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Commitments - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2027 | Dec. 31, 2022 CAD ($) | Sep. 30, 2012 | Sep. 30, 2007 | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2022 USD ($)
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Purchase commitment per year |  | $ 1,200,000,000 |  |  | $ 1,200,000,000 |  |  |  |
Expected period |  |  |  |  | 1 year |  |  |  |
Royalty expense |  |  |  |  | $ 495,000,000 | $ 373,000,000 |  |  |
Purchase commitment per year |  |  |  |  |  |  |  |  | $ 234
Steelmaking Coal Operations |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Purchase commitment per year |  | 140,000,000 |  |  | $ 140,000,000 |  |  |  |
Bottom of range |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Expected period |  |  |  |  | 2 years |  |  |  |
Top of range |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Expected period |  |  |  |  | 5 years |  |  |  |
2023 |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Purchase commitment per year |  | 1,200,000,000 |  |  | $ 1,200,000,000 |  |  |  |
Within two to five years |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Purchase commitment per year |  | 24,000,000 |  |  | 24,000,000 |  |  |  |
Antamina |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Purchase commitment per year |  | 88,000,000 |  |  | $ 88,000,000 |  |  |  |
Ownership interest in joint operation |  |  |  |  | 22.50% |  |  |  |
Royalty percentage |  |  |  |  | 7.40% |  |  |  |
Royalty expense |  |  |  |  | $ 34,000,000 | 50,000,000 |  |  |
QB2 |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Purchase commitment per year |  | $ 997,000,000 |  |  | $ 997,000,000 |  |  |  |
TAK |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Royalty percentage |  | 40.00% |  | 25.00% |  |  |  |  |
Increase in net proceeds of production royalty |  |  | 5.00% |  |  |  |  |  |
Maximum royalty percentage |  |  |  |  | 50.00% |  |  |  |
Royalty expense |  |  |  |  | $ 461,000,000 | $ 323,000,000 |  |  |
TAK | Forecast |  |  |  |  |  |  |  |  |
Disclosure of commitments [line items] |  |  |  |  |  |  |  |  |
Royalty percentage | 45.00% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 42 |  |
Purchase period |  |  |  |  |  |  | 14 years |  |

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