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Intangible Assets - Details of Key Assumptions by CGU for Impairment Test (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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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% | 6.80%
Post-tax WACC | 5.30% | 6.30%
Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.10% | 7.90%
Post-tax WACC | 6.60% | 7.50%
Venezuela [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC |  | 17.50%
Post-tax WACC |  | 17.00%
Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 11.50% | 8.40%
Post-tax WACC | 7.80% | 8.30%
Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 13.90% | 9.90%
Post-tax WACC | 10.70% | 9.50%
Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 16.60% | 10.60%
Post-tax WACC | 10.60% | 10.10%
Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 8.30% | 7.80%
Post-tax WACC | 6.50% | 7.40%
Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 11.00% | 9.10%
Post-tax WACC | 7.30% | 8.50%
Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.70% | 8.70%
Post-tax WACC | 6.20% | 8.10%
South America [member] | Health Division [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 6.90% | 7.50%
Post-tax WACC | 6.20% | 7.30%
South America [member] | 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 |  | 13.00%
South America [member] | 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 | 2.00% |
Philippines [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Pre-tax WACC | 9.70% |
Post-tax WACC | 5.90% |
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 |  | 1.20%
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 |  | 3.20%
Expected Volume Growth Rates |  | 4.00%
2017 - 2026 [member] | Venezuela [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Expected Annual Long- Term |  | 117.30%
Expected Volume Growth Rates |  | 1.00%
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 |  | 4.40%
Expected Volume Growth Rates |  | 4.70%
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 |  | 5.00%
Expected Volume Growth Rates |  | 13.20%
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 |  | 4.20%
Expected Volume Growth Rates |  | 5.70%
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 |  | 3.00%
Expected Volume Growth Rates |  | 4.90%
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 |  | 12.20%
Expected Volume Growth Rates |  | 4.10%
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 |  | 4.40%
Expected Volume Growth Rates |  | 2.90%
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 | 3.70% |
Expected Volume Growth Rates | 2.20% |
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 | 3.20% |
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 | 3.30% |
Expected Volume Growth Rates | 2.70% |
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 | 4.70% |
Expected Volume Growth Rates | 7.10% |
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 | 5.00% |
Expected Volume Growth Rates | 4.90% |
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 | 2.30% |
Expected Volume Growth Rates | 3.40% |
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 | 10.70% |
Expected Volume Growth Rates | 3.10% |
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 | 4.10% |
Expected Volume Growth Rates | 1.30% |
2018 - 2027 [member] | Philippines [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 | 3.40% |

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