GOODWILL (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 12, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 32,775	$ 32,688
Impairment	(2,465)	0	$ 0
Foreign exchange and other	1,738	(200)
Acquisition	392	287
Goodwill, ending balance	32,440	32,775	32,688
Goodwill [Abstract]
Goodwill, gross at end of period	36,500	34,400
Goodwill accumulated impairment	4,100	1,600
Goodwill	32,440	32,775	32,688
Impairment of goodwill (Note 16)	2,465	0	0
Moda Midstream Operating, LLC (Moda)
Goodwill [Abstract]
Goodwill				$ 268
Liquids Pipelines
Goodwill [Roll Forward]
Goodwill, beginning balance	8,041	7,828
Impairment	0
Foreign exchange and other	506	(55)
Acquisition	0	268
Goodwill, ending balance	8,547	8,041	7,828
Goodwill [Abstract]
Goodwill	8,547	8,041	7,828
Impairment of goodwill (Note 16)	0
Gas Transmission and Midstream
Goodwill [Roll Forward]
Goodwill, beginning balance	19,335	19,480
Impairment	(2,465)
Foreign exchange and other	1,236	(145)
Acquisition	0	0
Goodwill, ending balance	18,106	19,335	19,480
Goodwill [Abstract]
Goodwill	18,106	19,335	19,480
Impairment of goodwill (Note 16)	2,465
Gas Distribution and Storage
Goodwill [Roll Forward]
Goodwill, beginning balance	5,397	5,378
Impairment	0
Foreign exchange and other	0	0
Acquisition	0	19
Goodwill, ending balance	5,397	5,397	5,378
Goodwill [Abstract]
Goodwill	5,397	5,397	5,378
Impairment of goodwill (Note 16)	0
Renewable Power Generation
Goodwill [Roll Forward]
Goodwill, beginning balance	0	0
Impairment	0
Foreign exchange and other	(4)	0
Acquisition	392	0
Goodwill, ending balance	388	0	0
Goodwill [Abstract]
Goodwill	388	0	0
Impairment of goodwill (Note 16)	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 16)	0
Gas Transmission Assets
Goodwill [Roll Forward]
Impairment	(2,500)
Goodwill [Abstract]
Impairment of goodwill (Note 16)	$ 2,500