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IMPAIRMENT OF EQUITY INVESTMENTS (Details) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Impairment loss on equity method investments	$ 111	$ 615	$ 111	$ 2,351
Loss from equity investments	$ (440)	(315)	$ (1,187)	(805)
PennEast Pipeline Company, L.L.C.
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	20.00%		20.00%
Impairment loss on equity method investments	$ 111		$ 111
Carrying value of investment	$ 11		$ 11		$ 116
Steckman Ridge, LP
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50.00%		50.00%
Impairment loss on equity method investments		221		221
Carrying value of investment	$ 88		$ 88		90
Southeast Supply Header, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50.00%		50.00%
Impairment loss on equity method investments		$ 394		394
Carrying value of investment	$ 83		$ 83		84
DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50.00%		50.00%
Impairment loss on equity method investments				1,700
Loss from equity investments				$ 324
Carrying value of investment	$ 298		$ 298		$ 331