GOODWILL (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 32,688	$ 33,153
Foreign exchange and other	(200)	(487)
Acquisition	287	22
Goodwill, ending balance	32,775	32,688	$ 33,153
Goodwill [Abstract]
Goodwill, gross at end of period	34,400	34,300
Goodwill accumulated impairment	1,600	1,600
Goodwill related to acquisition	287	22
Goodwill on the acquisition	319	6	(254)
Moda Midstream Operating, LLC (Moda)
Goodwill [Roll Forward]
Acquisition	268
Goodwill [Abstract]
Goodwill related to acquisition	268
Liquids Pipelines
Goodwill [Roll Forward]
Goodwill, beginning balance	7,828	7,951
Foreign exchange and other	(55)	(123)
Acquisition	268	0
Goodwill, ending balance	8,041	7,828	7,951
Goodwill [Abstract]
Goodwill related to acquisition	268	0
Gas Transmission and Midstream
Goodwill [Roll Forward]
Goodwill, beginning balance	19,480	19,844
Foreign exchange and other	(145)	(364)
Acquisition	0	0
Goodwill, ending balance	19,335	19,480	19,844
Goodwill [Abstract]
Goodwill related to acquisition	0	0
Gas Distribution and Storage
Goodwill [Roll Forward]
Goodwill, beginning balance	5,378	5,356
Foreign exchange and other	0	0
Acquisition	19	22
Goodwill, ending balance	5,397	5,378	5,356
Goodwill [Abstract]
Goodwill related to acquisition	19	22
Energy Services
Goodwill [Roll Forward]
Goodwill, beginning balance	2	2
Foreign exchange and other	0	0
Acquisition	0	0
Goodwill, ending balance	2	2	$ 2
Goodwill [Abstract]
Goodwill related to acquisition	$ 0	$ 0

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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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 of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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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