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Intangible Assets, Net and Goodwill - Summary of Aggregate Carrying Amount of Goodwill (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 145,566,497 $ 7,396 $ 151,463,232 $ 152,632,635
Europe [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 53,066,729   53,143,542  
Brazil [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 21,388,124   24,708,740  
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 12,770,381   13,981,033  
Ecuador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 9,856,601   9,852,912  
Peru [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 3,086,981   3,958,110  
El Salvador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,576,214   2,834,134  
Chile [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,510,577   2,510,577  
Colombia [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,155,385   2,155,385  
Other countries [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 6,505,388   $ 6,668,682