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Financial Instruments - Estimated Fair Values of Derivative Financial Instruments Included in Risk Management Asset (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]    
Derivative financial asset (liability), net $ (24) $ 178
Net change in fair value of outstanding derivatives financial instruments recognized in: Risk management activities (12) (32)
Net change in fair value of outstanding derivatives financial instruments recognized in: Foreign exchange 82 (168)
Net change in fair value of outstanding derivatives financial instruments recognized in: Other comprehensive income (loss) 9 (2)
Derivative financial asset (liability), net 55 (24)
Asset (liability), included in current portion of other long-term (liabilities) assets (67) (126)
Asset (liability), included in other long-term assets $ 122 $ 102