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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 - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Copper |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Change in Profit Attributable to Shareholders | $ 36 | $ 14
Zinc |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Change in Profit Attributable to Shareholders | $ (2) | $ 7

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- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Pre-Tax Earnings + References No definition available. + Details
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