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Revenue (Detail)
$ in Millions, $ in Millions
 12 Months Ended
May 15, 2020
item
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues   $ 24,782 $ 492,966 $ 506,711 $ 469,744  
Number of market leaders | item 2          
Mexico [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     320,694 346,659 319,792  
Brazil [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     62,758 67,076 63,601  
Colombia [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     14,800 16,440 19,245  
Argentina [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     5,531 6,857   $ 9,237
Chile [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     47,208 45,276 44,576  
Uruguay [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     3,124 3,421 1,925  
Ecuador [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     9,467 6,539    
Coca-Cola FEMSA [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     178,599 188,784 177,182  
FEMSA Comercio Proximity Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     180,826 184,485 167,168  
FEMSA Comercio Health Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     65,172 58,922 51,739  
FEMSA Comercio Fuel Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     34,283 47,841 46,936  
Other [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     34,086 26,679 26,719  
Operating segments [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     513,770 527,843 490,768  
Operating segments [member] | Mexico and Central America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     357,412 380,352 352,954  
Operating segments [member] | United States [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     12,265      
Operating segments [member] | South America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     144,093 147,473 137,789  
Operating segments [member] | Venezuela [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues       18 25  
Operating segments [member] | Coca-Cola FEMSA [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     183,615 194,471 182,342  
Operating segments [member] | Coca-Cola FEMSA [member] | Mexico and Central America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     106,783 109,249 100,162  
Operating segments [member] | Coca-Cola FEMSA [member] | South America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     76,832 85,223 82,180  
Operating segments [member] | FEMSA Comercio Proximity Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     181,277 184,810 167,458  
Operating segments [member] | FEMSA Comercio Proximity Division [member] | Mexico and Central America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     179,218 182,864 166,040  
Operating segments [member] | FEMSA Comercio Proximity Division [member] | United States [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     15      
Operating segments [member] | FEMSA Comercio Proximity Division [member] | South America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     2,044 1,946 1,418  
Operating segments [member] | FEMSA Comercio Health Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     65,172 58,922 51,739  
Operating segments [member] | FEMSA Comercio Health Retail Division [member] | Mexico and Central America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     9,716 8,170 7,898  
Operating segments [member] | FEMSA Comercio Health Retail Division [member] | South America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     55,456 50,752 43,841  
Operating segments [member] | FEMSA Comercio Fuel Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     34,292 47,852 46,936  
Operating segments [member] | FEMSA Comercio Fuel Retail Division [member] | Mexico and Central America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     34,292 47,852 46,936  
Operating segments [member] | Other [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     49,414 41,788 42,293  
Operating segments [member] | Other [member] | Mexico and Central America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     27,403 32,217 31,918  
Operating segments [member] | Other [member] | United States [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     12,250      
Operating segments [member] | Other [member] | South America [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     9,761 9,552 10,350  
Operating segments [member] | Other [member] | Venezuela [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues       18 25  
Operating segments [member] | Goods Offered For Sale [Member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     487,610 499,254 461,715  
Operating segments [member] | Goods Offered For Sale [Member] | Coca-Cola FEMSA [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     183,615 194,472 182,342  
Operating segments [member] | Goods Offered For Sale [Member] | FEMSA Comercio Proximity Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     181,277 184,810 167,458  
Operating segments [member] | Goods Offered For Sale [Member] | FEMSA Comercio Health Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     65,172 58,922 51,739  
Operating segments [member] | Goods Offered For Sale [Member] | FEMSA Comercio Fuel Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     34,292 47,852 46,936  
Operating segments [member] | Goods Offered For Sale [Member] | Other [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     23,254 13,198 13,240  
Operating segments [member] | Services Provided To Customers [Member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     26,160 28,589 29,053  
Operating segments [member] | Services Provided To Customers [Member] | Other [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     26,160 28,589 29,053  
Consolidation adjustments [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     (20,804) (21,132) (21,024)  
Consolidation adjustments [member] | Coca-Cola FEMSA [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     (5,016) (5,688) (5,160)  
Consolidation adjustments [member] | FEMSA Comercio Proximity Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     (451) (325) (290)  
Consolidation adjustments [member] | FEMSA Comercio Fuel Retail Division [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     (9) (11)    
Consolidation adjustments [member] | Other [member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Consolidated revenues     $ (15,328) $ (15,108) $ (15,574)  
Acquisition Of WAXIE Sanitary Supply And North American Corporation [Member]            
Disclosure of disaggregation of revenue from contracts with customers [line items]            
Number of market leaders | item 2          
Percentage of voting equity interests acquired 89.00% 89.50% 89.50%