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Intangible Assets, Net and Goodwill - Summary of Aggregate Carrying Amount of Goodwill (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 151,463,232 $ 7,655 $ 152,632,635 $ 137,113,716
Europe [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 53,143,542   52,207,877  
Brazil [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 24,708,740   26,106,623  
Puerto Rico [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 17,463,394   17,463,393  
Dominican Republic [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 14,186,723   14,186,724  
Mexico [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 9,852,912   9,936,857  
Ecuador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,155,385   2,155,385  
Peru [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 3,958,110   3,792,950  
El Salvador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,510,577   2,510,596  
Chile [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,834,134   2,758,653  
Colombia [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 13,981,033   14,659,892  
Other countries [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 6,668,682   $ 6,853,685