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Significant Accounting Policies - Other current assets, Property, plant and equipment, Leases (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retail Stores [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Operating lease term 15 years    
Bottom of range [member] | Office Space [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Operating lease term 3 years    
Top of range [member] | Office Space [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Operating lease term 5 years    
Buildings [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 25 years    
Buildings [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 50 years    
Machinery and equipment [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 10 years    
Machinery and equipment [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 20 years    
Distribution equipment [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 7 years    
Distribution equipment [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 15 years    
Refrigeration equipment [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 5 years    
Refrigeration equipment [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 7 years    
Returnable bottles [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 1 year 6 months    
Returnable bottles [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 3 years    
Leasehold improvements [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 15 years    
Information technology equipment [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 3 years    
Information technology equipment [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 5 years    
Other equipment [member] | Bottom of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 3 years    
Other equipment [member] | Top of range [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 10 years    
Coca-Cola FEMSA [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amortization expense $ 213 $ 273 $ 277
Coca-Cola FEMSA [member] | PET bottles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 1 year 6 months    
Coca-Cola FEMSA [member] | Glass bottles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives of principal assets 3 years