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Other Transactions (Details)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 29, 2018
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
May 31, 2018
USD ($)
May 31, 2018
CAD ($)
Mar. 23, 2018
CAD ($)
Disclosure of Other Transactions [Line Items]              
Proceeds from disposal of assets     $ 84.0 $ 1,611.0      
Gain on sale of business     24.0 $ 602.0      
Exploration and Production              
Disclosure of Other Transactions [Line Items]              
Gain on sale of business     (91.0)        
Fenja Development Project              
Disclosure of Other Transactions [Line Items]              
Interest purchased (as a percent)         17.50% 17.50%  
Consideration paid         $ 55 $ 70.0  
Interim settlement costs           $ 22.0  
Canbriam Energy, Inc.              
Disclosure of Other Transactions [Line Items]              
Interest purchased (as a percent)             37.00%
Consideration paid             $ 52.0
Net loss related to write down of equity method investment   $ 90.0          
Remaining carrying value of company's interest   $ 0.0 $ 0.0        
Joslyn Oil Sands Mining Project              
Disclosure of Other Transactions [Line Items]              
Percentage of working interest agreed to sell 36.75%            
Gross proceeds $ 82.7            
Proceeds from disposal of assets 36.8            
Total receivable 45.9            
Long term receivable 36.7            
Current receivable $ 9.2            
Other receivable term 5 years            
Gain on sale of business $ 83.0            
Suncor With the Other Working Interest Partners | Joslyn Oil Sands Mining Project              
Disclosure of Other Transactions [Line Items]              
Percentage of working interest agreed to sell 100.00%            
Gross proceeds $ 225.0            
Proceeds from disposal of assets 100.0            
Total receivable $ 125.0