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Asset and Goodwill Impairment Testing - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2022 CAD ($) USD_per_Pound | Dec. 31, 2021 CAD ($) $ / bbl
Discount rate |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Change in Assumption | 1.00% | 1.00% | 1.00%
Canada, Dollars |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Long-term foreign exchange rates |  | 1.30 | 1.28
Carmen de Andacollo CGU |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Reversal of impairment loss | $ 215 |  |
Reversal of impairment loss, net | $ 150 |  |
Fort Hill Cash Generating Unit |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Post-tax real discount rates - Steelmaking Coal group of CGUs | 8.00% |  | 8.00%
Recoverable amount | $ 2,100 |  | $ 2,100
Fort Hill Cash Generating Unit | Canada, Dollars |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Long-term foreign exchange rates |  |  | 1.00
Trail |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Post-tax real discount rates - Steelmaking Coal group of CGUs |  | 5.50% |
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 |
Impairment assessment long term assumptions | USD_per_Pound |  | 277 |
Bottom of range | Steelmaking Coal Cash Generating Unit |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Useful life |  | 13 years |
Top of range | Steelmaking Coal Cash Generating Unit |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Useful life |  | 42 years |
Quebrada Blanca | QB2 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Useful life |  | 27 years |
Quebrada Blanca | Projected expansion |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Useful life |  | 40 years |
Mine Plans | Fort Hill Cash Generating Unit |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Useful life |  |  | 37 years
WCS Heavy Oil | Fort Hill Cash Generating Unit |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Future commodity price used in cash flow projections | $ / bbl |  |  | 48
Zinc | Trail |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Future commodity price used in cash flow projections | USD_per_Pound |  | 1.25 |
Zinc Premiums | Trail |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment assessment long term assumptions | USD_per_Pound |  | 0.11 |

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