SEGMENTED INFORMATION - Schedule of Segment (Details) $ in Millions, $ in Millions			3 Months Ended								12 Months Ended
	Aug. 17, 2022 CAD ($)	Aug. 17, 2022 USD ($)	Dec. 31, 2023 CAD ($)	Sep. 30, 2023 CAD ($)	Jun. 30, 2023 CAD ($)	Mar. 31, 2023 CAD ($)	Dec. 31, 2022 CAD ($)	Sep. 30, 2022 CAD ($)	Jun. 30, 2022 CAD ($)	Mar. 31, 2022 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)
Segmented Information
Operating revenues (Note 4)			$ 11,298	$ 9,844	$ 10,432	$ 12,075	$ 13,424	$ 11,573	$ 13,215	$ 15,097	$ 43,649	$ 53,309	$ 47,071
Commodity and gas distribution costs											(21,366)	(32,589)	(28,702)
Operating and administrative											(8,600)	(8,219)	(6,712)
Impairment of long-lived assets											(419)	(541)
Impairment of goodwill (Note 15)											0	(2,465)	0
Income/(loss) from equity investments (Note 13)											1,816	2,056	1,600
Gain on joint venture merger transaction (Note 13)	$ 1,100	$ 832									0	1,076	0
Other income (Note 27)											1,224	(589)	979
Earnings/(loss) before interest, income taxes and depreciation and amortization											16,304	12,038	14,236
Depreciation and amortization											(4,613)	(4,317)	(3,852)
Interest expense (Note 17)											(3,812)	(3,179)	(2,655)
Income tax expense (Note 24)											(1,821)	(1,604)	(1,415)
Earnings			1,568	$ 623	$ 2,001	$ 1,866	(1,109)	$ 1,383	$ 607	$ 2,057	6,058	2,938	6,314
Capital expenditures											4,708	4,690	7,885
Property, plant and equipment, net			104,641				104,460				104,641	104,460	100,067
Liquids Pipelines
Segmented Information
Impairment of goodwill (Note 15)												0
Gas Transmission and Midstream
Segmented Information
Impairment of goodwill (Note 15)												(2,465)
Gas Distribution and Storage
Segmented Information
Impairment of goodwill (Note 15)												0
Business Segments | Liquids Pipelines
Segmented Information
Operating revenues (Note 4)											12,863	12,052	10,581
Commodity and gas distribution costs											0	0	(25)
Operating and administrative											(4,629)	(4,287)	(3,431)
Impairment of long-lived assets											145	(245)
Impairment of goodwill (Note 15)												0
Income/(loss) from equity investments (Note 13)											1,007	785	759
Gain on joint venture merger transaction (Note 13)												0
Other income (Note 27)											113	59	13
Earnings/(loss) before interest, income taxes and depreciation and amortization											9,499	8,364	7,897
Capital expenditures											1,158	1,418	4,051
Property, plant and equipment, net			51,851				53,567				51,851	53,567	52,530
Business Segments | Gas Transmission and Midstream
Segmented Information
Operating revenues (Note 4)											5,854	5,426	4,711
Commodity and gas distribution costs											(15)	0	0
Operating and administrative											(2,380)	(2,254)	(1,877)
Impairment of long-lived assets											0	0
Impairment of goodwill (Note 15)												(2,465)
Income/(loss) from equity investments (Note 13)											688	1,133	702
Gain on joint venture merger transaction (Note 13)												1,076
Other income (Note 27)											117	210	135
Earnings/(loss) before interest, income taxes and depreciation and amortization											4,264	3,126	3,671
Capital expenditures											1,944	1,690	2,420
Property, plant and equipment, net			31,016				29,666				31,016	29,666	27,028
Business Segments | Gas Distribution and Storage
Segmented Information
Operating revenues (Note 4)											5,976	6,729	4,980
Commodity and gas distribution costs											(2,871)	(3,693)	(2,147)
Operating and administrative											(1,285)	(1,289)	(1,143)
Impairment of long-lived assets											(281)	0
Impairment of goodwill (Note 15)												0
Income/(loss) from equity investments (Note 13)											2	1	42
Gain on joint venture merger transaction (Note 13)												0
Other income (Note 27)											51	79	385
Earnings/(loss) before interest, income taxes and depreciation and amortization											1,592	1,827	2,117
Capital expenditures											1,451	1,499	1,343
Property, plant and equipment, net			18,766				17,857				18,766	17,857	16,904
Business Segments | Renewable Power Generation
Segmented Information
Operating revenues (Note 4)											477	582	512
Commodity and gas distribution costs											(20)	(16)	0
Operating and administrative											(261)	(255)	(180)
Impairment of long-lived assets											(283)	(235)
Impairment of goodwill (Note 15)												0
Income/(loss) from equity investments (Note 13)											140	141	101
Gain on joint venture merger transaction (Note 13)												0
Other income (Note 27)											96	45	75
Earnings/(loss) before interest, income taxes and depreciation and amortization											149	262	508
Capital expenditures											100	50	16
Property, plant and equipment, net			2,706				3,082				2,706	3,082	3,315
Business Segments | Energy Services
Segmented Information
Operating revenues (Note 4)											18,989	29,175	26,917
Commodity and gas distribution costs											(18,975)	(29,525)	(27,174)
Operating and administrative											(52)	(49)	(48)
Impairment of long-lived assets											0	(13)
Impairment of goodwill (Note 15)												0
Income/(loss) from equity investments (Note 13)											0	0	0
Gain on joint venture merger transaction (Note 13)												0
Other income (Note 27)											1	(5)	(8)
Earnings/(loss) before interest, income taxes and depreciation and amortization											(37)	(417)	(313)
Capital expenditures											0	0	1
Property, plant and equipment, net			4				6				4	6	23
Eliminations and Other
Segmented Information
Operating revenues (Note 4)											(510)	(655)	(630)
Commodity and gas distribution costs											515	645	644
Operating and administrative											7	(85)	(33)
Impairment of long-lived assets											0	(48)
Impairment of goodwill (Note 15)												0
Income/(loss) from equity investments (Note 13)											(21)	(4)	(4)
Gain on joint venture merger transaction (Note 13)												0
Other income (Note 27)											846	(977)	379
Earnings/(loss) before interest, income taxes and depreciation and amortization											837	(1,124)	356
Capital expenditures											55	33	54
Property, plant and equipment, net			$ 298				$ 282				$ 298	$ 282	$ 267