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Mergers and Acquisitions - Summary of CCFPI Fair Value of Net Assets Acquired (Detail)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2017
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of Detailed Information About Business Combination [Line Items]            
TOTAL ASSETS   $ 285,677   $ 14,546 $ 279,256 $ 210,249
Total liabilities   (144,967)   $ (7,381) $ (150,023) $ (101,514)
Total net effect in P&L   $ 2,996 $ 153      
Coca-Cola FEMSA Philippines, Inc. [member]            
Disclosure of Detailed Information About Business Combination [Line Items]            
Total current assets, including cash acquired $ 9,645          
Total non-current assets 18,909          
Distribution rights 4,144          
TOTAL ASSETS 32,698          
Total liabilities (10,101)          
Net assets acquired 22,597          
Net assets acquired attributable to the parent company (51%) 11,524          
Non-controlling interest (49%) (11,073)          
Fair value of the equity of CCFPI at the acquisition date 22,110          
Carrying value of CCFPI investment derecognized 11,690          
Loss as a result of remeasuring to fair value the equity interest (166)          
Gain on recycling of other comprehensive income -translation effects 2,996          
Total net effect in P&L $ 2,830