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Intangible Assets - Details of Key Assumptions by CGU for Impairment Test (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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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 | 7.40% | 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% |

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