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Subsequent Events (Details) CAD in Millions, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 20, 2018 CAD | Feb. 12, 2018 USD ($) | Feb. 07, 2018 CAD | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 12, 2018 CAD
Fort Hills Energy Limited Partnership |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  | 53.06% | 50.80% |
Syncrude |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  | 53.74% | 53.74% |
Interest in joint operations | Canbriam |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Consideration paid |  |  | CAD 52 |  |  |
Proportion of ownership interest in joint operation |  |  | 37.00% |  |  |
Interest in joint operations | Faroe Petroleum |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Consideration paid |  | $ 54.5 |  |  |  | CAD 68
Proportion of ownership interest in joint operation |  | 17.50% |  |  |  |
Additional interest in joint operations | Teck |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Consideration paid | CAD 65 |  |  |  |  |
Additional interest in joint operations | Fort Hills Energy Limited Partnership |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Interest purchased (as a percent) | 0.49% |  |  |  |  |
Additional interest in joint operations | Fort Hills Energy Limited Partnership | Teck |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Proportion of ownership interest in joint operation | 21.08% |  |  |  |  |
Additional interest in joint operations | Fort Hills Energy Limited Partnership | Total |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Proportion of ownership interest in joint operation | 25.37% |  |  |  |  |
Additional interest in joint operations | Faroe Petroleum |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Proportion of ownership interest in joint operation | 53.55% |  |  |  |  |
Additional interest in joint operations | Faroe Petroleum | Teck |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Interest purchased (as a percent) | 0.19% |  |  |  |  |
Additional interest in joint operations | Syncrude |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Consideration paid |  | $ 730.0 |  |  |  | CAD 925
Proportion of ownership interest in joint operation |  | 58.74% |  |  |  |
Interest purchased (as a percent) |  | 5.00% |  |  |  | 5.00%

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