SEGMENTED INFORMATION (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segmented Information
Operating revenues	$ 15,097	$ 12,137
Commodity and gas distribution costs	(9,747)	(7,148)
Operating and administrative	(1,875)	(1,559)
Income from equity investments	491	395
Other income/(expense)	458	261
Earnings/(loss) before interest, income taxes, and depreciation and amortization	4,424	4,086
Depreciation and amortization	(1,055)	(932)
Interest expense	(719)	(657)
Income tax expense	(593)	(483)
Earnings	2,057	2,014
Capital expenditures	1,058	1,913
Eliminations and Other
Segmented Information
Operating revenues	(162)	(149)
Commodity and gas distribution costs	163	166
Operating and administrative	(37)	23
Income from equity investments	0	0
Other income/(expense)	391	180
Earnings/(loss) before interest, income taxes, and depreciation and amortization	355	220
Capital expenditures	12	12
Liquids Pipelines | Business segments
Segmented Information
Operating revenues	3,055	2,699
Commodity and gas distribution costs	(11)	(3)
Operating and administrative	(947)	(819)
Income from equity investments	215	154
Other income/(expense)	17	8
Earnings/(loss) before interest, income taxes, and depreciation and amortization	2,329	2,039
Capital expenditures	545	1,195
Gas Transmission and Midstream | Business segments
Segmented Information
Operating revenues	1,300	1,214
Commodity and gas distribution costs	0	0
Operating and administrative	(530)	(434)
Income from equity investments	221	182
Other income/(expense)	23	11
Earnings/(loss) before interest, income taxes, and depreciation and amortization	1,014	973
Capital expenditures	229	482
Gas Distribution and Storage | Business segments
Segmented Information
Operating revenues	2,411	1,823
Commodity and gas distribution costs	(1,468)	(958)
Operating and administrative	(299)	(272)
Income from equity investments	0	22
Other income/(expense)	21	19
Earnings/(loss) before interest, income taxes, and depreciation and amortization	665	634
Capital expenditures	266	219
Renewable Power Generation | Business segments
Segmented Information
Operating revenues	156	117
Commodity and gas distribution costs	(4)	0
Operating and administrative	(48)	(43)
Income from equity investments	55	37
Other income/(expense)	3	45
Earnings/(loss) before interest, income taxes, and depreciation and amortization	162	156
Capital expenditures	6	5
Energy Services | Business segments
Segmented Information
Operating revenues	8,337	6,433
Commodity and gas distribution costs	(8,427)	(6,353)
Operating and administrative	(14)	(14)
Income from equity investments	0	0
Other income/(expense)	3	(2)
Earnings/(loss) before interest, income taxes, and depreciation and amortization	(101)	64
Capital expenditures	$ 0	$ 0