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Financial Instruments - Additional Information (Detail) $ / shares in Units, R$ in Millions, $ in Millions, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 06, 2016 | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 BRL (R$) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 128,518 |  |  |  |  | $ 137,336 |
Estimated fair value of borrowings |  | $ 251,629 |  |  |  | $ 12,812 | 259,453 | $ 167,476
Liquidity risk [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Percentage of outstanding consolidated total indebtedness at the level of its sub-holding companies |  | 64.30% | 64.30% |  | 64.50% |  |  |
Fair value [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 133,318 |  |  |  |  |  |
Options to purchase foreign currency [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Net premium paid |  | 7 |  |  |  |  |  |
Vonpar [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Date of acquisition | Dec. 06, 2016 |  |  |  |  |  |  |
Vonpar [member] | Promissory notes [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate | 0.375% |  |  |  |  |  |  |
Vonpar [member] | Spal [member] | Promissory notes [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  | Three-year |  |  |
Borrowings |  | 6,503 |  | R$ 1,090 |  |  | $ 7,022 |
Borrowings, interest rate |  |  |  | 0.375% |  |  | 0.375% |
Vonpar [member] | Purchased call options [member] | Promissory notes [member] | Fair value [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Estimated fair value of borrowings at inception of option |  | 343 |  |  |  |  |  |
Estimated fair value of borrowings |  | $ 242 |  |  |  |  | $ 368 |
Vonpar [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Percentage of out of the money |  | 30.40% | 30.40% |  | 35.90% |  |  |
Out of the money, strike price |  |  | $ 82 |  | $ 93 |  |  |
Vonpar [member] | Coca-Cola FEMSA [member] | Promissory notes [member] | Series L share [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Share strike price | $ / shares |  |  |  | R$ 178.5 |  |  |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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