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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Income:      
Sales to affiliated parties $ 8,459 $ 6,546 $ 5,489
Expenses:      
Other expenses with related parties 0 0 156
Jugos del valle, S.A.P.I. de C.V.      
Expenses:      
Purchases and other expenses with related party 3,718 3,234 2,918
Promotora Industrial Azucarera, S.A. de C.V. ("PIASA")      
Expenses:      
Purchases and other expenses with related party 2,841 2,841 2,213
Beta San Miguel      
Expenses:      
Purchases and other expenses with related party 917 724 938
Industria Envasadora de Quertaro, S.A. de C.V. (IEQSA)      
Expenses:      
Purchases and other expenses with related party 843 577 234
Fountain Agua Mineral, LTDA      
Expenses:      
Purchases and other expenses with related party 638 0 0
Leao Alimentos e Bebidas, LTDA      
Expenses:      
Purchases and other expenses with related party 181 215 1,320
Industria Mexicana de Reciclaje, S.A. de C.V. ("IMER")      
Expenses:      
Purchases and other expenses with related party 458 504 416
Instituto Tecnologico Y de Estudios Superiores de Monterrey AC      
Expenses:      
Donations to related party 1 110 0
Fundacion FEMSA AC      
Expenses:      
Donations to related party 285 173 230
Heineken Group      
Income:      
Sales to affiliated parties 0 2 3
Expenses:      
Purchases of raw material, beer and operating expenses from Heineken 0 5,036 11,635
FEMSA      
Expenses:      
Purchases and other expenses with related party 9,547 10,129 7,447
The Coca-Cola Company      
Expenses:      
Purchases of concentrate from The Coca-Cola Company 46,461 43,717 37,213
Advertisement expense paid to The Coca-Cola Company $ 869 $ 545 $ 1,482