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Financial Instruments and Financial Risk Management - Additional Information (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Risk exposure |  |  | $ (135) | $ (109)
Settlement payables | $ 6,000,000 | $ 2,000,000 |  |
Gain on debt prepayment option (Note 30(b)) | 0 | 105,000,000 |  |
Non-current derivative financial liabilities | 26,000,000 | 31,000,000 |  |
Non-current derivative financial assets |  |  | 77 | 28
Non-current derivative financial liabilities | 26,000,000 | 31,000,000 |  |
Sale and Purchase Contracts |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Current derivative financial assets | 949,000,000 | 465,000,000 |  |
Settlement payables | 61,000,000 | 16,000,000 |  |
Zinc | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non-current derivative financial liabilities | 32,000,000 | 31,000,000 |  |
Non-current derivative financial liabilities | 32,000,000 | 31,000,000 |  |
Zinc | Trade accounts payable and other liabilities | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non-current derivative financial liabilities | 6,000,000 |  |  |
Non-current derivative financial liabilities | 6,000,000 |  |  |
Zinc | Provisions and other liabilities | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non-current derivative financial liabilities | 26,000,000 |  |  |
Non-current derivative financial liabilities | 26,000,000 |  |  |
Gold | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Current derivative financial assets | $ 51,000,000 | 25,000,000 |  |
Ongoing payment percent | 15.00% |  |  |
Gold | Prepaid and other current assets | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Current derivative financial assets | $ 5,000,000 | 3,000,000 |  |
Gold | Financial and other assets | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Current derivative financial assets | 46,000,000 | 22,000,000 |  |
Silver | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non-current derivative financial liabilities | $ 33,000,000 |  |  |
Ongoing payment percent | 5.00% |  |  |
Non-current derivative financial assets |  | 6,000,000 |  |
Non-current derivative financial liabilities | $ 33,000,000 |  |  |
Silver | Prepaid and other current assets | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non-current derivative financial assets | 2,000,000 |  |  |
Silver | Financial and other assets | Embedded Derivatives |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non-current derivative financial liabilities | 31,000,000 |  |  |
Non-current derivative financial liabilities | 31,000,000 |  |  |
Swap contract |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Settlement payables | 12,000,000 |  |  |
Swap contract | Zinc |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Current derivative financial assets | 10,000,000 |  |  |
Canada, Dollars | Hedges of net investment in foreign operations |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gains (losses) on hedges of net investments in foreign operations, before tax | 128,000,000 | 193,000,000 |  |
Canada, Dollars | Borrowings | Hedges of net investment in foreign operations |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Risk exposure |  |  | $ 3,600 | $ 3,000
Currency risk | Canada, Dollars |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Reasonably possible change in risk variable, amount | 0.10 |  |  |
Impact on pre-tax earnings | (18,000,000) | (14,000,000) |  |
Reasonably possible change in risk variable, impact on other comprehensive income (loss) | (415,000,000) | (464,000,000) |  |
Interest rate risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Impact on pre-tax earnings | $ 4,000,000 | 17,000,000 |  |
Commodity Price Risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Reasonably possible change In risk variable, percent | 10.00% |  |  |
Risk exposure | $ 32,000,000 | 17,000,000 |  |
Commodity Price Risk | Zinc |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Impact on pre-tax earnings | $ (2,000,000) | $ 7,000,000 |  |
8.5% notes due June 2024 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Borrowings, interest rate |  | 8.50% |  | 8.50%

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