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Fort Hills (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 21, 2017
Disclosure of joint operations |  |  |  |
Risk adjusted discount rate |  | 8.00% | 8.00% |
Teck Resources Limited |  |  |  |
Disclosure of joint operations |  |  |  |
Consideration paid | $ 145 |  |  |
Total |  |  |  |
Disclosure of joint operations |  |  |  |
Interest (as a percent) | 24.58% |  |  |
Minimum |  |  |  |
Disclosure of joint operations |  |  |  |
Risk adjusted discount rate |  | 10.00% | 10.00% |
Maximum |  |  |  |
Disclosure of joint operations |  |  |  |
Risk adjusted discount rate |  | 12.00% | 12.00% |
Fort Hills oil sands project |  |  |  |
Disclosure of joint operations |  |  |  |
Interest purchased (as a percent) |  |  |  | 2.26%
Consideration paid |  |  |  | $ 308
Fort Hills Energy Limited Partnership |  |  |  |
Disclosure of joint operations |  |  |  |
Interest purchased (as a percent) | 1.05% |  |  |
Interest (as a percent) |  | 54.11% | 53.06% |
Fort Hills Energy Limited Partnership | Teck Resources Limited |  |  |  |
Disclosure of joint operations |  |  |  |
Interest (as a percent) | 21.31% |  |  |
Faroe Petroleum |  |  |  |
Disclosure of joint operations |  |  |  |
Interest (as a percent) | 54.11% |  |  |

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