Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

				Intangible assets
(in millions of Canadian dollars)	Goodwill			Cost		Accumulated amortization			Net carrying amount			Total goodwill and intangible assets
Balance at December 31, 2014	$	164		$	22	$	(10	)	$	12		$	176
Amortization	—			—		(1		)	(1		)	(1		)
Foreign exchange impact	31			—		2			2			33
Additions	3			—		—			—			3
Balance at December 31, 2015	$	198		$	22	$	(9	)	$	13		$	211
Amortization	—			—		(1		)	(1		)	(1		)
Foreign exchange impact	(7		)	—		(1		)	(1		)	(8		)
Balance at December 31, 2016	$	191		$	22	$	(11	)	$	11		$	202