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Intangible Assets - Key Assumptions by CGU for Impairment Test (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]    
Impairment charge, intangibles $ 375  
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% 5.20%
Mexico [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.90%  
Expected Volume Growth Rates 2.00%  
Mexico [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.50%
Expected Volume Growth Rates   0.70%
Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 11.00% 8.90%
Post-tax WACC 7.30% 6.20%
Colombia [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 2.80%  
Expected Volume Growth Rates 4.10%  
Colombia [member] | Cash Generating Units [member] | 2020-2029 [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%
Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 15.30% 13.80%
Post-tax WACC 10.80% 9.70%
Costa Rica [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 2.70%  
Expected Volume Growth Rates 4.30%  
Costa Rica [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   2.20%
Expected Volume Growth Rates   2.10%
Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 10.60% 9.10%
Post-tax WACC 8.30% 7.10%
Guatemala [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.10%  
Expected Volume Growth Rates 6.80%  
Guatemala [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   4.00%
Expected Volume Growth Rates   8.50%
Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 20.60% 21.10%
Post-tax WACC 13.90% 12.40%
Nicaragua [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.70%  
Expected Volume Growth Rates 7.10%  
Nicaragua [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   4.40%
Expected Volume Growth Rates   3.00%
Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 8.80% 8.50%
Post-tax WACC 6.80% 6.60%
Panama [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 1.50%  
Expected Volume Growth Rates 7.90%  
Panama [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   2.00%
Expected Volume Growth Rates   5.40%
Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 26.30% 21.60%
Post-tax WACC 20.40% 14.80%
Argentina [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 30.10%  
Expected Volume Growth Rates 3.90%  
Argentina [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   39.20%
Expected Volume Growth Rates   3.70%
Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 9.10% 9.30%
Post-tax WACC 6.00% 5.60%
Brazil [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 3.00%  
Expected Volume Growth Rates 2.40%  
Brazil [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.60%
Expected Volume Growth Rates   2.00%
Uruguay [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 9.90% 9.40%
Post-tax WACC 7.10% 6.80%
Uruguay [member] | Cash Generating Units [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 7.80%  
Expected Volume Growth Rates 2.00%  
Uruguay [member] | Cash Generating Units [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   7.40%
Expected Volume Growth Rates   2.00%
South America [member] | FEMSA Comercio - Health Division [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 8.30% 9.40%
Post-tax WACC 5.80% 6.60%
South America [member] | FEMSA Comercio - Health Division [member] | 2021-2030 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 2.80%  
Expected Volume Growth Rates 0.20%  
South America [member] | FEMSA Comercio - Health Division [member] | 2020-2029 [member] | Coca-Cola FEMSA [member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term   3.00%
Expected Volume Growth Rates   0.30%
United States [member] | Cash Generating Units [member]    
Disclosure of information for cash-generating units [line items]    
Pre-tax WACC 8.20%  
Post-tax WACC 6.00%  
Impairment charge, intangibles $ 10,169  
United States [member] | Cash Generating Units [member] | 2021 - 2025 [Member]    
Disclosure of information for cash-generating units [line items]    
Expected Annual Long- Term 2.00%  
Expected Volume Growth Rates 1.70%