   $ 134,000,000  
Risk premium basis points | BasisPoint 100      
Total carrying amount of goodwill $ 0      
Impairment charge on goodwill 0      
Vonpar [member]        
Disclosure of detailed information about intangible assets [line items]        
Cash acquired 1,287,000,000     $ 1,287,000,000
Total carrying amount of goodwill 2,152,000,000      
Health Division [member]        
Disclosure of detailed information about intangible assets [line items]        
Total carrying amount of goodwill $ 6,048,000,000      
Coca-Cola FEMSA [member]        
Disclosure of detailed information about intangible assets [line items]        
Risk premium basis points | BasisPoint 100      
Venezuela [member]        
Disclosure of detailed information about intangible assets [line items]        
Impairment recognized $ 2,053,000,000      
Venezuela [member] | Coca-Cola FEMSA [member]        
Disclosure of detailed information about intangible assets [line items]        
Impairment recognized 745,000,000      
Other [member]        
Disclosure of detailed information about intangible assets [line items]        
Borrowing costs capitalized   $ 8,000,000 28,000,000  
Qualifying assets   $ 28,000,000 $ 410,000,000  
Effective interest rate used to determine amount of borrowing costs eligible for capitalization   4.10% 4.10%  
Intangible assets and goodwill [member]        
Disclosure of detailed information about intangible assets [line items]        
Borrowing costs capitalized $ 0