GOODWILL (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

	Liquids Pipelines		Gas Transmission & Midstream		Gas Distribution		Green Power and Transmission	Energy Services	Eliminations and Other		Consolidated
(millions of Canadian dollars)
Gross Cost
Balance at January 1, 2016	60		458		7		—	2	13		540
Foreign exchange and other	(1	)	(1	)	—		—	—	—		(2	)
Balance at December 31, 2016	59		457		7		—	2	13		538
Acquired in Merger Transaction (Note 7)	8,070		22,914		5,672		—	—	—		36,656
Sabal Trail deconsolidation (Note 12)	—		(966	)							(966	)
Disposition	(29	)	—		—		—	—	—		(29	)
Foreign exchange and other	(314	)	(866	)	—		—	—	—		(1,180	)
Balance at December 31, 2017	7,786		21,539		5,679		—	2	13		35,019
Accumulated Impairment
Balance at January 1, 2016	—		(440	)	(7	)	—	—	(13	)	(460	)
Impairment	—		—		—		—	—	—		—
Balance at December 31, 2016	—		(440	)	(7	)	—	—	(13	)	(460	)
Impairment	—		(102	)	—		—	—	—		(102	)
Balance at December 31, 2017	—		(542	)	(7	)	—	—	(13	)	(562	)
Carrying Value
Balance at December 31, 2016	59		17		—		—	2	—		78
Balance at December 31, 2017	7,786		20,997		5,672		—	2	—		34,457