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Mergers, Acquisitions and Disposals - Summary of Selected Income Statement Information Related to Business Acquisition (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 detailed information about business combination [line items]        
Income before income taxes $ 47,789 $ 2,434 $ 35,063 $ 31,208
Vonpar [member]        
Disclosure of detailed information about business combination [line items]        
Total revenues     1,628  
Income before income taxes     380  
Net income     252  
Grupo Socofar [member]        
Disclosure of detailed information about business combination [line items]        
Total revenues       7,583
Income before income taxes       394
Net income       354
Other acquisitions [member]        
Disclosure of detailed information about business combination [line items]        
Total revenues     2,400 20,262
Income before income taxes     (66) 176
Net income     $ (80) $ 120
CCFPI [member]        
Disclosure of detailed information about business combination [line items]        
Total revenues 20,524      
Income before income taxes 1,265      
Net income $ 896      
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3