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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 667 $ 816  
Accrued liabilities 2,346 2,611  
Long-term debt 21,453 20,982  
Other long-term liabilities 7,564 7,363  
Interest and other financing expense 828 912 $ 798
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 21,560 $ 21,090  
Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Lease payments included In liablities 189    
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,343    
1 to less than 2 years      
Disclosure of detailed information about financial instruments [line items]      
Lease payments included In liablities 162    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 4,887    
2 to less than 5 years      
Disclosure of detailed information about financial instruments [line items]      
Lease payments included In liablities 397    
Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Lease payments included In liablities 942    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,279    
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 667    
Accrued liabilities 2,346    
Other long-term liabilities 345    
Liquidity risk | Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,343    
Interest and other financing expense 776    
Liquidity risk | 1 to less than 2 years      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 200    
Liquidity risk | 1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 4,887    
Interest and other financing expense 693    
Liquidity risk | 2 to less than 5 years      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 435    
Liquidity risk | 2 to less than 5 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 7,051    
Interest and other financing expense 1,619    
Liquidity risk | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 942    
Liquidity risk | Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,279    
Interest and other financing expense $ 4,452