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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% |  |  |

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