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Intangible Assets, Net and Goodwill - Summary of Aggregate Carrying Amount of Goodwill (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 152,899,801 $ 8,113 $ 145,566,497 $ 151,463,232
Europe [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 52,950,325   53,066,729  
Brazil [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 28,062,398   21,388,124  
Puerto Rico [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 17,463,394   17,463,394  
Dominican Republic [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 14,186,723   14,186,723  
Mexico [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 12,124,685   12,770,381  
Ecuador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 10,148,380   9,856,601  
Peru [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,739,947   3,086,981  
El Salvador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,364,816   2,576,214  
Chile [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,499,552   2,510,577  
Colombia [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,155,384   2,155,385  
Other countries [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 8,204,197   $ 6,505,388