PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 169,066.0	$ 137,199.0
Total accumulated depreciation	(37,962.0)	(32,558.0)
Property, plant and equipment, net	$ 131,104.0	104,641.0
Pipelines
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	2.90%
Total property, plant and equipment	$ 73,633.0	66,698.0
Facilities and equipment
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	3.20%
Total property, plant and equipment	$ 43,439.0	37,634.0
Land and right-of-way
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	2.80%
Total property, plant and equipment	$ 4,181.0	3,600.0
Gas mains, services and other
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	3.00%
Total property, plant and equipment	$ 26,925.0	15,346.0
Storage
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	2.60%
Total property, plant and equipment	$ 6,455.0	4,929.0
Wind turbines, solar panels and other
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	3.90%
Total property, plant and equipment	$ 4,798.0	4,511.0
Other
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	8.60%
Total property, plant and equipment	$ 3,987.0	1,652.0
Under construction
Property, Plant and Equipment [Line Items]
Weighted average depreciation rate (as percent)	0.00%
Total property, plant and equipment	$ 5,648.0	2,829.0
Leased assets
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	5,300.0	5,100.0
Total accumulated depreciation	$ (2,300.0)	$ (2,100.0)