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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Transactions and Other Related Parties (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income:      
Sales to affiliated parties $ 5,020 $ 5,694 $ 5,200
Expenses:      
Other expenses with related parties 10 15 79
Jugos del Valle, S.A.P.I. de C.V.      
Expenses:      
Purchases and other expenses of coca cola FEMSA 2,437 2,863 2,872
Promotora Industrial Azucarera, S.A. de C.V. ("PIASA")      
Expenses:      
Purchases and other expenses of coca cola FEMSA 2,123 2,728 2,604
Beta San Miguel      
Expenses:      
Purchases and other expenses of coca cola FEMSA 1,023 655 651
Industria Envasadora de Quertaro, S.A. de C.V. (IEQSA)      
Expenses:      
Purchases and other expenses of coca cola FEMSA 226 682 596
Leao Alimentos e Bebidas, LTDA      
Expenses:      
Purchases and other expenses of coca cola FEMSA 1,253 1,867 2,654
Industria Mexicana de Reciclaje, S.A. de C.V. ("IMER")      
Expenses:      
Purchases and other expenses of coca cola FEMSA 308 281 298
Instituto Tecnologico Y de Estudios Superiores de Monterrey AC      
Expenses:      
Donations to related party 225 127 127
Fundacion FEMSA AC      
Expenses:      
Donations to related party 114 146 179
BBVA Bancomer SA de CV      
Income:      
Interest income received from BBVA Bancomer, S.A. de C.V. 80 30 180
Expenses:      
Interest and fees paid to Bancomer 153 98 168
Heineken Group      
Income:      
Sales to affiliated parties 3 5 4
Expenses:      
Purchases of raw material, beer and operating expenses from Heineken 11,600 12,755 14,959
FEMSA      
Expenses:      
Purchases and other expenses of coca cola FEMSA 6,538 7,756 8,878
The Coca-Cola Company      
Expenses:      
Purchases of concentrate from The Coca-Cola Company 32,222 34,063 32,379
Advertisement expense paid to The Coca-Cola Company 865 1,756 2,193
AdeS      
Expenses:      
Purchases and other expenses of coca cola FEMSA $ 338 $ 497 $ 592