v3.26.1
Property, Plant and Equipment - Net Assets Acquired and Consideration Exchanged (Details) - CAD ($)
$ in Millions
Nov. 01, 2025
Dec. 31, 2025
Disclosure of detailed information about property, plant and equipment [line items]    
Remeasurement gain $ 4,989  
AOSP Mines and Scotford And Quest    
Disclosure of detailed information about property, plant and equipment [line items]    
Cash, net 212  
Other Working Capital, net 68  
Remeasurement gain 17  
Discount rate applied to cash flow projections   18.00%
ASOP Mines    
Disclosure of detailed information about property, plant and equipment [line items]    
Fair value of the Company's interests in the AOSP mines, net asset acquired 15,488  
Fair value of the Company's interests in the AOSP mines, purchase consideration and previously held interests (13,939)  
Fair value of the Company's interests in the AOSP mines net 1,549  
Asset retirement obligation, net assets acquired (685)  
Asset retirement obligation, purchase consideration and previously held interests 616  
Asset retirement obligation, net (69)  
Fair value, net of asset retirement obligation, net assets acquired 14,803  
Fair value, net of asset retirement obligation, purchase consideration and previously held interests 13,323  
Fair value, net of asset retirement obligation, net 1,480  
Cash, net assets acquired 153  
Other working capital, net assets acquired 8  
Lease assets, net assets acquired 1,510  
Lease assets, net 1,510  
Lease liabilities, net assets acquired (1,510)  
Lease liabilities, net (1,510)  
Deferred income tax liabilities, purchase consideration and previously held interests (268)  
Deferred income tax liability, net (268)  
Net assets acquired 14,696  
Non-cash gain $ 4,508  
Disposal of business, ownership interest 90.00%  
Scotford and Quest    
Disclosure of detailed information about property, plant and equipment [line items]    
Fair value, net of asset retirement obligation, purchase consideration and previously held interests $ 1,475  
Fair value, net of asset retirement obligation, net (1,475)  
Cash, purchase consideration and previously held interests 59  
Other working capital, purchase consideration and previously held interests 60  
Purchase consideration and previously held interests (14,679)  
Non-cash gain $ 464  
Disposal of business, ownership interest 10.00%