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Financial Instruments - Additional Information (Detail) $ / shares in Units, R$ in Millions, $ in Millions, $ in Millions |  |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 14, 2018 USD ($) | Nov. 14, 2018 BRL (R$) | Dec. 06, 2016 MXN ($) | Dec. 06, 2016 BRL (R$) | Sep. 30, 2020 | Dec. 31, 2020 MXN ($) $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 BRL (R$)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Promissory note term |  |  |  |  |  | 3 years | 3 years |  |
Purchase price paid | R$ |  |  |  | R$ 1,166 |  |  |  |  |
Liabilities paid |  |  |  |  |  |  | $ 500 |  |
Annual rate |  |  |  |  |  | 5.46% |  | 5.46% |
Maturity notes |  |  | $ 4,676 |  |  |  |  |  |
Joint venture stock interest sold percentage |  |  |  |  | 100.00% |  |  |  |
Financial assets |  |  |  |  |  | $ 8 |  | $ 8 |
Options to purchase foreign currency |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Premium paid for outstanding call options |  |  |  |  |  | $ 3 |  |  |
Promissory notes | Vonpar |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Liabilities paid | $ 103 | R$ 393 |  |  |  |  |  |  |
Remaining unpaid balance | R$ |  |  |  | R$ 1,000 |  |  |  |  | R$ 1,000
Annual rate |  |  |  |  |  | 0.375% |  | 0.375% |
Promissory notes | Vonpar | Series L shares, without par value |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Strike price per share | $ / shares |  |  |  |  |  | $ 178.5 |  |  |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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