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Information by Segment - Summary of Geographic Disclosure (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
Geographical Elimination [member]        
Disclosure of geographical areas [line items]        
Total revenues (1,071)   (1,099) (806)
Mexico and Central America [member]        
Disclosure of geographical areas [line items]        
Total revenues 301,463   267,732 228,563
Total Non Current Assets 176,174   176,613 158,506
South America [member]        
Disclosure of geographical areas [line items]        
Total revenues 135,608   113,937 74,928
Total Non Current Assets 130,225   138,549 67,568
Venezuela [member]        
Disclosure of geographical areas [line items]        
Total revenues 3,932   18,937 8,904
Total Non Current Assets 1   7,281 3,841
Europe [member]        
Disclosure of geographical areas [line items]        
Total Non Current Assets 83,720   $ 105,229 $ 92,694
Asia [Member]        
Disclosure of geographical areas [line items]        
Total revenues 20,524      
Total Non Current Assets $ 17,233      
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3