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Intangible Assets, Net and Goodwill - Summary of Aggregate Carrying Amount of Goodwill (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 143,052,859 $ 7,171 $ 152,899,801 $ 145,566,497
Europe [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 53,388,139   52,950,325  
Brazil [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 18,730,686   28,062,398  
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 10,148,380   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 2,710,979   2,739,947  
El Salvador [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,499,544   2,499,552  
Chile [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 2,558,098   2,364,816  
Colombia [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 12,253,743   12,124,685  
Other countries [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 1,293,356   1,738,479  
United States (Tracfone) [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill 3,362,900   3,220,105  
Guatemala [member]        
Disclosure of carrying value of goodwill [line items]        
Goodwill $ 2,301,533   $ 3,245,613