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Significant Accounting Policies - Additional Information (Detail)
€ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Oct. 19, 2017
Apr. 30, 2017
Jan. 01, 2017
Nov. 30, 2016
Sep. 30, 2017
USD ($)
Dec. 31, 2017
MXN ($)
$ / $
Bs. / $
yr
Age
Agreement
Dec. 31, 2017
USD ($)
yr
Age
Agreement
Dec. 31, 2017
EUR (€)
yr
Age
Agreement
Dec. 31, 2016
MXN ($)
Bs. / $
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
MXN ($)
Dec. 31, 2015
EUR (€)
Apr. 20, 2018
$ / $
Jan. 30, 2018
Bs. / $
Dec. 31, 2017
USD ($)
$ / $
Bs. / $
Dec. 31, 2017
EUR (€)
$ / $
Bs. / $
Dec. 31, 2016
USD ($)
Bs. / $
Dec. 31, 2016
EUR (€)
Bs. / $
Disclosure of significant accounting policies [line items]                                    
Goodwill recognized           $ 0                        
Sale percentage of investment           5.20% 5.20% 5.20%                    
Other comprehensive income to consolidated net income           $ 6,632,000,000                        
Other expenses amount           33,958,000,000     $ 5,909,000,000   $ 2,741,000,000              
Foreign currency translation losses           14,482,000,000 $ 737 [1]   30,763,000,000   (2,234,000,000)              
Net sale           459,763,000,000 23,410 [1]   398,622,000,000   310,849,000,000              
Losses           37,206,000,000 $ 1,895 [1]   27,175,000,000   23,276,000,000              
Assets           588,541,000,000     545,623,000,000   409,332,000,000       $ 29,967 [1]      
Liabilities           $ 251,629,000,000     259,453,000,000   167,476,000,000       $ 12,812 [1]      
Exchange rate | $ / $           19.6395                 19.6395 19.6395    
Recognized interest income on loans and receivables                 41,000,000   53,000,000              
Amortization expense           $ 1,259,000,000     1,016,000,000   604,000,000              
Automatic renewable term           10 years 10 years 10 years                    
Impairment recognized           $ 2,063,000,000         134,000,000              
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           $ 25,041,000,000     $ 20,250,000,000   $ 20,205,000,000              
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                    
Coeficiente de Estabilizacion de Referencia [member]                                    
Disclosure of significant accounting policies [line items]                                    
Cumulative inflation percentage   95.50%                                
Cumulative Inflation Period   Three-year                                
WPI [member]                                    
Disclosure of significant accounting policies [line items]                                    
Cumulative inflation percentage       92.20%                            
Cumulative Inflation Period       Three years                            
Changes in foreign exchange rates [member]                                    
Disclosure of significant accounting policies [line items]                                    
Exchange rate | $ / $                         18.6145          
Heineken [member]                                    
Disclosure of significant accounting policies [line items]                                    
Goodwill recognized           $ 20,761,000,000     $ 26,116,000,000             € 881   € 1,200
Sale percentage of investment         5.20%                          
Other comprehensive income to consolidated net income         $ 6,632                          
Amortization expense           7,656,000,000   € 357 6,430,000,000 € 308 $ 6,567,000,000 € 378            
Coca-Cola FEMSA [member]                                    
Disclosure of significant accounting policies [line items]                                    
Amortization expense           $ 759,000,000     $ 582,000,000   $ 317,000,000              
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] | Changes in foreign exchange rates [member]                                    
Disclosure of significant accounting policies [line items]                                    
Exchange rate | Bs. / $                           25,000        
Coca-Cola FEMSA [member] | DIPRO [member]                                    
Disclosure of significant accounting policies [line items]                                    
Liabilities recorded using exchange rate                                 $ 629  
Exchange rate | Bs. / $                 10               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 22,793 673.76 673.76
Description of identity of price index                 Coca-Cola FEMSA has U.S. $104 million recorded at DICOM (Divisas Complementarias) exchange rate at 673.76 bolivars per U.S. dollar. Coca-Cola FEMSA has U.S. $104 million recorded at DICOM (Divisas Complementarias) exchange rate at 673.76 bolivars per U.S. dollar.                
Venezuela [member]                                    
Disclosure of significant accounting policies [line items]                                    
Cumulative inflation percentage           100.00% 100.00% 100.00%                    
Cumulative inflation period           Three preceding years Three preceding years Three preceding years                    
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                        
Foreign currency translation losses           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           10 10 10                    
Brazil [member] | Coca-Cola FEMSA [member]                                    
Disclosure of significant accounting policies [line items]                                    
Number of bottler agreements | Agreement           9 9 9                    
Argentina [member]                                    
Disclosure of significant accounting policies [line items]                                    
Income tax rate           35.00% 35.00% 35.00%                    
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%            
Colombia [member] | Bottom of range [member]                                    
Disclosure of significant accounting policies [line items]                                    
Income tax rate                     5.00% 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           1 1 1                    
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                    
Philippines [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