v3.26.1
Supplemental Disclosure of Cash Flow Information - Liabilities Arising from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 20,283 $ 12,354  
Changes from financing cash flows:      
(Repayment) issuance of bank credit facilities and commercial paper, net (1,395) 5,466 $ 0
Issuance of other long-term debt 1,634 2,639 0
Repayment of other long-term debt (1,699) (1,008) (416)
Payment of lease liabilities (361) (325) (285)
Non-cash changes:      
Changes in foreign exchange and fair value (733) 926  
Liabilities arising from financing activities, ending balance 19,723 20,283 12,354
Long-term debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 18,819 10,799  
Changes from financing cash flows:      
(Repayment) issuance of bank credit facilities and commercial paper, net (1,395) 5,466  
Issuance of other long-term debt 1,634 2,639  
Repayment of other long-term debt (1,699) (1,008)  
Non-cash changes:      
Changes in foreign exchange and fair value (742) 923  
Liabilities arising from financing activities, ending balance 16,617 18,819 10,799
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 1,464 1,555  
Changes from financing cash flows:      
Payment of lease liabilities (361) (325)  
Non-cash changes:      
Lease additions 2,055 231  
Changes in foreign exchange and fair value 9 3  
Lease derecognitions (61)    
Liabilities arising from financing activities, ending balance $ 3,106 $ 1,464 $ 1,555