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Other Liabilities, Provisions, Contingencies and Commitments - Additional Information (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]      
Aggregate amount claimed against company $ 57,446    
Rental expense 10,621 $ 9,468 $ 8,202
Brazil [member]      
Disclosure of financial liabilities [line items]      
Litigation amount 7,739 $ 9,433 $ 8,093
Coca-Cola FEMSA [member]      
Disclosure of financial liabilities [line items]      
Tax contingencies amount 51,104    
Coca-Cola FEMSA [member] | ICMS [member]      
Disclosure of financial liabilities [line items]      
Tax contingencies amount 12,346    
Coca-Cola FEMSA [member] | Tax credits [member]      
Disclosure of financial liabilities [line items]      
Tax contingencies amount 33,217    
Coca-Cola FEMSA [member] | Federal taxes [member]      
Disclosure of financial liabilities [line items]      
Tax contingencies amount 4,787    
Coca-Cola FEMSA [member] | Value added tax [member]      
Disclosure of financial liabilities [line items]      
Tax contingencies amount 664    
Heineken [member] | Unsettled [member] | Brazil [member]      
Disclosure of financial liabilities [line items]      
Unsettled indirect tax contingencies $ 4,113