SEGMENTED INFORMATION (Details) $ in Millions, $ in Millions			3 Months Ended								12 Months Ended
	Aug. 17, 2022 CAD ($)	Aug. 17, 2022 USD ($)	Dec. 31, 2022 CAD ($)	Sep. 30, 2022 CAD ($)	Jun. 30, 2022 CAD ($)	Mar. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Sep. 30, 2021 CAD ($)	Jun. 30, 2021 CAD ($)	Mar. 31, 2021 CAD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 CAD ($)
Segmented Information
Revenues (Note 4)			$ 13,424	$ 11,573	$ 13,215	$ 15,097	$ 12,470	$ 11,466	$ 10,948	$ 12,187	$ 53,309	$ 47,071	$ 39,087
Commodity and gas distribution costs											(32,589)	(28,702)	(20,669)
Operating and administrative											(8,219)	(6,712)	(6,749)
Impairment of long-lived assets											(541)
Impairment of goodwill (Note 16)											(2,465)	0	0
Income/(loss) from equity investments (Note 13)											2,056	1,711	1,136
Impairment of equity investments											0	(111)	(2,351)
Gain on joint venture merger transaction (Note 13)	$ 1,100	$ 832									1,076	0	0
Other income/(expense) (Note 28)											(589)	979	238
Earnings/(loss) before interest, income taxes and depreciation and amortization											12,038	14,236	10,692
Depreciation and amortization											(4,317)	(3,852)	(3,712)
Interest expense (Note 18)											(3,179)	(2,655)	(2,790)
Income tax expense (Note 25)											(1,604)	(1,415)	(774)
Earnings			(1,109)	$ 1,383	$ 607	$ 2,057	1,965	$ 814	$ 1,521	$ 2,014	2,938	6,314	3,416
Capital expenditures											4,690	7,885	5,470
Property, plant and equipment, net			104,460				100,067				104,460	100,067	94,571
Liquids Pipelines
Segmented Information
Impairment of goodwill (Note 16)											0
Gas Distribution and Storage
Segmented Information
Impairment of goodwill (Note 16)											0
Business Segments | Liquids Pipelines
Segmented Information
Revenues (Note 4)											12,052	10,581	10,423
Commodity and gas distribution costs											0	(25)	(20)
Operating and administrative											(4,287)	(3,431)	(3,331)
Impairment of long-lived assets											(245)
Impairment of goodwill (Note 16)											0
Income/(loss) from equity investments (Note 13)											785	759	558
Impairment of equity investments												0	0
Gain on joint venture merger transaction (Note 13)											0
Other income/(expense) (Note 28)											59	13	53
Earnings/(loss) before interest, income taxes and depreciation and amortization											8,364	7,897	7,683
Capital expenditures											1,418	4,051	2,033
Property, plant and equipment, net			53,567				52,530				53,567	52,530	48,799
Business Segments | Gas Transmission and Midstream
Segmented Information
Revenues (Note 4)											5,426	4,711	4,870
Commodity and gas distribution costs											0	0	0
Operating and administrative											(2,254)	(1,877)	(1,859)
Impairment of long-lived assets											0
Impairment of goodwill (Note 16)											(2,465)
Income/(loss) from equity investments (Note 13)											1,133	813	479
Impairment of equity investments												(111)	(2,351)
Gain on joint venture merger transaction (Note 13)											1,076
Other income/(expense) (Note 28)											210	135	(52)
Earnings/(loss) before interest, income taxes and depreciation and amortization											3,126	3,671	1,087
Capital expenditures											1,690	2,420	2,130
Property, plant and equipment, net			29,666				27,028				29,666	27,028	25,745
Business Segments | Gas Distribution and Storage
Segmented Information
Revenues (Note 4)											6,729	4,980	4,569
Commodity and gas distribution costs											(3,693)	(2,147)	(1,810)
Operating and administrative											(1,289)	(1,143)	(1,091)
Impairment of long-lived assets											0
Impairment of goodwill (Note 16)											0
Income/(loss) from equity investments (Note 13)											1	42	9
Impairment of equity investments												0	0
Gain on joint venture merger transaction (Note 13)											0
Other income/(expense) (Note 28)											79	385	71
Earnings/(loss) before interest, income taxes and depreciation and amortization											1,827	2,117	1,748
Capital expenditures											1,499	1,343	1,134
Property, plant and equipment, net			17,857				16,904				17,857	16,904	16,079
Business Segments | Renewable Power Generation
Segmented Information
Revenues (Note 4)											582	512	587
Commodity and gas distribution costs											(16)	0	(2)
Operating and administrative											(255)	(180)	(191)
Impairment of long-lived assets											(235)
Impairment of goodwill (Note 16)											0
Income/(loss) from equity investments (Note 13)											141	101	94
Impairment of equity investments												0	0
Gain on joint venture merger transaction (Note 13)											0
Other income/(expense) (Note 28)											45	75	35
Earnings/(loss) before interest, income taxes and depreciation and amortization											262	508	523
Capital expenditures											50	16	81
Property, plant and equipment, net			3,082				3,315				3,082	3,315	3,495
Business Segments | Energy Services
Segmented Information
Revenues (Note 4)											29,175	26,917	19,283
Commodity and gas distribution costs											(29,525)	(27,174)	(19,450)
Operating and administrative											(49)	(48)	(67)
Impairment of long-lived assets											(13)
Impairment of goodwill (Note 16)											0
Income/(loss) from equity investments (Note 13)											0	0	(3)
Impairment of equity investments												0	0
Gain on joint venture merger transaction (Note 13)											0
Other income/(expense) (Note 28)											(5)	(8)	1
Earnings/(loss) before interest, income taxes and depreciation and amortization											(417)	(313)	(236)
Capital expenditures											0	1	2
Property, plant and equipment, net			6				23				6	23	24
Eliminations and Other
Segmented Information
Revenues (Note 4)											(655)	(630)	(645)
Commodity and gas distribution costs											645	644	613
Operating and administrative											(85)	(33)	(210)
Impairment of long-lived assets											(48)
Impairment of goodwill (Note 16)											0
Income/(loss) from equity investments (Note 13)											(4)	(4)	(1)
Impairment of equity investments												0	0
Gain on joint venture merger transaction (Note 13)											0
Other income/(expense) (Note 28)											(977)	379	130
Earnings/(loss) before interest, income taxes and depreciation and amortization											(1,124)	356	(113)
Capital expenditures											33	54	90
Property, plant and equipment, net			$ 282				$ 267				$ 282	$ 267	$ 429