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Non-Operating Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2019
Analysis of income and expense [abstract]  
Schedule of Non-Operating Income (Expense)
(CAD$ in millions)
 
2019

 
2018

Foreign exchange gains (losses)
 
$
(4
)
 
$
16

Gain (loss) on debt prepayment option
 
105

 
(42
)
Loss on debt redemption or purchase (Note 19(a))
 
(224
)
 
(26
)
Other
 
26

 
—

 
 
$
(97
)
 
$
(52
)