PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

	Weighted Average
December 31,	Depreciation Rate		2017		2016
(millions of Canadian dollars)
Pipeline	2.5	%	47,720		34,474
Pumping equipment, buildings, tanks and other	2.9	%	16,610		15,554
Land and right-of-way1	2.1	%	2,538		2,067
Gas mains, services and other	2.1	%	17,026		10,022
Compressors, meters and other operating equipment	2.1	%	5,774		4,014
Processing and treating plants	3.1	%	1,440		846
Storage	2.0	%	1,545		—
Wind turbines, solar panels and other	3.3	%	4,804		4,259
Power transmission	2.2	%	365		378
Vehicles, office furniture, equipment and other buildings and improvements	6.5	%	390		315
Under construction	—		7,601		6,966
Total property, plant and equipment2			105,813		78,895
Total accumulated depreciation			(15,102	)	(14,611	)
Property, plant and equipment, net			90,711		64,284

1 The measurement of weighted average depreciation rate excludes non-depreciable assets.

2 Certain assets were reclassified as held for sale as at December 31, 2017 (Note 7).