Net Interest Expense (Tables)

12 Months Ended

Dec. 31, 2017

Interest Income (Expense), Net [Abstract]

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