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Acquisitions - Sunrise Oil Sands Partnership Narrative (Details)
$ in Millions
 8 Months Ended 12 Months Ended
Aug. 31, 2022
CAD ($)
$ / bbl
Jun. 13, 2022
CAD ($)
Aug. 31, 2022
CAD ($)
$ / bbl
Aug. 30, 2022
Dec. 31, 2022
CAD ($)
Disclosure of detailed information about business combination [line items]          
Revenue of acquiree since acquisition date         $ 599.0
Profit (loss) of acquiree since acquisition date         0.0
Revenue of combined entity as if combination occurred at beginning of period         67,800.0
Profit (loss) of combined entity as if combination occurred at beginning of period         6,600.0
Sunrise Oil Sands Partnership          
Disclosure of detailed information about business combination [line items]          
Proportion of ownership interest in joint operation   35.00%   50.00%  
Sunrise Oil Sands Partnership          
Disclosure of detailed information about business combination [line items]          
Agreement to purchase remaining ownership 50.00%        
Measurement period adjustments recognised for particular assets, liabilities, non-controlling interests or items of consideration         26.0
Fair value of accounts receivable and accrued revenues recognised as of acquisition date $ 164.0   $ 164.0    
Gross cash transferred in acquisition 600.0   600.0    
Initial Recognition $ 600.0 $ 600.0 600.0    
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination     $ 40.0    
Contingent consideration, price per barrel (in dollars per share) | $ / bbl 52.00   52.00    
Contingent consideration, quarterly payment $ 2.8   $ 2.8    
Initial Recognition 600.0   600.0    
Investment in Equity-Accounted Affiliates 1,559.0   1,559.0    
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date $ 960.0   $ 960.0    
Non-cash revaluation gain, before tax         599.0
Non-cash revaluation gain, after tax         $ 457.0
Sunrise Oil Sands Partnership | Bottom of range          
Disclosure of detailed information about business combination [line items]          
Contingent consideration, price per barrel (in dollars per share) | $ / bbl 52.00   52.00    
Sunrise Oil Sands Partnership | Top of range          
Disclosure of detailed information about business combination [line items]          
Contingent consideration, price per barrel (in dollars per share) | $ / bbl 53.00   53.00