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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
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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

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