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Financial Instruments - Summary of Sensitivity Analysis of Interest Rate Risks Management (Detail) - Interest rate risk [member]
$ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Interest rate swap [member] | FEMSA [member]      
Disclosure of Interest Rate Risk Exposure [Line Items]      
Change in Bps. 100 100 100
Effect on Equity $ (452) $ (550) $ (542)
Interest rate swap [member] | Coca-Cola FEMSA [member]      
Disclosure of Interest Rate Risk Exposure [Line Items]      
Change in Bps. 100    
Effect on Equity $ (234)    
Unhedged Portion Bank Loans [member]      
Disclosure of Interest Rate Risk Exposure [Line Items]      
Change in interest rate 100 100 100
Effect on profit loss $ (251) $ (354) $ (192)