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Supplemental Disclosure of Cash Flow Information - Liabilities Arising From Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 12,985 $ 16,159  
Changes from financing cash flows:      
Issue (repayment) of long-term debt (416) (4,010)  
Proceeds on settlement of cross currency swaps 0 69 $ 0
Payment of lease liabilities (285) (232) (209)
Non-cash changes:      
Lease additions 317 182  
Changes in foreign exchange and fair value (247) 817  
Liabilities arising from financing activities, ending balance 12,354 12,985 16,159
Long-term debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 11,445 14,694  
Changes from financing cash flows:      
Issue (repayment) of long-term debt (416) (4,010)  
Non-cash changes:      
Changes in foreign exchange and fair value (230) 761  
Liabilities arising from financing activities, ending balance 10,799 11,445 14,694
Cash flow hedges on US dollar debt securities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 0 (119)  
Changes from financing cash flows:      
Proceeds on settlement of cross currency swaps   69  
Non-cash changes:      
Changes in foreign exchange and fair value 0 50  
Liabilities arising from financing activities, ending balance 0 0 (119)
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 1,540 1,584  
Changes from financing cash flows:      
Payment of lease liabilities (285) (232)  
Non-cash changes:      
Lease additions 317 182  
Changes in foreign exchange and fair value (17) 6  
Liabilities arising from financing activities, ending balance $ 1,555 $ 1,540 $ 1,584