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Intangible Assets, Net and Goodwill - Summary of Aggregate Carrying Amount of Goodwill (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 136,578,194 $ 6,635 $ 143,052,859 $ 152,899,801
Europe [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 52,307,190   53,388,139  
Brazil [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 18,017,916   18,730,686  
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 10,164,814   10,148,380  
Ecuador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,155,384   2,155,384  
Peru [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,532,770   2,710,979  
El Salvador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,510,595   2,499,544  
Chile [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,311,239   2,558,098  
Colombia [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 11,685,585   12,253,743  
Other countries [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 1,295,381   1,293,356  
United States (Tracfone) [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 0   3,362,900  
Guatemala [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 1,947,203   $ 2,301,533