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Information by Segment - Summary of Geographic Disclosure (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of geographical areas [line items]        
Total revenues $ 460,456 $ 23,445 $ 399,507 $ 311,589
Total Non Current Assets 407,353   427,672 322,609
Mexico [member]        
Disclosure of geographical areas [line items]        
Total revenues 288,783   254,643 218,809
Total Non Current Assets 170,547   168,976  
Brazil [member]        
Disclosure of geographical areas [line items]        
Total revenues 64,345   48,924 39,749
Total Non Current Assets 89,137   97,127  
Colombia [member]        
Disclosure of geographical areas [line items]        
Total revenues 17,545   17,027 14,283
Total Non Current Assets 18,396   18,835  
Argentina [member]        
Disclosure of geographical areas [line items]        
Total revenues 13,938   12,340 $ 14,004
Total Non Current Assets 3,052   3,159  
Chile [member]        
Disclosure of geographical areas [line items]        
Total revenues 40,660   36,631  
Total Non Current Assets $ 19,590   $ 19,367  
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3