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Financial Instruments and Financial Risk Management - Additional Information (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Settlement payables |  |  |  | $ 2,000,000 |  | $ 6,000,000
Gain (loss) on debt prepayment option | $ 105,000,000 | $ (42,000,000) |  |  |  |
Non-current derivative financial liabilities |  |  |  | 31,000,000 |  | 39,000,000
Non-current derivative financial assets |  |  |  | 0 |  | 73,000,000
Sale and Purchase Contracts |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Current derivative financial assets |  |  |  | 465,000,000 |  | 557,000,000
Settlement payables |  |  |  | 16,000,000 |  | 45,000,000
Zinc | Embedded Derivatives |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Non-current derivative financial liabilities |  |  |  | 31,000,000 |  | 34,000,000
Gold | Embedded Derivatives |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Current derivative financial assets |  |  |  | 25,000,000 |  | 11,000,000
Ongoing payment percent | 15.00% |  |  |  |  |
Silver | Embedded Derivatives |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Non-current derivative financial liabilities |  |  |  | 6,000,000 |  |
Ongoing payment percent | 5.00% |  |  |  |  |
Non-current derivative financial assets |  |  |  |  |  | 1,000,000
Swap contract |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Settlement payables |  |  |  | 3,000,000 |  |
Swap contract | Zinc |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Settlement payables |  |  |  | 2,000,000 |  |
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 | $ 193,000,000 | 295,000,000 |  |  |  |
Canada, Dollars | Borrowings | Hedges of net investment in foreign operations |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Risk exposure |  |  | $ 3,000 |  | $ 2,600 |
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 | (1,000,000) | (8,000,000) |  |  |  |
Reasonably possible change in risk variable, impact on other comprehensive income (loss) | (464,000,000) | (408,000,000) |  |  |  |
Risk exposure |  |  | $ (3,078) |  | $ (2,683) |
Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Impact on pre-tax earnings | $ 17,000,000 | $ 15,000,000 |  |  |  |
Reasonably possible change In risk variable, percent | 1.00% | 1.00% |  |  |  |
Commodity Price Risk |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Reasonably possible change In risk variable, percent | 10.00% |  |  |  |  |
Risk exposure |  |  |  | $ 17,000,000 |  | $ 16,000,000
Commodity Price Risk | Zinc |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Impact on pre-tax earnings | $ 7,000,000 | $ 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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