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Intangible Assets - Intangible Assets,Other Than Goodwill,Amortisation Allocation (Detail) - MXN ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Statement [line items]    
Amortisation, intangible assets other than goodwill $ 793 $ 706
Cost of goods sold [member]    
Statement [line items]    
Amortisation, intangible assets other than goodwill 20 23
Administrative expenses [member]    
Statement [line items]    
Amortisation, intangible assets other than goodwill 588 509
Selling expenses [member]    
Statement [line items]    
Amortisation, intangible assets other than goodwill $ 185 $ 174