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Financial Instruments - Carrying Amounts and Fair Values of Financial Instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount $ (207) $ (135)
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 (112) (17)
Other long-term liabilities | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (95) (118)
Fixed rate long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (20,982) (20,623)
Fixed rate long-term debt | Fixed interest rate    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (14,110) (15,620)
Fixed rate long-term debt | Fixed interest rate | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (15,938) (15,952)
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 490 524
Investments | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 490 524
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 942 964
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 290 373
Other long-term assets | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value $ 652 $ 591