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Goodwill and Intangible Assets, Net - Summary of Goodwill Balances Allocated by Operating Segment (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill $ 194,779 $ 195,474 $ 206,319 $ 184,156
Mexico [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 7,371 7,371    
United States [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 152,486 152,486    
Spain [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 10,270 10,000    
United Kingdom [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 6,367 6,335    
France [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 4,154 4,796    
Czech Republic [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 589 709    
Colombia [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 5,874 6,146    
Dominican Republic [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 264 279    
Caribbean TCL [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 2,042 2,027    
Others South, Central America and the Caribbean [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 972 985    
Philippines [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 1,751 1,817    
United Arab Emirates [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 1,885 1,769    
Egypt [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 232 232    
Other countries [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill $ 522 $ 522