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Other long-term liabilities (Details)
$ in Millions, $ in Millions
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2009
USD ($)
agreement
Other long term liabilities      
Pensions and other post-retirement benefits $ 1,420 $ 1,369  
Share-based compensation plans 259 361  
Partnership liability 470 483  
Deferred revenue 46 49  
Libya Exploration and Production Sharing Agreement (EPSA) signature bonus(1) 83 77  
Other 68 73  
Other long term liabilities 2,346 2,412  
Petro Canada      
Other long term liabilities      
Number of EPSA's agreement ratified | agreement     6
Signature bonus 85 79 $ 500
Signature bonus current $ 2 $ 2