Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

	Goodwill			Intangible assets
(in millions of Canadian dollars)	Net carrying amount			Cost		Accumulated amortization			Net carrying amount			Total goodwill and intangible assets
Balance at December 31, 2016	$	191		$	22	$	(11	)	$	11		$	202
Amortization	—			—		(1		)	(1		)	(1		)
Foreign exchange impact	(13		)	—		(1		)	(1		)	(14		)
Balance at December 31, 2017	$	178		$	22	$	(13	)	$	9		$	187
Amortization	—			—		(1		)	(1		)	(1		)
Foreign exchange impact	16			—		—			—			16
Balance at December 31, 2018	$	194		$	22	$	(14	)	$	8		$	202