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Transactions - Purchase of Quebrada Blanca (Details) $ in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 18, 2019 USD ($) | Dec. 31, 2018 USD ($) USD_per_Pound | Dec. 31, 2018 CAD ($) USD_per_Pound | Dec. 31, 2017 | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Contingent liabilities recognised in business combination |  |  |  |  | $ 58 | $ 58
Quebrada Blanca |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 13.50% |  |  |  | 13.50%
Proportion of ownership interest in subsidiary |  | 90.00% | 90.00% | 76.50% |  |
Contingent consideration | $ 60 | $ 53 | $ 67 |  |  |
Contingent consideration, applicable term |  | 3 years | 3 years |  |  |
Increase (decrease) in equity |  |  | $ 175 |  |  |
Commencement of commercial production | Quebrada Blanca |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Contingent liabilities recognised in business combination |  | $ 50 |  |  |  |
Contingent consideration, applicable term |  | 30 days | 30 days |  |  |
Copper Price | Quebrada Blanca |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Contingent consideration |  | $ 100 |  |  |  |
Commodity price | USD_per_Pound |  | 3.15 | 3.15 |  |  |
Non-controlling interests | Quebrada Blanca |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Increase (decrease) in equity |  |  | $ 16 |  |  |
Equity attributable to owners of parent | Quebrada Blanca |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Increase (decrease) in equity |  |  | $ 159 |  |  |

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