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Leases - Lease Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance $ 1,508 $ 1,645
Additions 182 88
Depreciation (244) (216)
Foreign exchange and other 1 (9)
Lease assets, ending balance 1,447 1,508
Product transportation and storage    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 974 1,038
Additions 44 48
Depreciation (106) (110)
Foreign exchange and other 0 (2)
Lease assets, ending balance 912 974
Field equipment and power    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 354 379
Additions 110 36
Depreciation (86) (57)
Foreign exchange and other (1) (4)
Lease assets, ending balance 377 354
Offshore vessels and equipment    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 99 128
Additions 28 0
Depreciation (31) (27)
Foreign exchange and other 1 (2)
Lease assets, ending balance 97 99
Office leases and other    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 81 100
Additions 0 4
Depreciation (21) (22)
Foreign exchange and other 1 (1)
Lease assets, ending balance $ 61 $ 81