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Information by Segment - Summary of Geographic Disclosure (Parenthetical) (Detail) - MXN ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]    
Total Non Current Assets $ 454,657 $ 398,774
Mexico [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 228,201 185,857
Brazil [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 76,921 76,869
Colombia [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 17,227 16,664
Argentina [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 4,808 4,538
Chile [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 33,248 16,787
Uruguay [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets $ 5,012 $ 5,145