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Transactions - Advances from SMM/SC (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
Reconciliation of changes in contingent liabilities recognised in business combination [abstract] |  |  |  |
Borrowings at beginning of period | $ 3,798,000,000 | $ 5,181,000,000 | $ 4,827,000,000 | $ 6,056,000,000
Cash flows |  |  |  |
Finance fees paid | 0 | 0 | 0 | 1,000,000
Changes in foreign exchange rates | 0 | (244,000,000) | 0 | 471,000,000
Borrowings at beginning of period | 3,204,000,000 | 4,162,000,000 | 3,798,000,000 | 5,181,000,000
SSM/SC | Quebrada Blanca |  |  |  |
Reconciliation of changes in contingent liabilities recognised in business combination [abstract] |  |  |  |
Borrowings at beginning of period | 0 | 0 |  |
Cash flows |  |  |  |
Borrowings at beginning of period | 702,000,000 | 912,000,000 | $ 0 | $ 0
Advances | SSM/SC | Quebrada Blanca |  |  |  |
Cash flows |  |  |  |
Advances | 708,000,000 | 946,000,000 |  |
Finance fees paid | SSM/SC | Quebrada Blanca |  |  |  |
Cash flows |  |  |  |
Finance fees paid | (6,000,000) | (8,000,000) |  |
Changes in foreign exchange rates | SSM/SC | Quebrada Blanca |  |  |  |
Cash flows |  |  |  |
Changes in foreign exchange rates | 0 | $ (26,000,000) |  |
Subordinated Loan Facility | Quebrada Blanca |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Maximum borrowing capacity | $ 1,300,000,000 |  |  |

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