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Intangible Assets - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 MXN ($) BasisPoint | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Mar. 28, 2017 MXN ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment recognized | $ 2,063,000,000 |  | $ 134,000,000 |
Risk premium basis points | BasisPoint | 100 |  |  |
Total carrying amount of goodwill | $ 0 |  |  |
Impairment charge on goodwill | 0 |  |  |
Vonpar [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Cash acquired | 1,287,000,000 |  |  | $ 1,287,000,000
Total carrying amount of goodwill | 2,152,000,000 |  |  |
Health Division [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Total carrying amount of goodwill | $ 6,048,000,000 |  |  |
Coca-Cola FEMSA [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Risk premium basis points | BasisPoint | 100 |  |  |
Venezuela [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment recognized | $ 2,053,000,000 |  |  |
Venezuela [member] | Coca-Cola FEMSA [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment recognized | 745,000,000 |  |  |
Other [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Borrowing costs capitalized |  | $ 8,000,000 | 28,000,000 |
Qualifying assets |  | $ 28,000,000 | $ 410,000,000 |
Effective interest rate used to determine amount of borrowing costs eligible for capitalization |  | 4.10% | 4.10% |
Intangible assets and goodwill [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Borrowing costs capitalized | $ 0 |  |  |

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