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Equity - Dividends Declared and Paid (Detail) - MXN ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]      
Dividend declared and paid $ 10,360 $ 9,692 $ 9,220
Repurchased shares $ 0 $ 0  
Series B shares [member]      
Disclosure of classes of share capital [line items]      
Dividend declared and paid per share $ 0.51667 $ 0.48333 $ 0.45980
Series D shares [member]      
Disclosure of classes of share capital [line items]      
Dividend declared and paid per share $ 0.64583 $ 0.60417 $ 0.57480
Coca-Cola FEMSA [member]      
Disclosure of classes of share capital [line items]      
Dividend declared and paid $ 10,210 $ 7,437 $ 7,038
Top of range [member]      
Disclosure of classes of share capital [line items]      
Debt to earnings before interest, taxes, depreciation and amortization ratio 1.50%