SEGMENTED INFORMATION (Details) $ in Millions, $ in Millions			3 Months Ended		9 Months Ended
	Aug. 17, 2022 CAD ($)	Aug. 17, 2022 USD ($)	Sep. 30, 2023 CAD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2023 CAD ($)	Sep. 30, 2022 CAD ($)
Segmented Information
Operating revenues			$ 9,844	$ 11,573	$ 32,351	$ 39,885
Commodity and gas distribution costs			(4,831)	(6,630)	(15,978)	(25,014)
Operating and administrative			(2,055)	(2,089)	(6,120)	(5,958)
Income/(loss) from equity investments			343	536	1,338	1,537
Gain on joint venture merger transaction	$ 1,100	$ 832	0	1,076	0	1,076
Other income/(expense)			(465)	(883)	212	(924)
Earnings/(loss) before interest, income taxes and depreciation and amortization			2,836	3,583	11,803	10,602
Depreciation and amortization			(1,164)	(1,076)	(3,447)	(3,195)
Interest expense			(921)	(806)	(2,709)	(2,316)
Income tax expense			(128)	(318)	(1,157)	(1,044)
Earnings			623	1,383	4,490	4,047
Capital expenditures			2,347	1,215	3,323	3,236
Eliminations and Other
Segmented Information
Operating revenues			(112)	(140)	(390)	(457)
Commodity and gas distribution costs			120	140	392	454
Operating and administrative			(11)	7	46	(158)
Income/(loss) from equity investments			(3)	0	(10)	(2)
Gain on joint venture merger transaction				0		0
Other income/(expense)			(573)	(942)	(82)	(1,121)
Earnings/(loss) before interest, income taxes and depreciation and amortization			(579)	(935)	(44)	(1,284)
Capital expenditures			27	8	54	32
Liquids Pipelines | Business segments
Segmented Information
Operating revenues			3,084	2,899	9,519	8,592
Commodity and gas distribution costs			0	27	0	0
Operating and administrative			(1,088)	(1,173)	(3,294)	(3,096)
Income/(loss) from equity investments			231	193	733	561
Gain on joint venture merger transaction				0		0
Other income/(expense)			20	0	103	36
Earnings/(loss) before interest, income taxes and depreciation and amortization			2,247	1,946	7,061	6,093
Capital expenditures			598	268	835	1,086
Gas Transmission and Midstream | Business segments
Segmented Information
Operating revenues			1,423	1,366	4,324	3,967
Commodity and gas distribution costs			1	0	1	0
Operating and administrative			(578)	(545)	(1,715)	(1,620)
Income/(loss) from equity investments			94	321	531	877
Gain on joint venture merger transaction				1,076		1,076
Other income/(expense)			33	33	79	84
Earnings/(loss) before interest, income taxes and depreciation and amortization			973	2,251	3,220	4,384
Capital expenditures			989	525	1,332	1,087
Gas Distribution and Storage | Business segments
Segmented Information
Operating revenues			751	909	4,426	4,458
Commodity and gas distribution costs			(190)	(327)	(2,173)	(2,258)
Operating and administrative			(305)	(311)	(939)	(891)
Income/(loss) from equity investments			0	0	1	1
Gain on joint venture merger transaction				0		0
Other income/(expense)			15	15	39	58
Earnings/(loss) before interest, income taxes and depreciation and amortization			271	286	1,354	1,368
Capital expenditures			679	405	1,025	1,005
Renewable Power Generation | Business segments
Segmented Information
Operating revenues			40	120	334	431
Commodity and gas distribution costs			(13)	(5)	(19)	(13)
Operating and administrative			(63)	(58)	(178)	(159)
Income/(loss) from equity investments			21	22	83	100
Gain on joint venture merger transaction				0		0
Other income/(expense)			45	26	75	30
Earnings/(loss) before interest, income taxes and depreciation and amortization			30	105	295	389
Capital expenditures			54	9	77	26
Energy Services | Business segments
Segmented Information
Operating revenues			4,658	6,419	14,138	22,894
Commodity and gas distribution costs			(4,749)	(6,465)	(14,179)	(23,197)
Operating and administrative			(10)	(9)	(40)	(34)
Income/(loss) from equity investments			0	0	0	0
Gain on joint venture merger transaction				0		0
Other income/(expense)			(5)	(15)	(2)	(11)
Earnings/(loss) before interest, income taxes and depreciation and amortization			(106)	(70)	(83)	(348)
Capital expenditures			$ 0	$ 0	$ 0	$ 0