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Mergers, Acquisitions and Disposals - Summary of Selected Income Statement Information Related to Business Acquisition (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Vonpar [member]      
Disclosure of detailed information about business combination [line items]      
Total revenues     $ 1,628
Income before income taxes     380
Net income     252
Other acquisitions [member]      
Disclosure of detailed information about business combination [line items]      
Total revenues     2,400
Income before income taxes     (66)
Net income     $ (80)
CCFPI [member]      
Disclosure of detailed information about business combination [line items]      
Total revenues   $ 20,524  
Income before income taxes   1,265  
Net income   $ 896  
Coca-Cola FEMSA [member] | Other acquisitions [member]      
Disclosure of detailed information about business combination [line items]      
Total revenues $ 4,628    
Income before income taxes 496    
Net income $ 413