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QB2 Advances from SMM/SC -Summary of Debt Continuity (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings at beginning of period | $ 3,204 | $ 4,162 | $ 3,798 | $ 5,181
Non-cash changes |  |  |  |
Finance fees and discount amortization | (29) | (39) | 0 | 0
Changes in foreign exchange rates | 0 | (216) | 0 | (244)
Borrowings at end of period | 4,913 | 6,255 | 3,204 | 4,162
SSM/SC | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings at beginning of period | 702 | 912 | 0 | 0
Cash flows |  |  |  |
Advances | 31 | 41 | 708 | 946
Finance fees paid | 0 | 0 | (6) | (8)
Non-cash changes |  |  |  |
Finance fees and discount amortization | 1 | 1 | 0 | 0
Changes in foreign exchange rates | 0 | (20) | 0 | (26)
Borrowings at end of period | $ 734 | $ 934 | $ 702 | $ 912

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