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Basis of Preparation - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Jan. 01, 2018
MXN ($)
Dec. 31, 2018
MXN ($)
$ / $
Dec. 31, 2017
MXN ($)
Apr. 19, 2019
$ / $
Dec. 31, 2018
USD ($)
$ / $
Disclosure of detailed information about investment property [line items]          
Conversion rate of Mexican pesos to U.S. dollars   19.6350     19.6350
Description of significant influence   If the Company holds, directly or indirectly, 20 per cent or more of the voting power of the investee, it is presumed that it has significant influence, unless it can be clearly demonstrated that this is not the case. If the Company holds, directly or indirectly, less than 20 per cent of the voting power of the investee, it is presumed that the Company does not have significant influence, unless such influence can be clearly demonstrated.      
Retained earnings   $ 217,802 $ 201,868   $ 11,093 [1]
IFRS9 [member]          
Disclosure of detailed information about investment property [line items]          
Retained earnings | $ $ 379        
Total portfolio maintained in retained earnings 1.00%        
Changes in foreign exchange rates [member]          
Disclosure of detailed information about investment property [line items]          
Conversion rate of Mexican pesos to U.S. dollars       18.7705  
Increase decrease in foreign currency exchange rate       4.00%  
CCFPI [member]          
Disclosure of detailed information about investment property [line items]          
Percentage of ownership interest in joint venture     51.00%    
Percentage of ownership interest in joint venture to be acquired     49.00%    
Sale of ownership percentage   51.00%      
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3