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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 1,341 $ 803  
Accrued liabilities 4,209 3,064  
Long-term debt 11,445 14,694  
Other long-term liabilities 8,161 8,384  
Interest and other financing expense 670 743 $ 828
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 11,514 $ 14,781  
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 404    
Less than 1 year | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 1,341    
Accrued liabilities 4,209    
Other long-term liabilities 247    
Lease payments included In liablities 244    
Less than 1 year | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 404    
Interest and other financing expense 584    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,009    
1 to less than 2 years | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 156    
Lease payments included In liablities 156    
1 to less than 2 years | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,009    
Interest and other financing expense 577    
2 to less than 5 years | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 416    
Lease payments included In liablities 416    
2 to less than 5 years | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 3,757    
Interest and other financing expense 1,410    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 6,344    
Thereafter | Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 724    
Lease payments included In liablities 724    
Thereafter | Liquidity risk | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 6,344    
Interest and other financing expense $ 3,790