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Non-Operating Income (Expense)
 12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Non-Operating Income (Expense) Non-Operating Income (Expense)
(CAD$ in millions)20202019
Foreign exchange losses$(2)$(4)
Gain on debt prepayment option (Note 30(b))— 105 
Loss on debt redemption or purchase (Note 19(b))(11)(224)
Other56 26 
$43 $(97)