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Supplemental Disclosure of Cash Flow Information - Liabilities Arising from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 12,354 $ 12,985  
Changes from financing cash flows:      
Issuance (repayment) of bank credit facilities and commercial paper, net 5,466 0 $ (1,156)
Issuance of other long-term debt 2,639 0 0
Repayment of other long-term debt (1,008) (416) (2,854)
Payment of lease liabilities (325) (285) (232)
Non-cash changes:      
Lease additions 231 317  
Changes in foreign exchange and fair value 926 (247)  
Liabilities arising from financing activities, ending balance 20,283 12,354 12,985
Long-term debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 10,799 11,445  
Changes from financing cash flows:      
Issuance (repayment) of bank credit facilities and commercial paper, net 5,466    
Issuance of other long-term debt 2,639    
Repayment of other long-term debt (1,008) (416)  
Non-cash changes:      
Changes in foreign exchange and fair value 923 (230)  
Liabilities arising from financing activities, ending balance 18,819 10,799 11,445
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 1,555 1,540  
Changes from financing cash flows:      
Payment of lease liabilities (325) (285)  
Non-cash changes:      
Lease additions 231 317  
Changes in foreign exchange and fair value 3 (17)  
Liabilities arising from financing activities, ending balance $ 1,464 $ 1,555 $ 1,540