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Non-Operating Income (Expense) - Additional Information (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 CAD ($) USD_per_LB | Dec. 31, 2020 CAD ($) | Dec. 31, 2021 USD ($) USD_per_LB | Dec. 31, 2018
ENAMI |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Gains (losses) on change in fair value of derivatives | $ (44) | $ 56 |  |
Financial liabilities at amortised cost | 78 | 30 |  |
Inversiones Mineras S.A. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Gains (losses) on change in fair value of derivatives | $ 97 | 0 |  |
Proportion of additional interests acquired (as a percent) |  |  |  | 13.50%
Derivative liability, contractual amount (in usd per lb) | USD_per_LB | 3.15 |  | 3.15 |
Derivative contractual period | 3 years |  |  |
Maximum exposure to credit risk of financial assets designated as measured at fair value through profit or loss |  |  | $ 100 |
Amount by which credit derivatives or similar instruments related to financial assets designated as measured at fair value through profit or loss mitigate maximum exposure to credit risk | $ 98 | $ 0 |  |

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