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Summary of Significant Accounting Policies - Additional Information (Detail) - CAD CAD in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017
Disclosure of significant accounting policies [line items] |  |
Percentage interest in other entities |  | 0.00%
Galore Creek Partnership [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 50.00%
Fort Hills Energy Limited Partnership [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 20.89%
Consideration for increased portion of ownership interest |  | CAD 120
Fort Hills Energy Limited Partnership [member] | Major purchases of assets [member] |  |
Disclosure of significant accounting policies [line items] |  |
Consideration for increased portion of ownership interest | CAD 25 |
Percentage increase in ownership of joint operation | 0.19% |
Waneta Dam [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 66.70%
Antamina [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 22.50%
Nueva Union [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 50.00%
Bottom of range [member] | Fort Hills Energy Limited Partnership [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 20.00%
Top of range [member] | Fort Hills Energy Limited Partnership [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation |  | 20.89%
Top of range [member] | Fort Hills Energy Limited Partnership [member] | Major purchases of assets [member] |  |
Disclosure of significant accounting policies [line items] |  |
Ownership interest in joint operation | 21.08% |

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