PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2019

Property, plant and equipment [abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

($ millions)	Land and Land Rights		Pipelines		Facilities and Equipment		Cavern Storage and Other		Assets Under Construction		Total
Cost
Balance at December 31, 2017	329		6,650		6,715		1,223		659		15,576
Additions and transfers	12		531		469		231		291		1,534
Change in decommissioning provision	—		(10	)	5		19		—		14
Disposals and other	(1	)	(7	)	(30	)	5		(11	)	(44	)
Balance at December 31, 2018	340		7,164		7,159		1,478		939		17,080
Reclassification on adoption of IFRS 16 (Note 3)	—		—		—		(44	)	—		(44	)
Additions and transfers	32		215		691		203		534		1,675
Acquisition (Note 6)	86		1,434		798		314		28		2,660
Change in decommissioning provision	—		10		143		5		—		158
Foreign exchange adjustments	(2	)	(17	)	(4	)	—		(11	)	(34	)
Disposals and other	—		(3	)	(31	)	(12	)	3		(43	)
Balance at December 31, 2019	456		8,803		8,756		1,944		1,493		21,452
Depreciation
Balance at December 31, 2017	9		1,096		721		204		—		2,030
Depreciation	3		142		164		55		—		364
Disposals and other	—		(17	)	(18	)	(9	)	—		(44	)
Balance at December 31, 2018	12		1,221		867		250		—		2,350
Reclassification on adoption of IFRS 16 (Note 3)	—		—		—		(26	)	—		(26	)
Depreciation	4		155		174		59		—		392
Disposals and other	—		(13	)	(26	)	—		—		(39	)
Balance at December 31, 2019	16		1,363		1,015		283		—		2,677
Carrying amounts
Balance at December 31, 2018	328		5,943		6,292		1,228		939		14,730
Balance at December 31, 2019	440		7,440		7,741		1,661		1,493		18,775

Property, Plant and Equipment Under Construction

Costs of assets under construction at December 31, 2019 totaled $1.5 billion (2018: $939 million) including capitalized borrowing costs.

For the year ended December 31, 2019, included in additions and transfers are capitalized borrowing costs related to the construction of new pipelines or facilities amounting to $42 million (2018: $35 million), with capitalization rates ranging from 3.91 percent to 4.05 percent (2018: 3.86 percent to 4.01 percent).

Depreciation

Pipeline assets are depreciated using the straight line method over three to 75 years with the majority of assets depreciated over 40 years. Facilities and equipment are depreciated using the straight line method over three to 75 years with the majority of assets depreciated over 40 years. Cavern storage and other assets are depreciated using the straight line method over three to 40 years with the majority of assets depreciated over 40 years. These rates are established to depreciate remaining net book value over the shorter of their useful lives or economic lives.