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Balances and Transactions with Related Parties and Affiliated Companies - Transactions (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]      
Expense resulting from the uncollectibility of balances due from related parties $ 0 $ 0 $ 0
Expenses:      
Other expenses with related parties 619 319 423
Other revenue [member]      
Income:      
Income from related party transaction 764 404 242
The Coca-Cola Company [member]      
Expenses:      
Contributions 1,482 2,274 3,542
The Coca-Cola Company [member] | Concentrate [member]      
Expenses:      
Purchase of goods from related party transaction 32,222 34,063 32,379
The Coca-Cola Company [member] | Advertising [Member]      
Expenses:      
Services received, related party transaction 865 1,756 2,193
Heineken Group      
Income:      
Income from related party transaction 3,181 3,380 3,265
Heineken Group | Beer [member]      
Expenses:      
Purchase of goods from related party transaction 23,233 25,215 27,999
Grupo Industrial Saltillo, S.A. de C.V. [member] | Logistic services [member]      
Income:      
Income from related party transaction     255
Jugos del Valle, S.A.P.I. de C.V. [member] | Logistic services [member]      
Income:      
Income from related party transaction 532 553 369
Jugos del Valle, S.A.P.I. de C.V. [member] | Juices [member]      
Expenses:      
Purchase of goods from related party transaction 4,055 4,477 4,537
Grupo Industrial Bimbo, S.A.B. de C. V. [member] | Baked goods and snacks [member]      
Expenses:      
Purchase of goods from related party transaction 5,774 6,194 5,763
Promotora Industrial Azucarera, S.A. de C.V. [member] | Sugar [member]      
Expenses:      
Purchase of goods from related party transaction 2,123 2,728 2,604
BBVA Bancomer, S.A. de C.V. [member]      
Expenses:      
Interest expense and fee paid to related party transaction 232 144 230
BBVA Bancomer, S.A. de C.V. [member] | Interest Revenue [Member]      
Expenses:      
Interest expense and fee paid to related party transaction 1,825 1,456 1,469
Beta San Miguel [member] | Sugar [member]      
Expenses:      
Purchase of goods from related party transaction 1,023 655 651
Promotora Mexicana de Embotelladores, S.A. de C.V. [member] | Sugar, cans and aluminum lids [member]      
Expenses:      
Purchase of goods from related party transaction     739
Industria Envasadora De Queretaro SA De CVIEQSA [member] | Canned products [member]      
Expenses:      
Purchase of goods from related party transaction 226 682 596
Leao Alimentos e Bebidas, LTDA [member] | Inventory [member]      
Expenses:      
Purchase of goods from related party transaction 1,253 1,867 2,654
Ecolab Inc [Member] | Materials [Member]      
Expenses:      
Purchase of goods from related party transaction 340    
Grupo Televisa, S.A.B. de C.V. [member] | Advertising [Member]      
Expenses:      
Services received, related party transaction 148 115 113
Grupo Nacional Provincial, S.A.B. [Member]      
Expenses:      
Services received, related party transaction 7   12
Fundacion FEMSA, A.C. [member]      
Expenses:      
Donations to related party transactions 171 195 232
Difusion y Fomento Cultural, A.C. [member]      
Expenses:      
Donations to related party transactions 55 61 63
Donations to ITESM [member]      
Expenses:      
Donations to related party transactions 310 215 192
Grupo Financiero Scotiabank Inverlat SA [Member] | Interest Revenue [Member]      
Expenses:      
Interest expense and fee paid to related party transaction 295 447  
AdeS Alimentos y Bebidas [Member]      
Expenses:      
Purchase of goods from related party transaction $ 338 $ 497 $ 592