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Financial Instruments - Carrying Amounts and Fair Values of Financial Instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount $ (232) $ (207)
Other long-term liabilities | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0 0
Other long-term liabilities | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (160) (112)
Other long-term liabilities | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (72) (95)
Fixed rate long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (21,453) (20,982)
Fixed rate long-term debt | Fixed interest rate    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (14,254) (14,110)
Fixed rate long-term debt | Fixed interest rate | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (16,598) (15,938)
Fixed rate long-term debt | Fixed interest rate | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0 0
Fixed rate long-term debt | Fixed interest rate | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value 0 0
Investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount 305 490
Investments | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 305 490
Investments | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Investments | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Other long-term assets    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount 691 942
Other long-term assets | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 0 0
Other long-term assets | Level 2    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 136 290
Other long-term assets | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value $ 555 $ 652