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Leases - Lease Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance $ 1,447 $ 1,508
Additions 317 182
Depreciation (273) (244)
Foreign exchange and other (33) 1
Lease assets, ending balance 1,458 1,447
Product transportation and storage    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 912 974
Additions 27 44
Depreciation (98) (106)
Foreign exchange and other (1) 0
Lease assets, ending balance 840 912
Field equipment and power    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 377 354
Additions 218 110
Depreciation (111) (86)
Foreign exchange and other (2) (1)
Lease assets, ending balance 482 377
Offshore vessels and equipment    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 97 99
Additions 49 28
Depreciation (45) (31)
Foreign exchange and other (30) 1
Lease assets, ending balance 71 97
Office leases and other    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 61 81
Additions 23 0
Depreciation (19) (21)
Foreign exchange and other 0 1
Lease assets, ending balance $ 65 $ 61