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Financial Instruments and Financial Risk Management - Schedule of Effect of Change in Commodity Prices on Profit (Loss) (Details) - Commodity Price Risk $ in Millions | 12 Months Ended
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Dec. 31, 2024 CAD ($) USD_per_LB | Dec. 31, 2023 CAD ($) USD_per_LB
Disclosure of commodity price risk for financial instruments [line items] |  |
Change in Profit Attributable to Shareholders (CAD$ in millions) | $ 44 | $ 34
Copper |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Price (US$/lb.) | USD_per_LB | 3.97 | 3.87
Change in Profit Attributable to Shareholders (CAD$ in millions) | $ 52 | $ 37
Zinc |  |
Disclosure of commodity price risk for financial instruments [line items] |  |
Price (US$/lb.) | USD_per_LB | 1.34 | 1.20
Change in Profit Attributable to Shareholders (CAD$ in millions) | $ 1 | $ (1)

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- Details
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