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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 1,418 $ 1,341  
Accrued liabilities 3,534 4,209  
Long-term debt 10,799 11,445  
Other long-term liabilities 8,686 8,161  
Interest and other financing expense 691 670 $ 743
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 10,859 $ 11,514  
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 980    
Less than 1 year | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 1,418    
Accrued liabilities 3,534    
Other long-term liabilities 302    
Lease payments included In liablities 298    
Less than 1 year | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 980    
Interest and other financing expense 582    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,584    
1 to less than 2 years | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Other long-term liabilities 184    
Lease payments included In liablities 184    
1 to less than 2 years | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,584    
Interest and other financing expense 518    
2 to less than 5 years | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Other long-term liabilities 428    
Lease payments included In liablities 428    
2 to less than 5 years | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,317    
Interest and other financing expense 1,257    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 5,978    
Thereafter | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Other long-term liabilities 645    
Lease payments included In liablities 645    
Thereafter | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 5,978    
Interest and other financing expense $ 3,362