SEGMENTED INFORMATION (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segmented Information
Operating revenues	$ 13,215	$ 10,948	$ 28,312	$ 23,085
Commodity and gas distribution costs	(8,637)	(6,719)	(18,384)	(13,867)
Operating and administrative	(1,994)	(1,484)	(3,869)	(3,043)
Income/(loss) from equity investments	510	352	1,001	747
Other income/(expense)	(499)	241	(41)	502
Earnings/(loss) before interest, income taxes, and depreciation and amortization	2,595	3,338	7,019	7,424
Depreciation and amortization	(1,064)	(929)	(2,119)	(1,861)
Interest expense	(791)	(618)	(1,510)	(1,275)
Income tax expense	(133)	(270)	(726)	(753)
Earnings	607	1,521	2,664	3,535
Capital expenditures	963	1,425	2,021	3,499
Eliminations and Other
Segmented Information
Operating revenues	(155)	(157)	(317)	(306)
Commodity and gas distribution costs	151	154	314	320
Operating and administrative	(128)	(99)	(165)	(76)
Income/(loss) from equity investments	(2)	0	(2)	0
Other income/(expense)	(570)	194	(179)	374
Earnings/(loss) before interest, income taxes, and depreciation and amortization	(704)	92	(349)	312
Capital expenditures	12	9	24	21
Liquids Pipelines | Business segments
Segmented Information
Operating revenues	2,638	2,547	5,693	5,246
Commodity and gas distribution costs	(16)	(7)	(27)	(10)
Operating and administrative	(976)	(673)	(1,923)	(1,492)
Income/(loss) from equity investments	153	180	368	334
Other income/(expense)	19	(3)	36	5
Earnings/(loss) before interest, income taxes, and depreciation and amortization	1,818	2,044	4,147	4,083
Capital expenditures	273	567	818	1,923
Gas Transmission and Midstream | Business segments
Segmented Information
Operating revenues	1,301	1,128	2,601	2,342
Commodity and gas distribution costs	0	0	0	0
Operating and administrative	(545)	(424)	(1,075)	(858)
Income/(loss) from equity investments	335	132	556	314
Other income/(expense)	28	32	51	43
Earnings/(loss) before interest, income taxes, and depreciation and amortization	1,119	868	2,133	1,841
Capital expenditures	333	547	562	1,029
Gas Distribution and Storage | Business segments
Segmented Information
Operating revenues	1,138	953	3,549	2,776
Commodity and gas distribution costs	(463)	(299)	(1,931)	(1,257)
Operating and administrative	(281)	(242)	(580)	(514)
Income/(loss) from equity investments	1	27	1	49
Other income/(expense)	22	19	43	38
Earnings/(loss) before interest, income taxes, and depreciation and amortization	417	458	1,082	1,092
Capital expenditures	334	300	600	519
Renewable Power Generation | Business segments
Segmented Information
Operating revenues	155	132	311	249
Commodity and gas distribution costs	(4)	0	(8)	0
Operating and administrative	(53)	(37)	(101)	(80)
Income/(loss) from equity investments	23	13	78	50
Other income/(expense)	1	7	4	52
Earnings/(loss) before interest, income taxes, and depreciation and amortization	122	115	284	271
Capital expenditures	11	2	17	7
Energy Services | Business segments
Segmented Information
Operating revenues	8,138	6,345	16,475	12,778
Commodity and gas distribution costs	(8,305)	(6,567)	(16,732)	(12,920)
Operating and administrative	(11)	(9)	(25)	(23)
Income/(loss) from equity investments	0	0	0	0
Other income/(expense)	1	(8)	4	(10)
Earnings/(loss) before interest, income taxes, and depreciation and amortization	(177)	(239)	(278)	(175)
Capital expenditures	$ 0	$ 0	$ 0	$ 0