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Non-Controlling Interests - Summary of Information About Subsidiaries with Non-controlling Interests and Non-controlling Interest Balances (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Disclosure of subsidiaries [line items] |  |  |
Non controlling interests | $ 134 | $ 142 | $ 159
Carmen de Andacollo [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | Region IV, Chile |  |
Ownership ng Rights Held ingInterest | 10.00% |  |
Non controlling interests | $ 32 | 34 |
Quebrada Blanca [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | Region I, Chile |  |
Ownership ng Rights Held ingInterest | 10.00% |  |
Non controlling interests | $ 10 | 30 |
Elkview Mine Limited Partnership [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | British Columbia, Canada |  |
Ownership ng Rights Held ingInterest | 5.00% |  |
Non controlling interests | $ 59 | 53 |
Compania Minera Zafranal S.A.C. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of Interest and Voti Principal Place of Business by Non-Controll | Arequipa Region, Peru |  |
Ownership ng Rights Held ingInterest | 20.00% |  |
Non controlling interests | $ 33 | $ 25 |

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