XML 125 R97.htm IDEA: XBRL DOCUMENT v3.21.1
Financial Instruments - Estimated Fair Values of Derivative Financial Instruments Included in Risk Management Asset (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation Of Changes In Derivative Financial Assets (Liabilities), Net [Roll Forward]    
Derivative financial asset (liability), net $ 178 $ 356
Net change in fair value of outstanding derivatives financial instruments recognized in: Risk management activities (32) (13)
Net change in fair value of outstanding derivatives financial instruments recognized in: Foreign exchange (168) (231)
Net change in fair value of outstanding derivatives financial instruments recognized in: Other comprehensive income (loss) (2) 66
Derivative financial asset (liability), net (24) 178
Asset (liability), included in current portion of other long-term (liabilities) assets (126) (104)
Asset (liability), included in other long-term assets $ 102 $ 282