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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Transaction with Related Parties (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses:      
Other expenses with related parties $ 602 $ 742 $ 618
Other revenue [member]      
Income:      
Income from related party transaction 762 620 857
The Coca-Cola company [member] | Concentrate [member]      
Expenses:      
Purchase of goods from related party transaction 32,379 30,758 38,146
The Coca-Cola company [member] | Advertising [member]      
Expenses:      
Services received to related party transaction 2,193 1,392 2,354
Heineken [member]      
Income:      
Income from related party transaction 3,265 3,570 3,153
Heineken [member] | Beer [member]      
Expenses:      
Purchase of goods from related party transaction 27,999 24,942 16,436
Grupo Industrial Saltillo, S.A. de C.V. [member] | Logistic services [member]      
Income:      
Income from related party transaction 255 457 427
Jugos del Valle, S.A.P.I. de C.V. [member] | Logistic services [member]      
Income:      
Income from related party transaction 369 587 555
Jugos del Valle, S.A.P.I. de C.V. [member] | Juices [member]      
Expenses:      
Purchase of goods from related party transaction 4,537 3,905 3,310
Caffenio [member] | Coffee [member]      
Expenses:      
Purchase of goods from related party transaction   2,397 2,064
Grupo Industrial Bimbo, S.A.B. de C. V. [member] | Baked goods and snacks [member]      
Expenses:      
Purchase of goods from related party transaction 5,763 4,802 4,184
Promotora Industrial Azucarera, S.A. de C.V. [member] | Sugar [member]      
Expenses:      
Purchase of goods from related party transaction 2,604 1,885 1,765
BBVA Bancomer, S.A. de C.V. [member]      
Expenses:      
Interest expense and fee paid to related party transaction 220 40 26
Beta San Miguel [member] | Sugar [member]      
Expenses:      
Purchase of goods from related party transaction 651 1,827 1,349
Promotora Mexicana de Embotelladores, S.A. de C.V. [member] | Sugar, cans and aluminum lids [member]      
Expenses:      
Purchase of goods from related party transaction 739 839 759
Industria Envasadora De Queretaro SA De CVIEQSA [member] | Canned products [member]      
Expenses:      
Purchase of goods from related party transaction 596 804 798
Leao Alimentos e Bebidas, LTDA [member] | Inventories [member]      
Expenses:      
Purchase of goods from related party transaction 2,654 4,010 3,448
Grupo Televisa, S.A.B. de C.V. [member] | Advertising [member]      
Expenses:      
Services received to related party transaction 113 107 193
Grupo Nacional Provincial, S.A.B. [Member]      
Expenses:      
Insurance premiums for policies with Grupo Nacional Provincial, S.A.B. (3) 12 32 63
Fundacion FEMSA, A.C. [member]      
Expenses:      
Donations to related party transactions 113 23 62
Difusion y Fomento Cultural, A.C. [member]      
Expenses:      
Donations to related party transactions 63 44 $ 49
Donations to ITESM [member]      
Expenses:      
Donations to related party transactions $ 192 $ 108