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Financial Instruments - Sensitivity Analysis of Market Risks (Details) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
FEMSA Entity Excluding Coca-Cola FEMSA | Currency swap contract | MXN/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate $ 0 $ 0 $ 0
Effect on profit or loss from decrease in exchange rate (163) (1,796) (2,647)
Effect on equity from increase in exchange rate 0 0 0
Effect on profit or loss from increase in exchange rate 163 1,796 2,647
FEMSA Entity Excluding Coca-Cola FEMSA | Currency swap contract | BRL/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate 0 0  
Effect on profit or loss from decrease in exchange rate (434) (34)  
Effect on equity from increase in exchange rate 0 0  
Effect on profit or loss from increase in exchange rate 434 34  
FEMSA Entity Excluding Coca-Cola FEMSA | Currency swap contract | COP/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate 0 0 0
Effect on profit or loss from decrease in exchange rate (16) (425) (354)
Effect on equity from increase in exchange rate 0 0 0
Effect on profit or loss from increase in exchange rate 16 425 354
FEMSA Entity Excluding Coca-Cola FEMSA | Currency swap contract | CLP/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate 0 0 0
Effect on profit or loss from decrease in exchange rate (2,424) (678) (996)
Effect on equity from increase in exchange rate 0 0 0
Effect on profit or loss from increase in exchange rate 2,424 678 966
FEMSA Entity Excluding Coca-Cola FEMSA | Currency swap contract | EUR/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate 0    
Effect on profit or loss from decrease in exchange rate (709)    
Effect on equity from increase in exchange rate 0    
Effect on profit or loss from increase in exchange rate 709    
FEMSA Entity Excluding Coca-Cola FEMSA | Currency swap contract | USD/BRL      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate     0
Effect on profit or loss from decrease in exchange rate     (18)
Effect on equity from increase in exchange rate     0
Effect on profit or loss from increase in exchange rate     18
FEMSA Entity Excluding Coca-Cola FEMSA | Net Cash In Foreign Currency | EUR/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit or loss from decrease in exchange rate (14,855) (14,617) (1,779)
Effect on profit or loss from increase in exchange rate 14,855 14,617 1,779
Coca-Cola FEMSA | Currency swap contract | MXN/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (1,863) (1,314) (1,220)
Effect on profit or loss from decrease in exchange rate 0 0 0
Effect on equity from increase in exchange rate 1,863 1,314 1,220
Effect on profit or loss from increase in exchange rate 0 0 0
Coca-Cola FEMSA | Currency swap contract | BRL/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (2,187) (1,683) (2,893)
Effect on profit or loss from decrease in exchange rate 0 0 0
Effect on equity from increase in exchange rate 2,187 1,683 2,893
Effect on profit or loss from increase in exchange rate 0 0 0
Coca-Cola FEMSA | Currency swap contract | EUR/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate   0 0
Effect on profit or loss from decrease in exchange rate   (742) (1,315)
Effect on equity from increase in exchange rate   0 0
Effect on profit or loss from increase in exchange rate   742 1,315
Coca-Cola FEMSA | Currency swap contract | EUR/MXN      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate     0
Effect on profit or loss from decrease in exchange rate     (902)
Effect on profit or loss from increase in exchange rate     902
Coca-Cola FEMSA | Net Cash In Foreign Currency | U.S. dollars      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on profit or loss from decrease in exchange rate (1,397) (1,797) (2,282)
Effect on profit or loss from increase in exchange rate 1,397 1,797 2,282
Commodity price risk | Coca-Cola FEMSA | Commodity price contracts | Sugar Price Contracts      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from change in commodity price (1,578) (765) (333)
Commodity price risk | Coca-Cola FEMSA | Commodity price contracts | Aluminum price contracts      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from change in commodity price (189) (2,812) (4,520)
Currency risk | FEMSA Entity Excluding Coca-Cola FEMSA | Forward contract | MXN/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (15) (9) (6)
Effect on equity from increase in exchange rate 15 9 6
Currency risk | FEMSA Entity Excluding Coca-Cola FEMSA | Forward contract | MXN/EUR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate     (1)
Effect on equity from increase in exchange rate     1
Currency risk | FEMSA Entity Excluding Coca-Cola FEMSA | Forward contract | CHF/EUR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (125) (78) (44)
Effect on equity from increase in exchange rate 125 78 44
Currency risk | FEMSA Entity Excluding Coca-Cola FEMSA | Forward contract | EUR/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (7) 6  
Effect on equity from increase in exchange rate 7 (6)  
Currency risk | Coca-Cola FEMSA | Forward contract | MXN/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (183) (465) (512)
Effect on equity from increase in exchange rate 183 465 512
Currency risk | Coca-Cola FEMSA | Forward contract | BRL/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (50) (521) (550)
Effect on equity from increase in exchange rate 50 521 550
Currency risk | Coca-Cola FEMSA | Forward contract | COP/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (34) (225) (112)
Effect on equity from increase in exchange rate 34 225 112
Currency risk | Coca-Cola FEMSA | Forward contract | ARS/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (11) (685) (10)
Effect on equity from increase in exchange rate 11 685 10
Currency risk | Coca-Cola FEMSA | Forward contract | UYU/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (13) (20) (25)
Effect on equity from increase in exchange rate 13 20 25
Currency risk | Coca-Cola FEMSA | Forward contract | CRC/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity from decrease in exchange rate (14) (15) (24)
Effect on equity from increase in exchange rate 14 15 24
Currency risk | Coca-Cola FEMSA | Options To Purchase Foreign Currency | MXN/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity to purchase foreign currency (136) 0 (4,520)
Currency risk | Coca-Cola FEMSA | Options To Purchase Foreign Currency | BRL/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity to purchase foreign currency (119) 0 0
Currency risk | Coca-Cola FEMSA | Options To Purchase Foreign Currency | COP/USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Effect on equity to purchase foreign currency $ (54) $ 0 $ 0