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Financial Instruments - Additional Information (Detail) $ / shares in Units, R$ in Millions, $ in Millions, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 10, 2020 MXN ($) | Nov. 14, 2018 USD ($) | Nov. 14, 2018 BRL (R$) | Dec. 06, 2016 $ / shares | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 BRL (R$)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Annual rate |  |  |  |  | 5.46% |  |
Forecast [Member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Percentage Of Currency Depreciation | 30.00% |  |  |  |  |  |
Foreign Exchange Gain Loss On Currency Depreciation | $ 1,345 |  |  |  |  |  |
Promissory notes [member] | Vonpar [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Remaining unpaid balance | R$ |  |  |  |  |  |  | R$ 1,000
Liabilities paid |  | $ 103 | R$ 393 |  |  |  |
Annual rate |  |  |  | 0.375% |  |  |
Maturity period |  |  |  | three-year |  |  |
Promissory notes [member] | Vonpar [member] | Series L share [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Strike price per share | $ / shares |  |  |  | $ 178.5 |  |  |
Options to purchase foreign currency [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Premium paid for outstanding call options |  |  |  |  | $ 3 | $ 43 |

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