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Net Interest Expense
 12 Months Ended
Dec. 31, 2018
Interest Income (Expense), Net [Abstract]  
Net Interest Expense
(in millions of Canadian dollars)
2018

2017

2016

Interest cost
$
475

$
491

$
497

Interest capitalized to Properties
(20
)
(16
)
(25
)
Interest expense
455

475

472

Interest income
(2
)
(2
)
(1
)
Net interest expense
$
453

$
473

$
471



Interest expense includes interest on capital leases of $11 million for the year ended December 31, 2018 (2017 – $11 million; 2016 – $11 million).