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Other Liabilities, Provisions and Contingencies - Additional Information (Detail) - MXN ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Disclosure of financial liabilities [line items]    
Provisions, other non-current liabilities and other current and non-current financial liabilities $ 32,676 $ 22,693
Aggregate amount claimed against company 54,590  
Brazil [member]    
Disclosure of financial liabilities [line items]    
Litigation amount 9,531 $ 7,739
Coca-Cola FEMSA [member]    
Disclosure of financial liabilities [line items]    
Tax contingencies amount 52,371  
Coca-Cola FEMSA [member] | ICMS [member]    
Disclosure of financial liabilities [line items]    
Tax contingencies amount 10,399  
Coca-Cola FEMSA [member] | Tax credits [member]    
Disclosure of financial liabilities [line items]    
Tax contingencies amount 34,977  
Coca-Cola FEMSA [member] | Federal taxes [member]    
Disclosure of financial liabilities [line items]    
Tax contingencies amount 3,671  
Coca-Cola FEMSA [member] | Value added tax [member]    
Disclosure of financial liabilities [line items]    
Tax contingencies amount 3,324  
Heineken [member] | Unsettled [member] | Brazil [member]    
Disclosure of financial liabilities [line items]    
Unsettled indirect tax contingencies $ 9,531