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Financial Instruments And Risk Management - Non Derivative Financial Instruments (Details) CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2016 CAD
Non Derivative Financial Instruments |  |
Borrowings excluding short term debt | CAD 13,443.0 | CAD 16,157.0
Partnership liability | CAD 483.0 |
East Tank Farm Development | Fort McKay First Nation and the Mikisew Cree First Nation |  |
Non Derivative Financial Instruments |  |
Percentage of ownership interest acquired | 49 |
Fixed Term Notes |  |
Non Derivative Financial Instruments |  |
Borrowings excluding short term debt | CAD 12,168.0 | 15,063.0
Fair value of fixed term debt | CAD 14,700.0 | CAD 17,500.0

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