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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