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Financial Instruments - Additional Information (Detail) $ / shares in Units, R$ / shares in Millions, R$ in Millions, $ in Millions, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 14, 2018 BRL (R$) | Nov. 14, 2018 USD ($) | Dec. 06, 2016 MXN ($) $ / shares | Dec. 06, 2016 MXN ($) R$ / shares | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 06, 2016 BRL (R$)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Value by which call option is out of the money |  |  |  |  |  | $ 111 |  | $ 82 |  |
Vonpar [member] | Series L share [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Strike price per share | $ / shares |  |  | $ 128.88 |  |  |  |  |  |  |
Promissory notes [member] | Vonpar [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Remaining unpaid balance |  |  | $ 6,534 | $ 6,534 | $ 4,652 |  |  |  | R$ 916 | R$ 1,090
Liabilities paid | R$ 393 | $ 103 |  |  |  |  |  |  |  |
Annual rate |  |  | 0.375% | 0.375% | 0.375% |  |  |  | 0.375% | 0.375%
Maturity period |  |  | Three-year | Three-year |  |  |  |  |  |
Estimated fair value of derivative |  |  | $ 343 | $ 343 | $ 14 |  | $ 242 |  |  |
Percentage by which call option is out of the money |  |  |  |  | 49.80% | 49.80% | 30.40% | 30.40% |  |
Promissory notes [member] | Vonpar [member] | Series L share [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Strike price per share | (per share) |  |  | $ 178.5 | $ 178.5 |  |  |  |  |  |
Options to purchase foreign currency [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Premium paid for outstanding call options |  |  |  |  | $ 43 |  | $ 7 |  |  |

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