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QB2 Advances from SMM/SC - Summary of Amounts Outstanding (Details) $ in Millions, $ in Millions | 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 |  | $ 6,255 |  | $ 4,162
Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 4,977 |  | $ 3,232 |
Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 7,291 |  | 4,643
Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 1,150 | 1,423 |  | 0
Quebrada Blanca Phase 2 project facility | SSM/SC |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 934 |  | 912
Quebrada Blanca Phase 2 project facility | Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 1,147 |  | 0 |
Quebrada Blanca Phase 2 project facility | Face Value | SSM/SC |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 739 |  | $ 708 |
Quebrada Blanca Phase 2 project facility | Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,459 |  | 0
Quebrada Blanca Phase 2 project facility | Fair Value | SSM/SC |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 941 |  | $ 912

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