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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 1,079 $ 1,418  
Accrued liabilities 4,525 3,534  
Long-term debt 18,819 10,799  
Other long-term liabilities 9,302 8,686  
Interest and other financing expense 673 691 $ 670
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 18,909 $ 10,859  
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,400    
Less than 1 year | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 1,079    
Accrued liabilities 4,525    
Other long-term liabilities 263    
Lease payments included In liablities 255    
Less than 1 year | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,400    
Interest and other financing expense 1,024    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 941    
1 to less than 2 years | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Other long-term liabilities 187    
Lease payments included In liablities 187    
1 to less than 2 years | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 941    
Interest and other financing expense 951    
2 to less than 5 years | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Other long-term liabilities 405    
Lease payments included In liablities 405    
2 to less than 5 years | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 7,494    
Interest and other financing expense 1,978    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,074    
Thereafter | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Other long-term liabilities 617    
Lease payments included In liablities 617    
Thereafter | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,074    
Interest and other financing expense $ 3,574