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Intangible Assets - Details of Key Assumptions by CGU for Impairment Test (Detail) | Dec. 31, 2019 | Dec. 31, 2018
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Mexico [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 7.30% | 7.40%
Post-tax WACC | 5.20% | 5.30%
Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 8.90% | 7.80%
Post-tax WACC | 6.20% | 5.20%
Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 13.80% | 13.90%
Post-tax WACC | 9.70% | 9.20%
Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.10% | 9.40%
Post-tax WACC | 7.10% | 7.50%
Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 21.10% | 21.20%
Post-tax WACC | 12.40% | 11.00%
Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 8.50% | 9.20%
Post-tax WACC | 6.60% | 7.00%
Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 21.60% | 19.60%
Post-tax WACC | 14.80% | 11.30%
Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.30% | 10.70%
Post-tax WACC | 5.60% | 6.60%
South America [member] | FEMSA Comercio - Health Division [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.40% | 9.00%
Post-tax WACC | 6.60% | 6.30%
Expected Annual Long- Term | 3.00% | 3.00%
Expected Volume Growth Rates | 0.30% | 0.40%
Uruguay [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.40% |
Post-tax WACC | 6.80% |
2020-2029 [member] | Mexico [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Expected Annual Long- Term | 3.50% |
Expected Volume Growth Rates | 0.70% |
2020-2029 [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% |
2020-2029 [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 | 2.20% |
Expected Volume Growth Rates | 2.10% |
2020-2029 [member] | Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Expected Annual Long- Term | 4.00% |
Expected Volume Growth Rates | 8.50% |
2020-2029 [member] | Nicaragua [member] | Cash Generating Units [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% |
2020-2029 [member] | Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Expected Annual Long- Term | 2.00% |
Expected Volume Growth Rates | 5.40% |
2020-2029 [member] | Argentina [member] | Cash Generating Units [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% |
2020-2029 [member] | Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Expected Annual Long- Term | 3.60% |
Expected Volume Growth Rates | 2.00% |
2020-2029 [member] | Uruguay [member] | Cash Generating Units [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% |
2019 - 2028 [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%
2019 - 2028 [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%
2019 - 2028 [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%
2019 - 2028 [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%
2019 - 2028 [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%
2019 - 2028 [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%
2019 - 2028 [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%
2019 - 2028 [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%

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