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Leases - Lease Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Oct. 06, 2020
Disclosure Of Information About Lease Assets Explanatory [Line Items]      
Lease assets, beginning balance $ 1,645 $ 1,789  
Additions 88 148  
Depreciation (216) (254)  
Derecognitions   (35)  
Foreign exchange adjustments and other (9) (3)  
Lease assets, ending balance 1,508 1,645  
Lease assets 1,508 1,645  
Painted Pony Energy Ltd      
Disclosure Of Information About Lease Assets Explanatory [Line Items]      
Lease assets     $ 93
Product transportation and storage      
Disclosure Of Information About Lease Assets Explanatory [Line Items]      
Lease assets, beginning balance 1,038 1,166  
Additions 48 17  
Depreciation (110) (124)  
Derecognitions   (20)  
Foreign exchange adjustments and other (2) (1)  
Lease assets, ending balance 974 1,038  
Lease assets 974 1,038  
Field equipment and power      
Disclosure Of Information About Lease Assets Explanatory [Line Items]      
Lease assets, beginning balance 379 317  
Additions 36 121  
Depreciation (57) (53)  
Derecognitions   (5)  
Foreign exchange adjustments and other (4) (1)  
Lease assets, ending balance 354 379  
Lease assets 354 379  
Offshore vessels and equipment      
Disclosure Of Information About Lease Assets Explanatory [Line Items]      
Lease assets, beginning balance 128 182  
Additions 0 7  
Depreciation (27) (51)  
Derecognitions   (10)  
Foreign exchange adjustments and other (2) 0  
Lease assets, ending balance 99 128  
Lease assets 99 128  
Office leases and other      
Disclosure Of Information About Lease Assets Explanatory [Line Items]      
Lease assets, beginning balance 100 124  
Additions 4 3  
Depreciation (22) (26)  
Derecognitions   0  
Foreign exchange adjustments and other (1) (1)  
Lease assets, ending balance 81 100  
Lease assets $ 81 $ 100