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Net Interest Expense
 12 Months Ended
Dec. 31, 2017
Interest Income (Expense), Net [Abstract]  
Net Interest Expense Net interest expense
(in millions of Canadian dollars)
2017

2016

2015

Interest cost
$
491

$
497

$
409

Interest capitalized to Properties
(16
)
(25
)
(14
)
Interest expense
475

472

395

Interest income
(2
)
(1
)
(1
)
Net interest expense
$
473

$
471

$
394



Interest expense includes interest on capital leases of $11 million for the year ended December 31, 2017 (2016 – $11 million; 2015 – $11 million).