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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, 2019 CAD ($) USD_per_Pound | Dec. 31, 2018 CAD ($) USD_per_Pound
Copper |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
US$/lb. | USD_per_Pound | 2.80 | 2.70
Change in Profit Attributable to Shareholders | $ | $ 14 | $ 21
Zinc |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
US$/lb. | USD_per_Pound | 1.04 | 1.12
Change in Profit Attributable to Shareholders | $ | $ 7 | $ 7

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- Details
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