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Intangible Assets - Details of Key Assumptions by CGU for Impairment Test (Detail)
Dec. 31, 2018
Dec. 31, 2017
Mexico [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 7.40% 7.30%
Post-tax WACC 5.30% 5.30%
Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 7.80% 9.10%
Post-tax WACC 5.20% 6.60%
Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 13.90% 11.50%
Post-tax WACC 9.20% 7.80%
Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 9.40% 13.90%
Post-tax WACC 7.50% 10.70%
Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 21.20% 16.60%
Post-tax WACC 11.00% 10.60%
Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 9.20% 8.30%
Post-tax WACC 7.00% 6.50%
Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 19.60% 11.00%
Post-tax WACC 11.30% 7.30%
Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 10.70% 9.70%
Post-tax WACC 6.60% 6.20%
South America [member] | FEMSA Comercio - Health Division [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 9.00% 6.90%
Post-tax WACC 6.30% 6.20%
South America [member] | FEMSA Comercio - Health Division [member] | 2017 - 2026 [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.00%
Expected Volume Growth Rates   2.00%
South America [member] | FEMSA Comercio - Health Division [member] | 2018 - 2027 [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.00%  
Expected Volume Growth Rates 0.40%  
2017 - 2026 [member] | Mexico [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.70%
Expected Volume Growth Rates   2.20%
2017 - 2026 [member] | Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.10%
Expected Volume Growth Rates   3.20%
2017 - 2026 [member] | Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.30%
Expected Volume Growth Rates   2.70%
2017 - 2026 [member] | Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   4.70%
Expected Volume Growth Rates   7.10%
2017 - 2026 [member] | Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   5.00%
Expected Volume Growth Rates   4.90%
2017 - 2026 [member] | Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   2.30%
Expected Volume Growth Rates   3.40%
2017 - 2026 [member] | Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   10.70%
Expected Volume Growth Rates   3.10%
2017 - 2026 [member] | Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   4.10%
Expected Volume Growth Rates   1.30%
2018 - 2027 [member] | Mexico [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 4.00%  
Expected Volume Growth Rates 1.40%  
2018 - 2027 [member] | Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.10%  
Expected Volume Growth Rates 4.00%  
2018 - 2027 [member] | Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 4.00%  
Expected Volume Growth Rates 1.60%  
2018 - 2027 [member] | Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.20%  
Expected Volume Growth Rates 7.30%  
2018 - 2027 [member] | Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 6.20%  
Expected Volume Growth Rates 3.80%  
2018 - 2027 [member] | Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 2.40%  
Expected Volume Growth Rates 3.00%  
2018 - 2027 [member] | Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 21.90%  
Expected Volume Growth Rates 2.70%  
2018 - 2027 [member] | Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.80%  
Expected Volume Growth Rates 1.70%