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Revenue - Summary of Disaggregation of Revenue by Geographic Area, Business Unit and Products and Services Categories (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale $ 468,894 $ 23,881 $ 439,239 [2] $ 398,622
Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 469,744   439,932 399,507
Services revenues 29,053   27,064 23,132
Operating segments [member] | Mexico and Central America [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 352,954   316,253 280,989
Operating segments [member] | South America [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 137,789   138,318 116,341
Operating segments [member] | Venezuela [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 25   4,059 19,049
Operating segments [member] | Goods or services transferred at point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale 461,715   431,566 393,247
Operating segments [member] | Coca-Cola FEMSA [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 177,182   178,578 173,449
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 100,162   92,643 87,557
Operating segments [member] | Coca-Cola FEMSA [member] | South America [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 82,180   86,608 71,293
Operating segments [member] | Coca-Cola FEMSA [member] | Venezuela [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues     4,005 18,868
Operating segments [member] | Coca-Cola FEMSA [member] | Goods or services transferred at point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale 182,342   183,256 177,718
Operating segments [member] | FEMSA Comercio Proximity Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 167,168   149,632 133,224
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 166,040   148,652 132,433
Operating segments [member] | FEMSA Comercio Proximity Division [member] | South America [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 1,418   1,181 795
Operating segments [member] | FEMSA Comercio Proximity Division [member] | Goods or services transferred at point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale 167,458   149,834 133,228
Operating segments [member] | FEMSA Comercio Health Retail Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 51,739   47,421 43,411
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 7,898   7,359 7,159
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 43,841   40,062 36,252
Operating segments [member] | FEMSA Comercio Health Retail Division [member] | Goods or services transferred at point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale 51,739   47,421 43,411
Operating segments [member] | FEMSA Comercio Fuel Retail Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 46,936   38,388 28,616
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 46,936   38,388 28,616
Operating segments [member] | FEMSA Comercio Fuel Retail Division [member] | Goods or services transferred at point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale 46,936   38,388 28,616
Operating segments [member] | Other [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 26,719   25,913 20,807
Services revenues 29,053   27,064 23,132
Operating segments [member] | Other [member] | Mexico and Central America [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 31,918   29,211 25,224
Operating segments [member] | Other [member] | South America [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 10,350   10,467 8,001
Operating segments [member] | Other [member] | Venezuela [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 25   54 181
Operating segments [member] | Other [member] | Goods or services transferred at point in time [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Products sold in the point-of-sale 13,240   12,667 10,274
Operating segments [member] | Total revenues [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 490,768   458,630 416,379
Operating segments [member] | Total revenues [member] | Coca-Cola FEMSA [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 182,342   183,256 177,718
Operating segments [member] | Total revenues [member] | FEMSA Comercio Proximity Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 167,458   149,833 133,228
Operating segments [member] | Total revenues [member] | FEMSA Comercio Health Retail Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 51,739   47,421 43,411
Operating segments [member] | Total revenues [member] | FEMSA Comercio Fuel Retail Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 46,936   38,388 28,616
Operating segments [member] | Total revenues [member] | Other [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 42,293   39,732 33,406
Operating segments [member] | Consolidation adjustments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 21,024   18,698 16,872
Operating segments [member] | Consolidation adjustments [member] | Coca-Cola FEMSA [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 5,160   4,678 4,269
Operating segments [member] | Consolidation adjustments [member] | FEMSA Comercio Proximity Division [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues 290   202 4
Operating segments [member] | Consolidation adjustments [member] | Other [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Consolidated revenues $ 15,574   $ 13,818 $ 12,599
[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