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Financial Instruments - Additional Information (Detail)
$ / shares in Units, R$ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 06, 2016
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
BRL (R$)
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of detailed information about financial instruments [line items]                
Borrowings   $ 128,518         $ 137,336  
Estimated fair value of borrowings   $ 251,629       $ 12,812 259,453 $ 167,476
Liquidity risk [member]                
Disclosure of detailed information about financial instruments [line items]                
Percentage of outstanding consolidated total indebtedness at the level of its sub-holding companies   64.30% 64.30%   64.50%      
Fair value [member]                
Disclosure of detailed information about financial instruments [line items]                
Borrowings   $ 133,318            
Options to purchase foreign currency [Member]                
Disclosure of detailed information about financial instruments [line items]                
Net premium paid   7            
Vonpar [member]                
Disclosure of detailed information about financial instruments [line items]                
Date of acquisition Dec. 06, 2016              
Vonpar [member] | Promissory notes [member]                
Disclosure of detailed information about financial instruments [line items]                
Borrowings, interest rate 0.375%              
Vonpar [member] | Spal [member] | Promissory notes [member]                
Disclosure of detailed information about financial instruments [line items]                
Borrowings, maturity         Three-year      
Borrowings   6,503   R$ 1,090     $ 7,022  
Borrowings, interest rate       0.375%     0.375%  
Vonpar [member] | Purchased call options [member] | Promissory notes [member] | Fair value [member]                
Disclosure of detailed information about financial instruments [line items]                
Estimated fair value of borrowings at inception of option   343            
Estimated fair value of borrowings   $ 242         $ 368  
Vonpar [member] | Coca-Cola FEMSA [member]                
Disclosure of detailed information about financial instruments [line items]                
Percentage of out of the money   30.40% 30.40%   35.90%      
Out of the money, strike price     $ 82   $ 93      
Vonpar [member] | Coca-Cola FEMSA [member] | Promissory notes [member] | Series L share [member]                
Disclosure of detailed information about financial instruments [line items]                
Share strike price | $ / shares       R$ 178.5        
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3