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Financial Instruments and Financial Risk Management - Summary of Derivatives Not Designated as Hedging Instruments and Embedded Derivatives (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | $ (341) | $ 323
Swap contract | Zinc |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 15 | 17
Swap contract | Lead (pounds in millions) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 3 | 4
Settlement receivables and payables (Note 9) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (371) | 442
Embedded Derivatives | Zinc |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 27 | (28)
Embedded Derivatives | Gold |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (8) | (8)
Embedded Derivatives | Silver |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (2) | (7)
Variable consideration |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | $ (5) | $ (97)

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