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Leases - Lease Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance $ 1,458 $ 1,447
Additions 231 317
Depreciation (302) (273)
Foreign exchange adjustments and other 7 (33)
Lease assets, ending balance 1,394 1,458
Product transportation and storage    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 840 912
Additions 5 27
Depreciation (96) (98)
Foreign exchange adjustments and other 3 (1)
Lease assets, ending balance 752 840
Field equipment and power    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 482 377
Additions 118 218
Depreciation (135) (111)
Foreign exchange adjustments and other 3 (2)
Lease assets, ending balance 468 482
Offshore vessels and equipment    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 71 97
Additions 40 49
Depreciation (51) (45)
Foreign exchange adjustments and other 4 (30)
Lease assets, ending balance 64 71
Office leases and other    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 65 61
Additions 68 23
Depreciation (20) (19)
Foreign exchange adjustments and other (3) 0
Lease assets, ending balance $ 110 $ 65