GOODWILL (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 27, 2022	Oct. 12, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 32,440	$ 32,775
Impairment	0	(2,465)	$ 0
Foreign exchange and other	(638)	1,738
Acquisition	46	392
Goodwill, ending balance	31,848	32,440	32,775
Goodwill [Abstract]
Goodwill, gross at end of period	35,900	36,500
Goodwill accumulated impairment	4,100	4,100
Goodwill	31,848	32,440	32,775
Impairment of goodwill (Note 15)	0	2,465	0
Moda Midstream Operating, LLC (Moda)
Goodwill [Abstract]
Goodwill					$ 268
Tri Global Energy, LLC
Goodwill [Roll Forward]
Goodwill, beginning balance	392
Goodwill, ending balance		392
Goodwill [Abstract]
Goodwill		392		$ 392
Liquids Pipelines
Goodwill [Roll Forward]
Goodwill, beginning balance	8,547	8,041
Impairment		0
Foreign exchange and other	(205)	506
Acquisition	0	0
Goodwill, ending balance	8,342	8,547	8,041
Goodwill [Abstract]
Goodwill	8,342	8,547	8,041
Impairment of goodwill (Note 15)		0
Gas Transmission and Midstream
Goodwill [Roll Forward]
Goodwill, beginning balance	18,106	19,335
Impairment		(2,465)
Foreign exchange and other	(425)	1,236
Acquisition	46	0
Goodwill, ending balance	17,727	18,106	19,335
Goodwill [Abstract]
Goodwill	17,727	18,106	19,335
Impairment of goodwill (Note 15)		2,465
Gas Distribution and Storage
Goodwill [Roll Forward]
Goodwill, beginning balance	5,397	5,397
Impairment		0
Foreign exchange and other	0	0
Acquisition	0	0
Goodwill, ending balance	5,397	5,397	5,397
Goodwill [Abstract]
Goodwill	5,397	5,397	5,397
Impairment of goodwill (Note 15)		0
Renewable Power Generation
Goodwill [Roll Forward]
Goodwill, beginning balance	388	0
Impairment		0
Foreign exchange and other	(8)	(4)
Acquisition	0	392
Goodwill, ending balance	380	388	0
Goodwill [Abstract]
Goodwill	380	388	0
Impairment of goodwill (Note 15)		0
Energy Services
Goodwill [Roll Forward]
Goodwill, beginning balance	2	2
Impairment		0
Foreign exchange and other	0	0
Acquisition	0	0
Goodwill, ending balance	2	2	2
Goodwill [Abstract]
Goodwill	2	2	$ 2
Impairment of goodwill (Note 15)		0
Gas Transmission Assets
Goodwill [Roll Forward]
Impairment	0	(2,500)
Goodwill [Abstract]
Impairment of goodwill (Note 15)	$ 0	$ 2,500