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Commitments - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2007 | Dec. 31, 2022 | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | $ 1,330,000,000 |  |  |  |
Royalty expense |  |  |  | 373,000,000 |  | $ 266,000,000 |  |
2022 |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | 1,270,000,000 |  |  |  |
Within two to five years |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | 62,000,000 |  |  |  |
Antamina |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | $ 113,000,000 |  |  |  |
Ownership interest in joint operation |  |  |  | 22.50% | 22.50% |  |  |
Royalty percentage |  |  |  | 7.40% | 7.40% |  |  |
Royalty expense |  |  |  | $ 50,000,000 |  | 27,000,000 |  |
Steelmaking Coal Operations |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | 67,000,000 |  |  |  |
QB2 |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | 1,100,000,000 |  |  |  |
TAK |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Royalty percentage | 35.00% | 25.00% |  |  |  |  |  |
Increase in net proceeds of production royalty | 5.00% |  |  |  |  |  |  |
Maximum royalty percentage | 50.00% |  |  |  |  |  |  |
Royalty expense |  |  |  |  | $ 255 |  | $ 175 |
TAK | Forecast |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Royalty percentage |  |  | 40.00% |  |  |  |  |
Quebrada Blanca |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  | $ 277,000,000 |  |  |  |
Purchase period |  |  |  | 18 years | 18 years |  |  |
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%
Carmen de Andacollo |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |
Purchase commitment per year |  |  |  |  |  | $ 52,000,000 |  |
Purchase period |  |  |  |  |  | 14 years | 14 years |

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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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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