v3.26.1
Leases - Lease Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance $ 1,394 $ 1,458
Additions 2,055 231
Depreciation (362) (302)
Derecognitions (61)  
Foreign exchange adjustments and other (25) 7
Lease assets, ending balance 3,001 1,394
Corridor Pipeline, Sole Contracted Shipper    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Additions 1,510  
Product transportation and storage    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 752 840
Additions 1,554 5
Depreciation (100) (96)
Derecognitions (3)  
Foreign exchange adjustments and other (4) 3
Lease assets, ending balance 2,199 752
Field equipment and power    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 468 482
Additions 413 118
Depreciation (208) (135)
Derecognitions (29)  
Foreign exchange adjustments and other (10) 3
Lease assets, ending balance 634 468
Offshore vessels and equipment    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 64 71
Additions 45 40
Depreciation (30) (51)
Derecognitions (29)  
Foreign exchange adjustments and other (7) 4
Lease assets, ending balance 43 64
Office leases and other    
Disclosure Of Information About Lease Assets Explanatory [Line Items]    
Lease assets, beginning balance 110 65
Additions 43 68
Depreciation (24) (20)
Derecognitions 0  
Foreign exchange adjustments and other (4) (3)
Lease assets, ending balance $ 125 $ 110