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Significant Accounting Policies - Intangibles, Impairment, Benefits, Selling, Taxes (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
age
item
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
Disclosure of significant accounting policies [line items]        
Impairment recognized | $ $ 5,451 $ 1,018 $ 432  
Intangible assets renewable term 10 years      
Number of years of service for retirement benefits 10 years      
Benefit payment, number of days wages 12      
Years of service for seniority retirement benefits 15 years      
Distribution costs | $ $ 24,190 $ 25,068 $ 23,421  
Profit sharing computation ratio on income 10.00%      
Income tax rate 30.00% 30.00% 30.00%  
Bottom of range [member] | Customer relationships [member]        
Disclosure of significant accounting policies [line items]        
Estimated useful lives 10 years      
Bottom of range [member] | Information technology and management system costs [member]        
Disclosure of significant accounting policies [line items]        
Estimated useful lives 3 years      
Bottom of range [member] | Long-term alcohol licenses [member]        
Disclosure of significant accounting policies [line items]        
Estimated useful lives 12 years      
Top of range [member] | Customer relationships [member]        
Disclosure of significant accounting policies [line items]        
Estimated useful lives 20 years      
Top of range [member] | Information technology and management system costs [member]        
Disclosure of significant accounting policies [line items]        
Estimated useful lives 10 years      
Top of range [member] | Long-term alcohol licenses [member]        
Disclosure of significant accounting policies [line items]        
Estimated useful lives 15 years      
Mexico [member]        
Disclosure of significant accounting policies [line items]        
Number of bottling agreements 4      
Minimum age for retirement benefits | age 60      
Income tax rate   30.00% 30.00% 30.00%
Bajio Territory, Mexico [Member]        
Disclosure of significant accounting policies [line items]        
Number of bottling agreements 1      
Brazil [member]        
Disclosure of significant accounting policies [line items]        
Number of bottling agreements 2      
Guatemala [member]        
Disclosure of significant accounting policies [line items]        
Number of bottling agreements 3      
Number of bottling agreements, after renewal 2      
Argentina [member]        
Disclosure of significant accounting policies [line items]        
Number of bottling agreements 1      
Income tax rate       35.00%
Colombia [member]        
Disclosure of significant accounting policies [line items]        
Income tax rate 32.00% 33.00%    
Venezuela [member]        
Disclosure of significant accounting policies [line items]        
Number of bottling agreements 1