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Commitments - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2008 | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | $ 1,760,000,000 |  |  |  |  |
Expected period |  | 1 year | 1 year |  |  |  |
Royalty expense |  | $ 266,000,000 |  | $ 343,000,000 |  |  |
2021 |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | 1,530,000,000 |  |  |  |  |
Within two to five years |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | 230,000,000 |  |  |  |  |
Antamina |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | $ 127,000,000 |  |  |  |  |
Ownership interest in joint operation |  | 22.50% | 22.50% |  |  |  |
Royalty percentage |  | 7.40% | 7.40% |  |  |  |
Royalty expense |  | $ 27,000,000 |  | $ 16,000,000 |  |  |
Steelmaking Coal Operations |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | 52,000,000 |  |  |  |  |
QB2 |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | $ 1,580,000,000 |  |  |  |  |
TAK |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Royalty percentage | 25.00% |  |  |  |  |  | 35.00%
Increase in net proceeds of production royalty |  | 5.00% | 5.00% |  |  |  |
Maximum royalty percentage |  | 50.00% | 50.00% |  |  |  |
Royalty expense |  |  | $ 175 |  | $ 231 |  |
TML |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |
Purchase commitment per year |  | $ 75,000,000 |  |  |  |  |
Purchase period |  |  |  |  |  | 20 years |
Optional purchase period extension |  |  |  |  |  | 10 years |
Purchase commitment percentage increase per year |  | 2.00% | 2.00% |  |  |  |

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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