GOODWILL (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill recorded on the entity's acquisitions in the U.S.

The Company has recorded the following Goodwill on its acquisitions in the U.S.:

(millions of Canadian $)	U.S. Natural Gas Pipelines		Energy		Total
Balance at January 1, 2016	3,667		1,145		4,812
Acquisition of Columbia (Note 5)	10,078		—		10,078
Impairment charge	—		(1,085	)	(1,085	)
Foreign exchange rate changes	213		(60	)	153
Balance at December 31, 2016	13,958		—		13,958
Columbia adjustment (Note 5)	71		—		71
Foreign exchange rate changes	(945	)	—		(945	)
Balance at December 31, 2017	13,084		—		13,084