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Asset and Goodwill Impairment Testing - Additional Information (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) USD_per_LB | Dec. 31, 2022 CAD ($) USD_per_LB | Dec. 31, 2023 USD ($) | Jan. 01, 2022 CAD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Finite life intangibles |  | $ 345,000,000 | $ 400,000,000 |  | $ 395,000,000
Key assumptions on impairment testing, strengthening of currencies effect on recoverable amounts |  | 0.01 |  |  |
Recoverable amount exceeding carrying values |  | $ 600,000,000 |  |  |
Key assumptions on decrease in discount rate |  | 0.30% |  | 0.30% |
Zinc |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Future commodity price used in cash flow projections | USD_per_LB |  |  | 1.25 |  |
Treatment Charges |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Future commodity price used in cash flow projections | USD_per_LB |  |  | 277 |  |
Zinc Premiums |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Future commodity price used in cash flow projections | USD_per_LB |  |  | 0.11 |  |
Copper |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Future commodity price used in cash flow projections | USD_per_LB |  | 3.90 | 3.60 |  |
Key assumptions on decrease in price variable |  |  |  | $ 0.1 |
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 |  |  |
Projected expansion | Steelmaking Coal Group of CGUs |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Recoverable amount exceeding carrying values |  | 600,000,000 |  |  |
Foreign exchange rate used in cash flow projections | $ 1.38 | $ 1.33 |  |  |
Trail |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Closing foreign exchange rate | USD_per_LB |  |  | 1.30 |  |
Key assumptions on which management has based determination of fair value less costs of disposal, operating plan cash flow coverage period |  | 80 years |  |  |
Recoverable amount |  | $ 1,200,000,000 |  |  |
Post-tax real discount rates - Steelmaking Coal group of CGUs |  |  | 5.50% |  |
Quebrada Blanca |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |
Post-tax real discount rates - Steelmaking Coal group of CGUs |  | 7.00% | 6.50% | 7.00% |
Key assumptions on which management has based determination of project expansion period | 49 years |  |  |  |

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