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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Expenses:      
Other expenses with related parties $ 751 $ 618 $ 470
Other revenue [member]      
Income:      
Income from related party transaction 620 857 644
The Coca-Cola company [member]      
Expenses:      
Interest expense and fee paid to related party transaction     1
The Coca-Cola company [member] | Concentrate [member]      
Expenses:      
Purchase of goods from related party transaction 33,898 38,146 27,330
The Coca-Cola company [member] | Advertising [member]      
Expenses:      
Services received to related party transaction 1,392 2,354 1,316
Heineken [member]      
Income:      
Income from related party transaction 3,570 3,153 3,396
Heineken [member] | Raw material and beer [member]      
Expenses:      
Purchase of goods from related party transaction 24,942 16,436 14,467
Grupo Industrial Saltillo, S.A. de C.V. [member] | Logistic services [member]      
Income:      
Income from related party transaction 457 427 407
Jugos del Valle, S.A.P.I. de C.V. [member] | Logistic services [member]      
Income:      
Income from related party transaction 587 555 564
Jugos del Valle, S.A.P.I. de C.V. [member] | Juices [member]      
Expenses:      
Purchase of goods from related party transaction 3,905 3,310 3,082
Caffenio [member] | Coffee [member]      
Expenses:      
Purchase of goods from related party transaction 2,397 2,064 1,774
Grupo Industrial Bimbo, S.A.B. de C. V. [member] | Baked goods and snacks [member]      
Expenses:      
Purchase of goods from related party transaction 4,802 4,184 3,740
Promotora Industrial Azucarera, S.A. de C.V. [member] | Sugar [member]      
Expenses:      
Purchase of goods from related party transaction 1,885 1,765 1,236
BBVA Bancomer, S.A. de C.V. [member]      
Expenses:      
Interest expense and fee paid to related party transaction 40 26 68
Beta San Miguel [Member] | Sugar [member]      
Expenses:      
Purchase of goods from related party transaction 1,827 1,349 1,264
Promotora Mexicana de Embotelladores, S.A. de C.V. [member] | Sugar, cans and aluminum lids [member]      
Expenses:      
Purchase of goods from related party transaction 839 759 587
Industria Envasadora De Queretaro SA De CVIEQSA [member] | Canned products [member]      
Expenses:      
Purchase of goods from related party transaction 804 798 731
Leao Alimentos e Bebidas, LTDA [member] | Inventories [member]      
Expenses:      
Purchase of goods from related party transaction 4,010 3,448 3,359
Grupo Televisa, S.A.B. de C.V. [member] | Advertising [member]      
Expenses:      
Services received to related party transaction 107 193 175
Grupo Nacional Provincial, S.A.B. [Member]      
Expenses:      
Insurance premiums for policies with Grupo Nacional Provincial, S.A.B. 32 63 58
Fundacion FEMSA, A.C. [member]      
Expenses:      
Donations to related party transactions 23 62 30
Difusion y Fomento Cultural, A.C. [member]      
Expenses:      
Donations to related party transactions $ 44 $ 49 $ 59