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IMPAIRMENT OF EQUITY INVESTMENTS (Details) - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Impairment loss on equity method investments	$ 615	$ 0	$ 2,351	$ 0
Loss from equity investments	$ (315)	$ (333)	$ (805)	$ (1,159)
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	$ 96		$ 96		$ 222
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	$ 87		$ 87		484
DCP Midstream, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50.00%		50.00%
Impairment loss on equity method investments	$ 0		$ 1,700
Loss from equity investments	324		324
Carrying value of investment	$ 340		$ 340		$ 2,200