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Financial Instruments and Financial Risk Management - Schedule of Effect of Change in Commodity Prices on Profit (Loss) (Detail) - Commodity Price Risk $ in Millions | 12 Months Ended
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Dec. 31, 2022 CAD ($) USD_per_LB | Dec. 31, 2021 CAD ($) USD_per_LB
Copper |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Price | USD_per_LB | 3.80 | 4.42
Change in Profit Attributable to Shareholders | $ 52 | $ 53
Zinc |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Price | USD_per_LB | 1.35 | 1.62
Change in Profit Attributable to Shareholders | $ 9 | $ 7
Steelmaking coal |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Change in Profit Attributable to Shareholders | $ 9 | $ 0

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- Details
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