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Other Liabilities, Provisions, Contingencies and Commitments - Additional Information (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial liabilities [line items]      
Aggregate amount claimed against company $ 70,830    
Rental expense 9,468 $ 8,202 $ 6,088
Brazil [member]      
Disclosure of financial liabilities [line items]      
Litigation amount 9,433 $ 8,093 $ 3,569
Coca-Cola FEMSA [member]      
Disclosure of financial liabilities [line items]      
Tax contingencies amount 51,014    
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 $ 6,272