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Intangible Assets - Disclosure of Detailed Information About Carrying Amounts of Goodwill (Detail) - MXN ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 100,082 $ 107,088
Mexico    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 56,352 56,352
Guatemala    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 1,755 1,679
Nicaragua    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 433 420
Costa Rica    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 1,425 1,442
Panama    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 1,200 1,131
Colombia    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 4,414 4,367
Brazil    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 31,741 38,765
Argentina    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 312 306
Uruguay    
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 2,450 $ 2,626