SEGMENTED INFORMATION - Schedule of Reporting Information by Segment (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segmented Information
Operating revenues	$ 14,876	$ 11,336	$ 33,378	$ 22,374
Operating and administrative	(2,310)	(2,308)	(4,781)	(4,442)
Impairment of long-lived assets	(330)	0	(330)	0
Income from equity investments	510	489	1,239	1,185
Gain on disposition of equity investments	0	1,091	0	1,091
Earnings before interest, income taxes and depreciation and amortization	4,392	5,250	10,281	9,941
Depreciation and amortization	(1,391)	(1,273)	(2,799)	(2,466)
Interest expense	(1,181)	(1,082)	(2,515)	(1,987)
Earnings before income taxes	2,987	2,740	6,174	4,691
Capital expenditures	1,940	1,364	3,694	2,564
Property, plant and equipment, net	128,179		128,179		$ 131,104
Business Segments
Segmented Information
Operating revenues	14,602	11,140	32,577	21,856
Commodity and gas distribution costs	(8,309)	(5,260)	(18,801)	(9,949)
Operating and administrative	(2,306)	(2,303)	(4,808)	(4,419)
Impairment of long-lived assets	(330)		(330)
Income from equity investments	513	494	1,246	1,193
Gain on disposition of equity investments		1,091		1,091
Other income	222	88	397	169
Business Segments | Liquids Pipelines
Segmented Information
Operating revenues	10,837	8,158	23,021	15,040
Commodity and gas distribution costs	(7,741)	(4,909)	(16,591)	(8,544)
Operating and administrative	(1,032)	(1,100)	(2,160)	(2,207)
Impairment of long-lived assets	0		0
Income from equity investments	245	284	613	537
Gain on disposition of equity investments		0		0
Other income	22	17	41	28
Earnings before interest, income taxes and depreciation and amortization	2,331	2,450	4,924	4,854
Capital expenditures	284	209	593	498
Property, plant and equipment, net	51,835		51,835		53,863
Business Segments | Gas Transmission
Segmented Information
Operating revenues	1,604	1,492	3,319	3,064
Commodity and gas distribution costs	(16)	(41)	(27)	(88)
Operating and administrative	(514)	(604)	(1,038)	(1,165)
Impairment of long-lived assets	0		0
Income from equity investments	241	164	473	429
Gain on disposition of equity investments		1,063		1,063
Other income	127	21	188	57
Earnings before interest, income taxes and depreciation and amortization	1,442	2,095	2,915	3,360
Capital expenditures	691	666	1,295	1,161
Property, plant and equipment, net	33,981		33,981		34,683
Business Segments | Gas Distribution and Storage
Segmented Information
Operating revenues	2,016	1,384	5,972	3,515
Commodity and gas distribution costs	(553)	(312)	(2,187)	(1,316)
Operating and administrative	(688)	(528)	(1,460)	(907)
Impairment of long-lived assets	(330)		330
Income from equity investments	0	1	1	1
Gain on disposition of equity investments		0		0
Other income	65	22	114	39
Earnings before interest, income taxes and depreciation and amortization	510	567	2,110	1,332
Capital expenditures	735	433	1,396	737
Property, plant and equipment, net	38,261		38,261		38,636
Business Segments | Renewable Power Generation
Segmented Information
Operating revenues	145	106	265	237
Commodity and gas distribution costs	1	2	4	(1)
Operating and administrative	(72)	(71)	(150)	(140)
Impairment of long-lived assets	0		0
Income from equity investments	27	45	159	226
Gain on disposition of equity investments		28		28
Other income	8	28	54	45
Earnings before interest, income taxes and depreciation and amortization	109	138	332	395
Capital expenditures	214	48	359	117
Property, plant and equipment, net	3,781		3,781		3,612
Eliminations and Other
Segmented Information
Operating revenues	1,167	(155)	1,207	(797)
Capital expenditures	16	$ 8	51	$ 51
Property, plant and equipment, net	$ 321		$ 321		$ 310