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Financial Instruments and Financial Risk Management - Schedule of Effect of Change in Commodity Prices on Profit (Loss) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2021 CAD ($) USD_per_LB | Dec. 31, 2020 CAD ($) USD_per_LB
Copper | Commodity Price Risk |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
US$/lb. | USD_per_LB | 4.42 | 3.52
Change in Profit Attributable to Shareholders | $ | $ 53 | $ 36
Zinc |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
US$/lb. | USD_per_LB | 1.62 | 1.24
Zinc | Commodity Price Risk |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Change in Profit Attributable to Shareholders | $ | $ 7 | $ (2)

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