PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 134,000	$ 126,040
Total accumulated depreciation	(29,540)	(25,973)
Property, plant and equipment, net	$ 104,460	100,067
Pipelines
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	2.90%
Total property, plant and equipment	$ 66,528	62,997
Facilities and equipment
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	3.50%
Total property, plant and equipment	$ 37,028	34,331
Land and right-of-way
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	2.20%
Total property, plant and equipment	$ 3,637	3,320
Gas mains, services and other
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	2.60%
Total property, plant and equipment	$ 14,491	13,606
Storage
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	2.30%
Total property, plant and equipment	$ 3,477	3,099
Wind turbines, solar panels and other
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	4.10%
Total property, plant and equipment	$ 4,912	4,912
Other
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	8.50%
Total property, plant and equipment	$ 1,611	1,507
Under construction
Property, Plant and Equipment [Line Items]
Weighted Average Depreciation Rate (percent)	0.00%
Total property, plant and equipment	$ 2,316	$ 2,268