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Intangible Assets - Disclosure of Detailed Information About Carrying Amounts of Goodwill (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 118,130 $ 118,920
Mexico [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 56,352 55,137
Guatemala [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 488 499
Nicaragua [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 484 532
Costa Rica [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 1,520 1,622
Panama [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 1,185 1,241
Colombia [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 5,824 5,988
Venezuela [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill   1,225
Brazil [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 48,345 52,609
Argentina [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 50 $ 67
Philippinnes [member]    
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 3,882