SEGMENTED INFORMATION - Schedule of Reporting Information by Segment (Details) $ in Millions, $ in Millions			3 Months Ended								12 Months Ended
	Aug. 17, 2022 CAD ($)	Aug. 17, 2022 USD ($)	Dec. 31, 2024 CAD ($)	Sep. 30, 2024 CAD ($)	Jun. 30, 2024 CAD ($)	Mar. 31, 2024 CAD ($)	Dec. 31, 2023 CAD ($)	Sep. 30, 2023 CAD ($)	Jun. 30, 2023 CAD ($)	Mar. 31, 2023 CAD ($)	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2022 CAD ($)
Segmented Information
Revenues			$ 16,217	$ 14,882	$ 11,336	$ 11,038	$ 11,298	$ 9,844	$ 10,432	$ 12,075	$ 53,473	$ 43,649	$ 53,309
Operating and administrative											(9,427)	(8,600)	(8,219)
Impairment of goodwill											0	0	(2,465)
Income from equity investments											2,304	1,816	2,056
Gain on disposition of equity investments											1,091	0	0
Gain on joint venture merger transaction	$ 1,100	$ 832									0	0	1,076
Earnings before interest, income taxes and depreciation and amortization											18,789	15,388	13,156
Depreciation and amortization											(5,167)	(4,613)	(4,317)
Interest expense (Note 17)											(4,419)	(3,812)	(3,179)
Earnings before income taxes											7,299	7,879	4,542
Capital expenditures											6,834	4,708	4,690
Property, plant and equipment, net			131,104				104,641				131,104	104,641	104,460
Business Segments
Segmented Information
Revenues											52,438	42,189	49,911
Commodity and gas distribution costs											(27,910)	(20,012)	(29,204)
Operating and administrative											(9,397)	(8,585)	(8,116)
Impairment of long-lived assets											(190)	(419)	(493)
Impairment of goodwill													(2,465)
Income from equity investments											2,321	1,837	2,060
Gain on disposition of equity investments											1,091
Gain on joint venture merger transaction													1,076
Other income											436	378	387
Business Segments | Liquids Pipelines
Segmented Information
Revenues											38,183	29,882	37,174
Commodity and gas distribution costs											(25,283)	(17,106)	(25,495)
Operating and administrative											(4,495)	(4,659)	(4,318)
Impairment of long-lived assets											(2)	145	(258)
Impairment of goodwill													0
Income from equity investments											1,051	1,007	785
Gain on disposition of equity investments											0
Gain on joint venture merger transaction													0
Other income											77	114	53
Earnings before interest, income taxes and depreciation and amortization											9,531	9,383	7,941
Capital expenditures											1,157	1,158	1,418
Property, plant and equipment, net			53,863				51,855				53,863	51,855	53,573
Business Segments | Gas Transmission
Segmented Information
Revenues											6,199	5,854	5,426
Commodity and gas distribution costs											(130)	(15)	0
Operating and administrative											(2,322)	(2,380)	(2,254)
Impairment of long-lived assets											(162)	0	0
Impairment of goodwill													(2,465)
Income from equity investments											812	688	1,133
Gain on disposition of equity investments											1,063
Gain on joint venture merger transaction													1,076
Other income											196	117	210
Earnings before interest, income taxes and depreciation and amortization											5,656	4,264	3,126
Capital expenditures											2,571	1,944	1,690
Property, plant and equipment, net			34,683				31,016				34,683	31,016	29,666
Business Segments | Gas Distribution and Storage
Segmented Information
Revenues											7,542	5,976	6,729
Commodity and gas distribution costs											(2,501)	(2,871)	(3,693)
Operating and administrative											(2,276)	(1,285)	(1,289)
Impairment of long-lived assets											(3)	(281)	0
Impairment of goodwill													0
Income from equity investments											3	2	1
Gain on disposition of equity investments											0
Gain on joint venture merger transaction													0
Other income											104	51	79
Earnings before interest, income taxes and depreciation and amortization											2,869	1,592	1,827
Capital expenditures											2,386	1,451	1,499
Property, plant and equipment, net			38,636				18,766				38,636	18,766	17,857
Business Segments | Renewable Power Generation
Segmented Information
Revenues											514	477	582
Commodity and gas distribution costs											4	(20)	(16)
Operating and administrative											(304)	(261)	(255)
Impairment of long-lived assets											(23)	(283)	(235)
Impairment of goodwill													0
Income from equity investments											455	140	141
Gain on disposition of equity investments											28
Gain on joint venture merger transaction													0
Other income											59	96	45
Earnings before interest, income taxes and depreciation and amortization											733	149	262
Capital expenditures											661	100	50
Property, plant and equipment, net			3,612				2,706				3,612	2,706	3,082
Eliminations and Other
Segmented Information
Revenues											(1,904)	916	(1,118)
Capital expenditures											59	55	33
Property, plant and equipment, net			$ 310				$ 298				$ 310	$ 298	$ 282