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IMPAIRMENT OF EQUITY INVESTMENTS (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Impairment loss on equity method investments	$ 0	$ 0	$ 0	$ 1,736
Loss from equity investments	$ (352)	$ (327)	$ (747)	(490)
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	$ 286		$ 286		$ 331