PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 137,199	$ 134,000
Total accumulated depreciation	(32,558)	(29,540)
Property, plant and equipment, net	$ 104,641	104,460
Pipelines
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	2.90%
Total property, plant and equipment	$ 66,698	66,528
Facilities and equipment
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	3.10%
Total property, plant and equipment	$ 37,634	37,028
Land and right-of-way
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	2.30%
Total property, plant and equipment	$ 3,600	3,637
Gas mains, services and other
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	2.60%
Total property, plant and equipment	$ 15,346	14,491
Storage
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	2.50%
Total property, plant and equipment	$ 4,929	3,477
Wind turbines, solar panels and other
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	4.10%
Total property, plant and equipment	$ 4,511	4,912
Other
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	10.10%
Total property, plant and equipment	$ 1,652	1,611
Under construction
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (percent)	0.00%
Total property, plant and equipment	$ 2,829	$ 2,316