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East Tank Farm Development (ETFD) (Details) - East Tank Farm Development - CAD CAD in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 22, 2017 | Dec. 31, 2017
EAST TANK FARM DEVELOPMENT PARTNERSHIP (ETFD) |  |
Gross proceeds | CAD 503.0 |
Ownership interest (as percent) | 51.00% |
Distributions to partners |  | CAD 25.0
Allocated to interest expense |  | 5.0
Allocated to principal |  | CAD 20.0
Fort McKay First Nation and the Mikisew Cree First Nation |  |
EAST TANK FARM DEVELOPMENT PARTNERSHIP (ETFD) |  |
Ownership interest sold | 49.00% |

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