Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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GOODWILL GOODWILL - NARRATIVE (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 27, 2017
GOODWILL
Goodwill	CAD 34,457	CAD 78
Goodwill, Written off Related to Sale of Business Unit	29
Impairment	CAD 102	CAD 0	CAD 440
Goodwill, impairment loss, net of tax			CAD 167
Spectra Energy Corp
GOODWILL
Goodwill				CAD 36,656