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Financial Instruments - Additional Information (Detail) $ / shares in Units, R$ in Millions, $ in Millions, $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2016 | Jun. 30, 2019 MXN ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 BRL (R$) $ / shares | Jun. 30, 2019 USD ($) | [1],[2] | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 MXN ($) | Nov. 14, 2018 BRL (R$) | Nov. 14, 2018 MXN ($) | Jun. 30, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 119,394 |  |  |  |  |  |  |  | $ 126,228 |  |  |  |
Estimated fair value of borrowings |  | 300,291 | [1] |  |  |  |  | $ 15,633 |  | $ 240,839 |  |  | $ 240,839 |
Fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | 124,891 |  |  |  |  |  |  |  |  |  |  |  |
Purchased call options [member] | Promissory notes [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current prepaid expenses |  |  |  |  |  |  |  |  |  |  | R$ 393 | $ 2,079 |  |
Balance amount available |  | 4,652 |  |  |  |  |  |  | R$ 916 |  |  |  |  |
Options to purchase foreign currency [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premium paid |  | 23 |  |  | $ 43 |  |  |  |  |  |  |  |  |
Vonpar [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition | Dec. 06, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Vonpar [member] | Spal [member] | Promissory notes [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  | Three-year |  |  |  |  |  |  |
Borrowings | R$ |  |  |  |  |  |  | R$ 1,166 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 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 |  | $ 14 |  |  |  |  |  |  |  |  |  |  |  | $ 14
Vonpar [member] | Coca-Cola FEMSA [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of out of the money |  | 49.90% |  | 49.90% | 49.80% | 49.80% |  |  |  |  |  |  |  |
Out of the money, strike price |  |  |  | $ 81 |  | $ 111 |  |  |  |  |  |  |  |
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] | The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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