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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2020
Property, plant and equipment [abstract]  
Disclosure of detailed information about property, plant and equipment
US$ MILLIONSGross carrying amountAccumulated depreciationAccumulated fair value adjustmentsTotal
Balance at January 1, 2019$3,141 $(437)$973 $3,677 
Change in accounting policies(1)
3 — — 3 
Additions, net of disposals413 7 — 420 
Depreciation expense— (113)— (113)
Fair value adjustments— — 347 347 
Net foreign currency exchange differences139 (24)48 163 
Balance at December 31, 2019$3,696 $(567)$1,368 $4,497 
Additions, net of disposals358 6 — 364 
Non-cash additions6 (3)— 3 
Depreciation expense— (131)— (131)
Fair value adjustments— — 215 215 
Net foreign currency exchange differences137 (24)50 163 
Balance at December 31, 2020$4,197 $(719)$1,633 $5,111 
(1)Relates to the adoption of IFRS 16 effective January 1, 2019.
The following table summarizes the valuation techniques and significant inputs for our company’s property, plant and equipment assets.
Dec. 31, 2020Dec. 31, 2019
Valuation
Technique		Discount
Rate		Terminal
Value
Multiple		Investment
Horizon		Valuation
Technique		Discount
Rate		Terminal
Value
Multiple		Investment
Horizon
Discounted cash flow model7% 
23x
 
10 yrs
Discounted cash flow model7% 
21x
 
10 yrs