GOODWILL (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gross Cost
Goodwill, gross at beginning of period	$ 36,040	$ 35,019
Disposition		(628)
Allocation to assets held for sale		(188)
Foreign exchange and other	(1,306)	1,837
Goodwill, gross at end of period	34,734	36,040	$ 35,019
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	(1,581)	(562)
Impairment	0	(1,019)	(102)
Goodwill, impaired, accumulated impairment loss at end of period	(1,581)	(1,581)	(562)
Goodwill	33,153	34,459
Eliminations and Other
Gross Cost
Goodwill, gross at beginning of period	13	13
Disposition		0
Allocation to assets held for sale		0
Foreign exchange and other	0	0
Goodwill, gross at end of period	13	13	13
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	(13)	(13)
Impairment	0	0	0
Goodwill, impaired, accumulated impairment loss at end of period	(13)	(13)	(13)
Goodwill	0	0
Liquids Pipelines
Gross Cost
Goodwill, gross at beginning of period	8,324	7,786
Disposition		0
Allocation to assets held for sale		0
Foreign exchange and other	(373)	538
Goodwill, gross at end of period	7,951	8,324	7,786
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	0	0
Impairment		0
Goodwill, impaired, accumulated impairment loss at end of period	0	0	0
Goodwill	7,951	8,324
Gas Transmission and Midstream
Gross Cost
Goodwill, gross at beginning of period	22,338	21,539
Disposition		(628)
Allocation to assets held for sale		(55)
Foreign exchange and other	(933)	1,482
Goodwill, gross at end of period	21,405	22,338	21,539
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	(1,561)	(542)
Impairment		(1,019)
Goodwill, impaired, accumulated impairment loss at end of period	(1,561)	(1,561)	(542)
Goodwill	19,844	20,777
Gas Distribution and Storage
Gross Cost
Goodwill, gross at beginning of period	5,363	5,679
Disposition		0
Allocation to assets held for sale		(133)
Foreign exchange and other	0	(183)
Goodwill, gross at end of period	5,363	5,363	5,679
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	(7)	(7)
Impairment		0
Goodwill, impaired, accumulated impairment loss at end of period	(7)	(7)	(7)
Goodwill	5,356	5,356
Renewable Power Generation
Gross Cost
Goodwill, gross at beginning of period	0	0
Disposition		0
Allocation to assets held for sale		0
Foreign exchange and other	0	0
Goodwill, gross at end of period	0	0	0
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	0	0
Impairment		0
Goodwill, impaired, accumulated impairment loss at end of period	0	0	0
Goodwill	0	0
Energy Services
Gross Cost
Goodwill, gross at beginning of period	2	2
Disposition		0
Allocation to assets held for sale		0
Foreign exchange and other	0	0
Goodwill, gross at end of period	2	2	2
Accumulated Impairment
Goodwill, impaired, accumulated impairment loss at beginning of period	0	0
Impairment		0
Goodwill, impaired, accumulated impairment loss at end of period	0	0	$ 0
Goodwill	$ 2	$ 2

Goodwill, Allocation to Assets Held for Sale

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Represents the increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments and other adjustments.

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- Definition

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture 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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