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Financial Instruments - Additional Information (Detail)
$ / shares in Units, R$ in Millions, $ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 06, 2016
Jun. 30, 2019
MXN ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2016
BRL (R$)
$ / shares
Jun. 30, 2019
USD ($)
 [1],[2]
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
MXN ($)
Nov. 14, 2018
BRL (R$)
Nov. 14, 2018
MXN ($)
Jun. 30, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of detailed information about financial instruments [line items]                          
Borrowings   $ 119,394             $ 126,228        
Estimated fair value of borrowings   300,291 [1]         $ 15,633   $ 240,839     $ 240,839  
Fair value [member]                          
Disclosure of detailed information about financial instruments [line items]                          
Borrowings   124,891                      
Purchased call options [member] | Promissory notes [member]                          
Disclosure of detailed information about financial instruments [line items]                          
Current prepaid expenses                   R$ 393 $ 2,079    
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   23   $ 43                  
Vonpar [member]                          
Disclosure of detailed information about financial instruments [line items]                          
Date of acquisition Dec. 06, 2016                        
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%              
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                     $ 14
Vonpar [member] | Coca-Cola FEMSA [member]                          
Disclosure of detailed information about financial instruments [line items]                          
Percentage of out of the money   49.90% 49.90% 49.80% 49.80%                
Out of the money, strike price     $ 81   $ 111                
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] The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] Convenience translation to U.S. dollars ($) - See Note 2.2.3