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v3.19.3.a.u2

Summary of Significant Accounting Policies - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
NuevaUnión |  |  |
Disclosure of joint ventures [line items] |  |  |
Ownership interest in joint venture |  | 50.00% |
Galore Creek Partnership |  |  |
Disclosure of joint ventures [line items] |  |  |
Ownership interest in joint operation |  | 50.00% |
Fort Hills Energy Limited Partnership |  |  |
Disclosure of joint ventures [line items] |  |  |
Ownership interest in joint operation |  | 21.30% |
Consideration for increased portion of ownership interest |  |  | $ 58
Fort Hills Energy Limited Partnership | Bottom of range |  |  |
Disclosure of joint ventures [line items] |  |  |
Ownership interest in joint operation |  |  | 20.89%
Fort Hills Energy Limited Partnership | Top of range |  |  |
Disclosure of joint ventures [line items] |  |  |
Ownership interest in joint operation |  |  | 21.30%
Antamina |  |  |
Disclosure of joint ventures [line items] |  |  |
Ownership interest in joint operation | 22.50% | 22.50% |

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