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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, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
$ / shares
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
 [1]
Nov. 14, 2018
MXN ($)
Nov. 14, 2018
BRL (R$)
Dec. 31, 2016
BRL (R$)
Disclosure of detailed information about financial instruments [line items]                      
Borrowings   $ 126,228   $ 128,518              
Estimated fair value of borrowings   240,839   251,629   $ 259,453   $ 12,266      
Current prepaid expenses   $ 2,714   $ 2,425              
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   68.20% 68.20% 64.30% 64.30%            
Fair value [member]                      
Disclosure of detailed information about financial instruments [line items]                      
Borrowings   $ 126,321                  
Purchased call options [member] | Promissory notes [member]                      
Disclosure of detailed information about financial instruments [line items]                      
Current prepaid expenses                 $ 2,079 R$ 393  
Balance amount available   4,652         R$ 916        
Options to purchase foreign currency [Member]                      
Disclosure of detailed information about financial instruments [line items]                      
Net premium paid   43   $ 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 | R$                     R$ 1,166
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   $ 14   $ 242              
Vonpar [member] | Coca-Cola FEMSA [member]                      
Disclosure of detailed information about financial instruments [line items]                      
Percentage of out of the money   49.80% 49.80% 30.40% 30.40%            
Out of the money, strike price     $ 111   $ 82            
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           $ 178.5          
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3