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Significant Accounting Policies - Additional Information (Detail)
€ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Oct. 19, 2017
Jan. 01, 2017
Sep. 30, 2017
USD ($)
Dec. 31, 2018
MXN ($)
$ / $
yr
Age
Agreement
Dec. 31, 2018
USD ($)
yr
Age
Agreement
Dec. 31, 2018
EUR (€)
yr
Age
Agreement
Dec. 31, 2017
MXN ($)
Bs. / $
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
MXN ($)
Bs. / $
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
Dec. 31, 2018
USD ($)
$ / $
Dec. 31, 2018
EUR (€)
$ / $
Jan. 30, 2018
Bs. / $
Dec. 31, 2017
EUR (€)
Bs. / $
Dec. 31, 2016
USD ($)
Bs. / $
Disclosure of significant accounting policies [line items]                                
Goodwill recognized       $ 0                        
Sale percentage of investment             5.20% 5.20%                
Other comprehensive income to consolidated net income             $ 6,632,000,000                  
Other expenses amount       2,947,000,000     33,866,000,000   $ 5,909,000,000              
Exchange differences on translation of foreign subsidiaries and equity accounted investees in equity       (13,174,000,000) $ (671) [1]   14,482,000,000   30,763,000,000              
Net sale       468,894,000,000 23,881 [1]   439,239,000,000 [2]   398,622,000,000              
Losses       33,079,000,000 $ 1,684 [1]   37,206,000,000 [2]   27,175,000,000              
Assets       576,381,000,000     588,541,000,000   545,623,000,000     $ 29,355 [1]        
Liabilities       $ 240,839,000,000     251,629,000,000   259,453,000,000     $ 12,266 [1]        
Exchange rate | $ / $       19.6350               19.6350 19.6350      
Cumulative inflation percentage       100.00% 100.00% 100.00%                    
Cumulative inflation period       Three preceding years Three preceding years Three preceding years                    
Recognized interest income on loans and receivables       $ 0     0   41,000,000              
Amortization expense       $ 1,913,000,000     1,259,000,000   1,016,000,000              
Automatic renewable term       10 years 10 years 10 years                    
Impairment recognized       $ 432,000,000     2,063,000,000                  
Gain or loss recognized in profit or loss       $ 0                        
Minimum year of service for retirement benefits | yr       10 10 10                    
Minimum age for retirement benefits | Age       60 60 60                    
Minimum wages or salary for service       12 days 12 days 12 days                    
Maximum wages or salary for service       15 years 15 years 15 years                    
Distribution costs       $ 23,421,000,000     $ 20,800,000,000   $ 20,250,000,000              
Profit sharing computation ratio on income       10.00% 10.00% 10.00%                    
Income tax rate 8.00%     30.00% 30.00% 30.00% 30.00% 30.00% 30.00% 30.00%            
Bottom of range [member] | Information technology and management system costs [member]                                
Disclosure of significant accounting policies [line items]                                
Estimated useful lives       3 years 3 years 3 years                    
Bottom of range [member] | Long-term alcohol licenses [member]                                
Disclosure of significant accounting policies [line items]                                
Estimated useful lives       12 years 12 years 12 years                    
Top of range [member] | Information technology and management system costs [member]                                
Disclosure of significant accounting policies [line items]                                
Estimated useful lives       10 years 10 years 10 years                    
Top of range [member] | Long-term alcohol licenses [member]                                
Disclosure of significant accounting policies [line items]                                
Estimated useful lives       15 years 15 years 15 years                    
Heineken [member]                                
Disclosure of significant accounting policies [line items]                                
Goodwill recognized       $ 19,850,000,000     $ 20,761,000,000           € 881   € 881  
Sale percentage of investment     5.20%                          
Other comprehensive income to consolidated net income     $ 6,632                          
Amortization expense       6,320,000,000   € 281 7,656,000,000 € 357 $ 6,430,000,000 € 308            
Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Exchange rate | Bs. / $                           25,000    
Amortization expense       $ 277,000,000     $ 759,000,000   $ 582,000,000              
Coca-Cola FEMSA [member] | PET bottles [member]                                
Disclosure of significant accounting policies [line items]                                
Estimated useful lives       1.5 years 1.5 years 1.5 years                    
Coca-Cola FEMSA [member] | Glass bottles [member]                                
Disclosure of significant accounting policies [line items]                                
Estimated useful lives       3 years 3 years 3 years                    
Coca-Cola FEMSA [member] | DIPRO [member]                                
Disclosure of significant accounting policies [line items]                                
Liabilities recorded using exchange rate                               $ 629
Exchange rate | Bs. / $                 10             10
Coca-Cola FEMSA [member] | DICOM [member]                                
Disclosure of significant accounting policies [line items]                                
Liabilities recorded using exchange rate                               $ 104
Exchange rate | Bs. / $             22,793   673.76           22,793 673.76
Description of identity of price index                 Coca-Cola FEMSA has U.S. $104 million recorded at Divisas Complementarias ("DICOM") exchange rate at 673.76 bolivars per U.S. dollar. Coca-Cola FEMSA has U.S. $104 million recorded at Divisas Complementarias ("DICOM") exchange rate at 673.76 bolivars per U.S. dollar.            
Venezuela [member]                                
Disclosure of significant accounting policies [line items]                                
Impairment recognized       $ 2,053,000,000                        
Venezuela [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Other expenses amount             $ 28,177,000,000                  
Other expense reclassification             26,123,000,000                  
Exchange differences on translation of foreign subsidiaries and equity accounted investees in equity             745,000,000                  
Impairment charge             1,098,000,000                  
Distribution rights             210,000,000                  
Net sale             4,005,000,000                  
Losses             2,223,000,000                  
Assets             4,138,000,000                  
Liabilities             2,889,000,000                  
Number of bottler agreements | Agreement       1 1 1                    
Impairment recognized             $ 745,000,000                  
Mexico [member]                                
Disclosure of significant accounting policies [line items]                                
Income tax rate       30.00% 30.00% 30.00% 30.00% 30.00% 30.00% 30.00%            
Mexico [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       4 4 4                    
Brazil [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       2 2 2                    
Argentina [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       1 1 1                    
Colombia [member]                                
Disclosure of significant accounting policies [line items]                                
Income tax rate   9.00%   9.00% 9.00% 9.00% 8.00% 8.00% 6.00% 6.00% 5.00%          
Colombia [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       1 1 1                    
Guatemala [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       3 3 3                    
Costa Rica [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       1 1 1                    
Nicaragua [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       1 1 1                    
Panama [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       1 1 1                    
Uruguay [member] | Coca-Cola FEMSA [member]                                
Disclosure of significant accounting policies [line items]                                
Number of bottler agreements | Agreement       1 1 1                    
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3
[2] Revised to reflect the discontinued Philippines operations of Coca-Cola FEMSA - See Note 4.2.1