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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment |
US$ MILLIONS | Gross carrying amount |  | Accumulated depreciation |  | Accumulated fair value adjustments |  | Total
Balance at January 1, 2020 | $ | 3,696 |  |  | $ | (567) |  |  | $ | 1,368 |  |  | $ | 4,497 |
Additions, net of disposals | 358 |  |  | 6 |  |  | — |  |  | 364 |
Non-cash additions | 6 |  |  | (3) |  |  | — |  |  | 3 |
Depreciation expense | — |  |  | (131) |  |  | — |  |  | (131) |
Fair value adjustments | — |  |  | — |  |  | 215 |  |  | 215 |
Net foreign currency exchange differences | 137 |  |  | (24) |  |  | 50 |  |  | 163 |
Balance at December 31, 2020 | $ | 4,197 |  |  | $ | (719) |  |  | $ | 1,633 |  |  | $ | 5,111 |
Additions, net of disposals | 367 |  |  | 10 |  |  | — |  |  | 377 |
Assets held by subsidiaries disposed during the period(1) | (599) |  |  | 163 |  |  | (217) |  |  | (653) |
Non-cash disposals | (1) |  |  | (3) |  |  | — |  |  | (4) |
Depreciation expense | — |  |  | (128) |  |  | — |  |  | (128) |
Fair value adjustments | — |  |  | — |  |  | 134 |  |  | 134 |
Net foreign currency exchange differences | (29) |  |  | 4 |  |  | (9) |  |  | (34) |
Balance at December 31, 2021 | $ | 3,935 |  |  | $ | (673) |  |  | $ | 1,541 |  |  | $ | 4,803 |
(1)See Note 4, Disposition of Businesses, for additional information. The following table summarizes the valuation techniques and significant inputs for our company’s property, plant and equipment assets.
Dec. 31, 2021 |  | Dec. 31, 2020
Valuation Technique |  | Discount Rate |  | Terminal Value Multiple |  | Investment Horizon |  | Valuation Technique |  | Discount Rate |  | Terminal Value Multiple |  | Investment Horizon
Discounted cash flow model |  | 7% |  | 20x |  | 10 yrs |  | Discounted cash flow model |  | 7% |  | 23x |  | 10 yrs

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