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Financial Instruments And Risk Management - Non Derivative Financial Instruments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Non Derivative Financial Instruments |  |
Partnership liability | $ 477 | $ 483
East Tank Farm Development | Fort McKay First Nation and the Mikisew Cree First Nation Partnership |  |
Non Derivative Financial Instruments |  |
Percentage of ownership interest acquired | 49 |
Fixed Term Notes |  |
Non Derivative Financial Instruments |  |
Borrowings excluding short term debt | $ 12,900 | 12,168
Fair value of fixed term debt | $ 14,200 | $ 14,700

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