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Asset and Goodwill Impairment Testing (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2024 USD ($) | Sep. 30, 2024 CAD ($) | Dec. 31, 2024 CAD ($) USD_per_LB | Dec. 31, 2023 CAD ($) USD_per_LB | Dec. 31, 2024 USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Asset impairment |  |  | $ 1,053,000,000 | $ 0 |
Recoverable amount exceeding carrying values | $ 1,800,000,000 |  |  |  |
Key assumptions on decrease in discount rate |  |  |  |  | 1.10%
Key assumptions on impairment testing, strengthening of currencies effect on recoverable amounts |  |  |  | $ 0.01 |
Discount rate used in current estimate of value in use |  | 5.50% |  |  |
Copper |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Key assumptions on decrease in price variable |  |  |  |  | $ 0.38
Future commodity price used in cash flow projections | USD_per_LB |  |  | 4.20 | 3.90 |
Trail CGU |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Asset impairment |  | $ 1,100,000,000 |  |  |
Impairment loss recognised in profit or loss, after tax |  | 828,000,000 |  |  |
Recoverable amount |  | $ 666,000,000 |  |  |
Quebrada Blanca |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Key assumptions on which management has based determination of project expansion period | 47 years |  |  |  |
Discount rate applied to cash flow projections |  |  |  | 7.00% | 7.00%
Level 3 |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Recoverable amount exceeding carrying values |  |  |  | $ 80,000,000 |
Steelmaking Coal Group of CGUs |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Foreign exchange rate used in cash flow projections |  |  |  | $ 1.32 |

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