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Mergers, Acquisitions and Disposals - Summary of Purchase Price to Fair Value of Net Assets Acquired and Reconciliation of Cash Flows (Parenthetical) (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
May 04, 2017
Mar. 28, 2017
Dec. 31, 2016
Dec. 06, 2016
Jan. 02, 2016
Jan. 25, 2013
CCFPI [member]              
Disclosure of detailed information about business combination [line items]              
Non-controlling majority stake acquired 51.00%           51.00%
Total non-current assets $ 18,909            
Intangible assets recognised as of acquisition date 11,524            
CCFPI [member] | Distribution rights [member]              
Disclosure of detailed information about business combination [line items]              
Intangible assets recognised as of acquisition date 4,144            
Vonpar [member]              
Disclosure of detailed information about business combination [line items]              
Non-controlling majority stake acquired   100.00%     100.00%    
Cash acquired 1,287   $ 1,287        
Total non-current assets 11,344            
Goodwill           $ (1,667)  
Vonpar [member] | Effect of acquisition [member]              
Disclosure of detailed information about business combination [line items]              
Total non-current assets       $ 490      
Goodwill       (5,681)      
Vonpar [member] | Distribution rights [member]              
Disclosure of detailed information about business combination [line items]              
Intangible assets recognised as of acquisition date 14,793            
Vonpar [member] | Distribution rights [member] | Effect of acquisition [member]              
Disclosure of detailed information about business combination [line items]              
Intangible assets recognised as of acquisition date       5,192      
Other acquisitions [member]              
Disclosure of detailed information about business combination [line items]              
Cash acquired       211      
Total non-current assets       $ 3,316      
Other acquisitions [member] | Effect of acquisition [member]              
Disclosure of detailed information about business combination [line items]              
Property, plant and equipment 32            
Other liabilities as of acquisition date 593            
Other acquisitions [member] | Trademark rights [member] | Effect of acquisition [member]              
Disclosure of detailed information about business combination [line items]              
Intangible assets recognised as of acquisition date 836            
Other acquisitions [member] | Other [member] | Effect of acquisition [member]              
Disclosure of detailed information about business combination [line items]              
Intangible assets recognised as of acquisition date $ 983