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Financial Instruments - Carrying Amounts and Fair Values of Financial Instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount $ (133) $ (232)
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 (85) (160)
Other long-term liabilities | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (48) (72)
Fixed rate long-term debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (14,694) (21,453)
Fixed rate long-term debt | Fixed interest rate    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, carrying amount (13,554) (14,254)
Fixed rate long-term debt | Fixed interest rate | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities, at fair value (15,420) (16,598)
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 309 305
Investments | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value 309 305
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 140 691
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 140 136
Other long-term assets | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, at fair value $ 0 $ 555