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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 816 $ 779  
Accrued liabilities 2,611 2,356  
Long-term debt 20,982 20,623  
Other long-term liabilities 7,363 3,890  
Interest and other financing expense 912 798 $ 728
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 21,090 $ 20,742  
Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Lease Payments Included In Liablities 233    
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,391    
1 to less than 2 years      
Disclosure of detailed information about financial instruments [line items]      
Lease Payments Included In Liablities 171    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,552    
2 to less than 5 years      
Disclosure of detailed information about financial instruments [line items]      
Lease Payments Included In Liablities 391    
Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Lease Payments Included In Liablities 1,014    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,226    
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 816    
Accrued liabilities 2,611    
Other long-term liabilities 370    
Liquidity risk | Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,391    
Interest and other financing expense 881    
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 196    
Liquidity risk | 1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,552    
Interest and other financing expense 813    
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 436    
Liquidity risk | 2 to less than 5 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,921    
Interest and other financing expense 1,771    
Liquidity risk | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 1,014    
Liquidity risk | Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 8,226    
Interest and other financing expense $ 4,856